BONUS TUTORIAL CISCO ASA 5505 CONFIGURATION WRITTEN BY: HARRIS ANDREA ALL YOU NEED TO KNOW TO CONFIGURE AND IMPLEMENT THE BEST FIREWALL IN THE MARKET

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1 BONUS TUTORIAL CISCO ASA 5505 CONFIGURATION ALL YOU NEED TO KNOW TO CONFIGURE AND IMPLEMENT THE BEST FIREWALL IN THE MARKET WRITTEN BY: HARRIS ANDREA MSC ELECTRICAL ENGINEERING AND COMPUTER SCIENCE CISCO CERTIFIED NETWORK PROFESSIONAL (CCNP) CISCO CERTIFIED SECURITY PROFESSIONAL (CCSP) 1

2 ABOUT THE AUTHOR: Harris Andrea is a Senior Network Security Engineer in a leading Internet Service Provider in Europe. He graduated from the University of Kansas USA in 1998 with a B.S and M.S degrees in Electrical Engineering and Computer Science. Since then, he has been working in the Networking field, designing, implementing and managing large scale networking projects with Cisco products and technologies. His main focus is on Network Security based on Cisco PIX/ASA Firewalls, Firewall Service Modules (FWSM) on 6500/7600 models, VPN products, IDS/IPS products, AAA services etc. To support his knowledge and to build a strong professional standing, Harris pursued and earned several Cisco Certifications such as CCNA, CCNP, and CCSP. He is also a technology blogger owing a networking blog about Cisco technologies which you can visit for extra technical information and tutorials. 2

3 You do not have resell rights or giveaway rights to this ebook. Only customers that have purchased this material are authorized to view it. This ebook contains material protected under International and Federal Copyright Laws and Treaties. No part of this publication may be transmitted or reproduced in any way without the prior written permission of the author. Violations of this copyright will be enforced to the full extent of the law. LEGAL NOTICE: The information services and resources provided in this ebook are based upon the current Internet environment as well as the author s experience. The techniques presented here have been proven to be successful. Because technologies are constantly changing, the configurations and examples presented in this ebook may change, cease or expand with time. We hope that the skills and knowledge acquired from this ebook will provide you with the ability to adapt to inevitable evolution of technological services. However, we cannot be held responsible for changes that may affect the applicability of these techniques. The opinions expressed in this ebook belong to the author and are not necessarily those of Cisco Systems, Inc. The author is not affiliated with Cisco Systems, Inc. All trademarks are trademarks of their respective owners. Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an editorial fashion only, and to the benefit of the trademark owner, with no intention of infringement of the trademark. Where such designations appear in this book, they have been printed with initial caps. All product names, logos and artwork are copyrights of their respective owners. None of the owners have sponsored or endorsed this publication. While all attempts have been made to verify information provided, the author assumes no responsibility for errors, omissions, or contrary interpretation of the subject matter herein. Any perceived slights of peoples or organizations are unintentional. The purchaser or reader of this publication assumes responsibility for the use of these materials and information. No guarantees of income are made. The author reserves the right to make changes and assumes no responsibility or liability whatsoever on behalf of any purchaser or reader of these materials. 3

4 TABLE OF CONTENTS About the Author:...2 Bonus Tutorial:...5 Cisco ASA 5505 Fundamentals...5 ASA 5505 Hardware and Licensing...5 ASA 5505 Default Configuration...8 ASA 5505 Configuration Examples Configuration Example 1: Internet Access With Dynamic Address From ISP Configuration Example 2: Dynamic Address From ISP With DMZ Web Server Configuration Example 3: Static Outside Address With DMZ Web and Servers Configuration Example 4: Cisco ASA 5505 With PPPoE Internet Access Configuration Example 5: Lan-to-Lan IPSEC VPN Between Cisco ASA Configuration Example 6: Remote Access IPSEC VPN on Cisco ASA

5 BONUS TUTORIAL: CISCO ASA 5505 FUNDAMENTALS This Tutorial is dedicated to the Cisco ASA 5505 firewall appliance which has some Hardware, Licensing and Configuration differences compared with the other models. The ASA 5505 provides a high-performance and flexible upgrade from the older PIX 501 and PIX 506E appliances and is designed for small offices or remote branches. Below we will describe the basic differences of the Cisco ASA 5505 compared with the other models and provide several configuration examples that cover most of the implementation scenarios that are usually found in real networks. The prerequisite of this Tutorial is to study first the Cisco ASA Firewall Fundamentals ebook so that you grasp the fundamental configuration concepts of Cisco ASA appliances. ASA 5505 HARDWARE AND LICENSING Hardware Ports and VLANs 1 Power 48VDC 2 SSC slot 3 Console Port 4 Lock Slot 5 Reset Button 6 USB 2.0 interfaces 7 Network Ports 0-5 (10/100) 8 Network Ports 6-7 (10/100 with Power over Ethernet) 5

6 Unlike the other Cisco ASA models, the ASA 5505 has a built-in 8-port 10/100 switch as shown on the figure above. Starting from right to left, we have Ethernet0/0 up to Ethernet0/7. The last two Ports 6 and 7 are also Power over Ethernet Ports (PoE), which means that in addition to normal computers, you can also connect IP Phones (or other PoE devices) which will be powered by the firewall PoE ports. The eight network interfaces of the ASA 5505 work only as Layer 2 ports, which is the difference of the 5505 from the other ASA models. This means that you cannot configure a Layer 3 IP address directly on each interface. Instead, you have to assign the interface port in a VLAN, and then configure all Firewall Interface parameters under the interface VLAN command. You can divide the eight physical ports into groups, called VLANs, that function as separate networks. This enables you to improve the security of your business because devices in different VLANs can only communicate with each other by passing the traffic through the firewall appliance where relevant security policies can be enforced. Devices in the same VLAN can communicate between them without Firewall control. Your license determines how many active VLANs you can have on the ASA The ASA 5505 comes preconfigured with two VLANs: VLAN1 and VLAN2. By default, Ethernet switch port 0 (Ethernet 0/0) is allocated to VLAN2. All other switch ports are allocated by default to VLAN1. The factory Default configuration of the network interfaces uses port Ethernet0/0 as the Outside untrusted interface (connecting to Internet), and the rest of the interfaces (0/1 to 0/7) are configured as the trusted Inside interfaces connecting to internal hosts. Two Switch Vlan Interfaces (SVI) exist by default (Interface Vlan 1 and Interface Vlan 2) which can be used to assign the Layer 3 IP addresses and other interface settings for the Outside zone (Ethernet 0/0) and for the Inside zone (Ethernet0/1 to 0/7). The default configuration of the Cisco ASA 5505 will be explained in the next section. 6

7 Licensing Although the ASA 5505 comes preconfigured with two VLANs, you can create as many as 20 VLANs, depending on your license. For example, you could create VLANs for the Inside, Outside, and DMZ network segments. There are two license options for the ASA 5505: Base License Security Plus License Base License With the Base License, you can configure up to 3 VLANs, thus segmenting your network into three security zones (Inside, Outside, DMZ). However there is a communication restriction between VLANs (zones). Communication between the DMZ VLAN and the Inside VLAN is restricted: the Inside VLAN is permitted to send traffic to the DMZ VLAN, but the DMZ VLAN is not permitted to send traffic to the Inside VLAN. Also, you cannot configure firewall failover redundancy with the Base License. These limitations are removed with the Security Plus license. To configure a DMZ VLAN on a Base License use the following commands: asa5505(config)# interface Vlan 3 asa5505(config-if)# no forward interface vlan 1 asa5505(config-if)# nameif DMZ asa5505(config-if)# security-level 50 asa5505(config-if)# ip address

8 asa5505(config)# interface Vlan 1 asa5505(config-if)# nameif inside asa5505(config-if)# security-level 100 asa5505(config-if)# ip address asa5505(config)# interface Vlan 2 asa5505(config-if)# nameif outside asa5505(config-if)# security-level 0 asa5505(config-if)# ip address Security Plus License This license removes all restrictions of the Base license. Up to 20 VLANs can be configured (ports can be configured as Trunk ports thus supporting multiple VLANs per port). Also there are no communication restrictions between VLANs. This license supports also Active/Standby (non stateful) firewall failover redundancy and Backup ISP Connectivity (Dual ISP connection). ASA 5505 DEFAULT CONFIGURATION The ASA 5505 is factory configured in such a way as to work right away out of the box. The Internet Outside Interface (Ethernet 0/0) is configured to obtain IP address automatically from the ISP, and the Inside Interfaces (Ethernet 0/1 to 0/7) are configured to provide IP addresses to internal hosts dynamically (DHCP). Specifically, the default ASA 5505 configuration includes the following: An inside VLAN 1 interface that includes the Ethernet 0/1 through 0/7 switch ports. The VLAN 1 IP address and mask are and An outside VLAN 2 interface that includes the Ethernet 0/0 switch port. VLAN 2 derives its IP address using DHCP (from the ISP). The default route is also derived from DHCP. All inside IP addresses are translated when accessing the outside using interface PAT. By default, inside users can access the outside, and outside users are prevented from accessing the inside. The DHCP server is enabled on the security appliance, so a PC connecting to the VLAN 1 interface receives an address between and The HTTP server is enabled for ASDM and is accessible to users on the network. Restore the default factory configuration using the configure factory-default command. 8

9 The Default Configuration consists of the following commands. interface Ethernet 0/0 switchport access vlan 2 This assigns Ethernet0/0 to Vlan 2 no shutdown interface Ethernet 0/1 switchport access vlan 1 This assigns Ethernet0/1 to Vlan 1 no shutdown interface Ethernet 0/2 switchport access vlan 1 no shutdown interface Ethernet 0/3 switchport access vlan 1 no shutdown interface Ethernet 0/4 switchport access vlan 1 no shutdown interface Ethernet 0/5 switchport access vlan 1 no shutdown interface Ethernet 0/6 switchport access vlan 1 no shutdown interface Ethernet 0/7 switchport access vlan 1 no shutdown interface vlan2 Configure all interface parameters under interface Vlan [number] nameif outside no shutdown ip address dhcp setroute interface vlan1 nameif inside ip address security-level 100 no shutdown global (outside) 1 interface nat (inside) http server enable 9

10 http inside dhcpd address inside dhcpd auto_config outside Obtain IP address dynamically from the ISP dhcpd enable inside Assign IP addresses dynamically to internal PCs logging asdm informational 10

11 ASA 5505 CONFIGURATION EXAMPLES CONFIGURATION EXAMPLE 1: INTERNET ACCESS WITH DYNAMIC ADDRESS FROM ISP In this scenario the 5505 is used for basic internet access using PAT, with a Dynamic IP address obtained from the ISP via DHCP (Firewall will act as DHCP client for the Outside interface). The Firewall will act also as a DHCP server for assigning IP addresses to inside hosts. Notice in this scenario that we don t need to configure a default route towards the ISP since the default route will be obtained automatically together with an IP address from the DHCP server of the ISP. The complete configuration follows below. See the Blue Color comments for clarifications. See also the Red Color commands for ASA version 8.3 and later. 11

12 ASA-5505# show run : Saved : hostname ASA-5505 domain-name test.com enable password xxxxxxxxxxxxxxxx encrypted names Vlan 1 is assigned by default to all ports Ethernet0/1 to 0/7 which belong to the inside zone. interface Vlan1 nameif inside security-level 100 ip address Vlan 2 is assigned to port Ethernet0/0 which belongs to the outside zone. interface Vlan2 nameif outside security-level 0 Get outside address and default gateway from ISP ip address dhcp setroute Assign Eth0/0 to vlan 2. interface Ethernet0/0 switchport access vlan 2 By default, Eth0/1 to 0/7 are assigned to vlan 1. No need to change anything. interface Ethernet0/1 interface Ethernet0/2 interface Ethernet0/3 interface Ethernet0/4 interface Ethernet0/5 interface Ethernet0/6 interface Ethernet0/7 passwd xxxxxxxxxxxxxxxxxx encrypted ftp mode passive dns server-group DefaultDNS domain-name test.com 12

13 Create an ACL on the outside that will allow only echo-reply for troubleshooting purposes. Use a deny all with log at the end to monitor any attacks coming from outside. access-list outside_in extended permit icmp any any echo-reply access-list outside_in extended deny ip any any log pager lines 24 logging asdm informational mtu inside 1500 mtu outside 1500 icmp unreachable rate-limit 1 burst-size 1 asdm image disk0:/asdm-523.bin no asdm history enable arp timeout Do PAT using the outside interface address global (outside) 1 interface Translate ALL inside addresses nat (inside) Commands Below are for version 8.3 object network internal_lan subnet nat (inside,outside) dynamic interface access-group outside_in in interface outside timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout uauth 0:05:00 absolute Configure Local authentication for firewall management (For accessing the Firewall you need to use the username/password configured later). aaa authentication serial console LOCAL aaa authentication telnet console LOCAL aaa authentication ssh console LOCAL no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart Allow internal hosts to telnet to the device telnet inside telnet timeout 5 Allow an external management host to ssh from outside for firewall management ssh outside ssh timeout 5 console timeout 0 dhcpd auto_config outside Assign a DNS server to internal hosts dhcpd dns Assign IP addresses to internal hosts dhcpd address inside dhcpd enable inside 13

14 class-map inspection_default match default-inspection-traffic policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect netbios inspect rsh inspect rtsp inspect skinny inspect esmtp inspect sqlnet inspect sunrpc inspect tftp inspect sip inspect xdmcp service-policy global_policy global Configure here the username and password for accessing the device username admin password xxxxxxxxxxxxxx encrypted prompt hostname context : end 14

15 CONFIGURATION EXAMPLE 2: DYNAMIC ADDRESS FROM ISP WITH DMZ WEB SERVER This is an extension scenario of the previous one. The Cisco ASA 5505 receives an outside IP address dynamically from the ISP and has three security zones (Inside, Outside, DMZ). The Inside zone network shall be able to access the Internet and DMZ, and also Internet hosts shall be able to access the DMZ Web Server. This scenario can work with both Base License and Security Plus License. However, with a Security Plus license the DMZ public server (whatever that be FTP, , Web etc) will be able to initiate traffic also to the Inside network zone (with the proper configuration). Since we have three security zones, we must create also three VLANs. VLAN1 (Inside) will be assigned to ports Ethernet0/2 up to 0/7, VLAN2 (Outside) will be assigned to port Ethernet 0/0, and VLAN3 (DMZ) will be assigned to Ethernet 0/1. The complete configuration follows below. See the Blue Color comments for clarifications. See also the Red Color commands for ASA version 8.3 and later. 15

16 ASA-5505# show run : Saved : hostname ASA-5505 domain-name test.com enable password xxxxxxxxxxxxxxxx encrypted names interface Vlan1 nameif inside security-level 100 ip address interface Vlan2 nameif outside security-level 0 Get outside address and default gateway from ISP ip address dhcp setroute interface Vlan3 Use the following command ONLY if you have a BASE LICENSE no forward interface vlan 1 nameif DMZ security-level 50 ip address Assign Eth0/0 to vlan 2. interface Ethernet0/0 switchport access vlan 2 Assign Eth0/1 to vlan 3. interface Ethernet0/1 switchport access vlan 3 The rest are by default assigned to vlan 1. No need to change anything. interface Ethernet0/2 interface Ethernet0/3 interface Ethernet0/4 interface Ethernet0/5 interface Ethernet0/6 interface Ethernet0/7 16

17 passwd xxxxxxxxxxxxxxxxxx encrypted ftp mode passive dns server-group DefaultDNS domain-name test.com Create an ACL on the outside that will allow access to the DMZ Web Server. Because the outside address is dynamic (unknown) we use any eq 80 for the destination address in the access list. access-list outside_in extended permit tcp any any eq 80 access-list outside_in extended deny ip any any log pager lines 24 logging asdm informational mtu inside 1500 mtu outside 1500 mtu DMZ 1500 icmp unreachable rate-limit 1 burst-size 1 asdm image disk0:/asdm-523.bin no asdm history enable arp timeout Do PAT on the outside interface global (outside) 1 interface Do PAT on the DMZ interface global (DMZ) 1 interface Translate ALL inside addresses when they access Outside or DMZ zones nat (inside) Commands below are for version 8.3 object network internal_lan subnet nat (inside,outside) dynamic interface Create a static redirection for port 80 towards the DMZ web server static (DMZ,outside) tcp interface netmask Commands below are for version 8.3 object network web_server_static host nat (DMZ,outside) static interface service tcp access-group outside_in in interface outside timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout uauth 0:05:00 absolute Configure Local authentication for firewall management (For accessing the Firewall you need to use the username/password configured later). aaa authentication serial console LOCAL aaa authentication telnet console LOCAL 17

18 aaa authentication ssh console LOCAL no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart Allow internal hosts to telnet to the device telnet inside telnet timeout 5 Allow an external management host to ssh from outside for firewall management ssh outside ssh timeout 5 console timeout 0 dhcpd auto_config outside Assign a DNS server to internal hosts dhcpd dns Assign IP addresses to internal hosts dhcpd address inside dhcpd enable inside class-map inspection_default match default-inspection-traffic policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect netbios inspect rsh inspect rtsp inspect skinny inspect esmtp inspect sqlnet inspect sunrpc inspect tftp inspect sip inspect xdmcp service-policy global_policy global Configure here the username and password for accessing the device username admin password xxxxxxxxxxxxxx encrypted prompt hostname context : end 18

19 CONFIGURATION EXAMPLE 3: STATIC OUTSIDE ADDRESS WITH DMZ WEB AND SERVERS This scenario requires a Security Plus License. We have a single static public address assigned to us ( ) which we will use with Port Redirection to access two DMZ public servers (Web and ). Any request from the Internet coming to port 80 will be redirected to (web server), and any request coming to port 25 will be redirected to ( Proxy Server). The Proxy Server will be sending any inbound received to the Internal Server. Similarly, all outgoing will be sent by the Internal server to the DMZ Proxy for outbound processing. We will use Static NAT to map the Inside network ( /24) towards the DMZ for bidirectional communication between the two zones. The complete configuration follows below. See the Blue Color comments for clarifications. See also the Red Color commands for ASA version 8.3 and later. 19

20 ASA-5505# show run : Saved : hostname ASA-5505 domain-name test.com enable password xxxxxxxxxxxxxxxx encrypted names interface Vlan1 nameif inside security-level 100 ip address interface Vlan2 nameif outside security-level 0 ip address interface Vlan3 nameif DMZ security-level 50 ip address Assign Eth0/0 to vlan 2. interface Ethernet0/0 switchport access vlan 2 Assign Eth0/1 to vlan 3. interface Ethernet0/1 switchport access vlan 3 The rest are by default assigned to vlan 1. No need to change anything. interface Ethernet0/2 interface Ethernet0/3 interface Ethernet0/4 interface Ethernet0/5 interface Ethernet0/6 interface Ethernet0/7 passwd xxxxxxxxxxxxxxxxxx encrypted ftp mode passive dns server-group DefaultDNS 20

21 domain-name test.com Create an ACL on the outside that will allow access to the DMZ Web and Servers. access-list outside_in extended permit tcp any host eq 80 access-list outside_in extended permit tcp any host eq 25 access-list outside_in extended deny ip any any log Commands below are for Version 8.3 and later access-list outside_in extended permit tcp any host eq 80 access-list outside_in extended permit tcp any host eq 25 access-list outside_in extended deny ip any any log Create an ACL on the DMZ that will allow access of the DMZ servers towards Inside and Outside The first entry below allows access only from Proxy to Internal access-list DMZ_in extended permit tcp host host eq 25 access-list DMZ_in extended deny ip access-list DMZ_in extended permit tcp host any eq 25 access-list DMZ_in extended permit udp host any eq domain Create an ACL on the Inside to allow Internet Access and also access of Internal to Proxy access-list inside_in extended permit tcp host host eq 25 access-list inside_in extended permit tcp host host eq 110 access-list inside_in extended permit tcp host eq 80 access-list inside_in extended deny ip access-list inside_in extended permit ip any pager lines 24 logging asdm informational mtu inside 1500 mtu outside 1500 mtu DMZ 1500 icmp unreachable rate-limit 1 burst-size 1 asdm image disk0:/asdm-523.bin no asdm history enable arp timeout Do PAT on the outside interface global (outside) 1 interface Translate ALL inside addresses when they access Outside nat (inside)

22 Commands below are for version 8.3 object network internal_lan subnet nat (inside,outside) dynamic interface Create static port redirections towards the DMZ web and servers static (DMZ,outside) tcp netmask static (DMZ,outside) tcp netmask Commands below are for version 8.3 object network web_server_static host nat (DMZ,outside) static service tcp object network _server_static host nat (DMZ,outside) static service tcp Create static NAT of inside network towards the DMZ static (inside,dmz) netmask Commands below are for version 8.3 object network inside_identity_nat subnet object network inside_to_dmz subnet nat (inside,dmz) static inside_identity_nat access-group outside_in in interface outside access-group DMZ_in in interface DMZ access-group inside_in in interface inside route outside timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout uauth 0:05:00 absolute Configure Local authentication for firewall management (For accessing the Firewall you need to use the username/password configured later). aaa authentication serial console LOCAL aaa authentication telnet console LOCAL aaa authentication ssh console LOCAL no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart Allow internal hosts to telnet to the device 22

23 telnet inside telnet timeout 5 Allow an external management host to ssh from outside for firewall management ssh outside ssh timeout 5 console timeout 0 dhcpd auto_config outside Assign a DNS server to internal hosts dhcpd dns Assign IP addresses to internal hosts dhcpd address inside dhcpd enable inside class-map inspection_default match default-inspection-traffic policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect netbios inspect rsh inspect rtsp inspect skinny inspect esmtp inspect sqlnet inspect sunrpc inspect tftp inspect sip inspect xdmcp service-policy global_policy global Configure here the username and password for accessing the device username admin password xxxxxxxxxxxxxx encrypted prompt hostname context : end 23

24 CONFIGURATION EXAMPLE 4: CISCO ASA 5505 WITH PPPOE INTERNET ACCESS For Broadband DSL or Cable access connectivity, many ISPs provide Point to Point over Ethernet (PPPoE) access, as will be described in this example scenario. If the ISP supplies you with a username/password for internet access, this means that you need to configure your ASA as PPPoE client. Most often, in this setup the ISP provides you also with a Modem which will bridge the DSL or Cable connectivity between the Customer Premises Equipment (ASA 5505 in our case) and the ISP equipment. In the following typical environment the ISP is providing Public IP address to the ASA via PPPoE. The complete configuration follows below. See the Blue Color comments for clarifications. See also the Red Color commands for ASA version 8.3 and later. 24

25 ASA-5505# show run : Saved : hostname ASA-5505 domain-name test.com enable password xxxxxxxxxxxxxxxx encrypted names Vlan 1 is assigned by default to all ports Ethernet0/1 to 0/7 which belong to the inside zone. interface Vlan1 nameif inside security-level 100 ip address Vlan 2 is assigned to port Ethernet0/0 which belongs to the outside zone. interface Vlan2 nameif outside security-level 0 Configure this VLAN as PPPoE Client and associate the pppoe group ATT pppoe client vpdn group ATT ip address pppoe setroute Assign Eth0/0 to vlan 2. interface Ethernet0/0 switchport access vlan 2 By default, Eth0/1 to 0/7 are assigned to vlan 1. No need to change anything. interface Ethernet0/1 interface Ethernet0/2 interface Ethernet0/3 interface Ethernet0/4 interface Ethernet0/5 interface Ethernet0/6 interface Ethernet0/7 passwd xxxxxxxxxxxxxxxxxx encrypted ftp mode passive dns server-group DefaultDNS domain-name test.com 25

26 Create an ACL on the outside that will allow only echo-reply for troubleshooting purposes. Use a deny all with log at the end to monitor any attacks coming from outside. access-list outside_in extended permit icmp any any echo-reply access-list outside_in extended deny ip any any log pager lines 24 logging asdm informational mtu inside 1500 Configure the outside MTU as 1492 since there is an extra 8-byte overhead for PPPoE mtu outside 1492 icmp unreachable rate-limit 1 burst-size 1 asdm image disk0:/asdm-523.bin no asdm history enable arp timeout Do PAT using the outside interface address global (outside) 1 interface Translate ALL inside addresses nat (inside) Commands below are for version 8.3 object network internal_lan subnet nat (inside,outside) dynamic interface access-group outside_in in interface outside timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout uauth 0:05:00 absolute Configure Local authentication for firewall management (For accessing the Firewall you need to use the username/password configured later). aaa authentication serial console LOCAL aaa authentication telnet console LOCAL aaa authentication ssh console LOCAL no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart Allow internal hosts to telnet to the device telnet inside telnet timeout 5 Allow an external management host to ssh from outside for firewall management ssh outside ssh timeout 5 console timeout 0 Next create the ATT pppoe group with the ISP connection details vpdn group ATT request dialout pppoe vpdn group ATT localname [ENTER ISP USERNAME HERE] vpdn group ATT ppp authentication chap [or PAP, depends on your ISP settings] vpdn username [ENTER ISP USERNAME HERE] password [ENTER ISP PASSWORD HERE] 26

27 dhcpd auto_config outside Assign a DNS server to internal hosts dhcpd dns Assign IP addresses to internal hosts dhcpd address inside dhcpd enable inside class-map inspection_default match default-inspection-traffic policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect netbios inspect rsh inspect rtsp inspect skinny inspect esmtp inspect sqlnet inspect sunrpc inspect tftp inspect sip inspect xdmcp service-policy global_policy global Configure here the username and password for accessing the device username admin password xxxxxxxxxxxxxx encrypted prompt hostname context : end 27

28 CONFIGURATION EXAMPLE 5: LAN-TO-LAN IPSEC VPN BETWEEN CISCO ASA 5505 Site-to-Site IPSEc VPN is sometimes called LAN-to-LAN VPN. As the name implies, this VPN type connects together two distant LAN networks over the Internet. Usually, Local Area Networks use private addressing as shown on our diagram below. Without VPN connectivity, the two LAN networks below (LAN-1 and LAN-2) wouldn t be able to communicate. By configuring a Lan-to-Lan IPSEc VPN between the two ASA 5505 firewalls, we can establish a secure tunnel over the Internet, and pass our private LAN traffic inside this tunnel. The result is that hosts in network /24 can now directly access hosts in /24 network (and vice-versa) as if they are located in the same LAN. The IPSEc tunnel is established between the Public IP addresses of the firewalls ( and ). The ASA 5505 supports maximum 10 Lan-to-Lan IPSEc sessions with the Base License and 25 IPSEc sessions with the Security Plus license. The complete configuration follows below. See the Blue Color comments for clarifications. See also the Red Color commands for ASA version 8.3 and later. 28

29 ASA-1 CONFIGURATION ASA-1# show run : Saved : hostname ASA-1 domain-name test.com enable password xxxxxxxxxxxxxx encrypted names interface Vlan1 nameif inside security-level 100 ip address interface Vlan2 nameif outside security-level 0 ip address interface Ethernet0/0 switchport access vlan 2 interface Ethernet0/1 interface Ethernet0/2 interface Ethernet0/3 interface Ethernet0/4 interface Ethernet0/5 interface Ethernet0/6 interface Ethernet0/7 passwd xxxxxxxxxxxxxxxx encrypted ftp mode passive dns server-group DefaultDNS domain-name test.com Select Interesting Traffic to be encrypted access-list VPN-TO-ASA2 extended permit ip Select which traffic must be excluded from NAT. access-list NONAT extended permit ip access-list OUTSIDE_IN extended permit icmp any any echo-reply 29

30 access-list OUTSIDE_IN extended deny ip any any log pager lines 24 logging asdm informational mtu inside 1500 mtu outside 1500 icmp unreachable rate-limit 1 burst-size 1 asdm image disk0:/asdm-523.bin no asdm history enable arp timeout global (outside) 1 interface Do not translate Interesting Traffic nat (inside) 0 access-list NONAT nat (inside) Commands below are for version 8.3 object network internal_lan subnet nat (inside,outside) dynamic interface object network obj-local subnet object network obj-remote subnet nat (inside,outside) 1 source static obj-local obj-local destination static obj-remote objremote access-group OUTSIDE_IN in interface outside route outside timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout uauth 0:05:00 absolute aaa authentication serial console LOCAL aaa authentication telnet console LOCAL aaa authentication ssh console LOCAL no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart Create a Phase 2 transform set for encryption and authentication protocols. crypto ipsec transform-set espsha3desproto esp-3des esp-sha-hmac Create a crypto map for the IPSEC VPN with the ASA-2 firewall crypto map IPSEC 10 match address VPN-TO-ASA2 crypto map IPSEC 10 set peer crypto map IPSEC 10 set transform-set espsha3desproto Attach the crypto map to the outside interface crypto map IPSEC interface outside 30

31 crypto isakmp identity address Enable also the Phase 1 isakmp to the outside interface crypto isakmp enable outside Create the Phase 1 isakmp policy crypto isakmp policy 10 authentication pre-share encryption 3des hash sha group 2 lifetime telnet inside telnet timeout 5 ssh timeout 5 console timeout 0 class-map inspection_default match default-inspection-traffic policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect rsh inspect rtsp inspect sqlnet inspect skinny inspect sunrpc inspect xdmcp inspect sip inspect netbios inspect tftp inspect pptp service-policy global_policy global username admin password xxxxxxxxxxxxxxx encrypted Create a tunnel group for the IPSEC VPN tunnel-group type ipsec-l2l tunnel-group ipsec-attributes pre-shared-key LANtoLANvpnkey isakmp keepalive threshold 30 retry 5 prompt hostname context : end 31

32 ASA-2 CONFIGURATION ASA-2# show run : Saved : hostname ASA-2 domain-name test.com enable password xxxxxxxxxxxxxx encrypted names interface Vlan1 nameif inside security-level 100 ip address interface Vlan2 nameif outside security-level 0 ip address interface Ethernet0/0 switchport access vlan 2 interface Ethernet0/1 interface Ethernet0/2 interface Ethernet0/3 interface Ethernet0/4 interface Ethernet0/5 interface Ethernet0/6 interface Ethernet0/7 passwd xxxxxxxxxxxxxxxx encrypted ftp mode passive dns server-group DefaultDNS domain-name test.com Select Interesting Traffic to be encrypted access-list VPN-TO-ASA1 extended permit ip Select which traffic must be excluded from NAT. access-list NONAT extended permit ip access-list OUTSIDE_IN extended permit icmp any any echo-reply 32

33 access-list OUTSIDE_IN extended deny ip any any log pager lines 24 logging asdm informational mtu inside 1500 mtu outside 1500 icmp unreachable rate-limit 1 burst-size 1 asdm image disk0:/asdm-523.bin no asdm history enable arp timeout global (outside) 1 interface Do not translate Interesting Traffic nat (inside) 0 access-list NONAT nat (inside) Commands below are for version 8.3 object network internal_lan subnet nat (inside,outside) dynamic interface object network obj-local subnet object network obj-remote subnet nat (inside,outside) 1 source static obj-local obj-local destination static obj-remote objremote access-group OUTSIDE_IN in interface outside route outside timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout uauth 0:05:00 absolute aaa authentication serial console LOCAL aaa authentication telnet console LOCAL aaa authentication ssh console LOCAL no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart Create a Phase 2 transform set for encryption and authentication protocols. crypto ipsec transform-set espsha3desproto esp-3des esp-sha-hmac Create a crypto map for the IPSEC VPN with the ASA-1 firewall crypto map IPSEC 10 match address VPN-TO-ASA1 crypto map IPSEC 10 set peer crypto map IPSEC 10 set transform-set espsha3desproto Attach the crypto map to the outside interface 33

34 crypto map IPSEC interface outside crypto isakmp identity address Enable also the Phase 1 isakmp to the outside interface crypto isakmp enable outside Create the Phase 1 isakmp policy crypto isakmp policy 10 authentication pre-share encryption 3des hash sha group 2 lifetime telnet inside telnet timeout 5 ssh timeout 5 console timeout 0 class-map inspection_default match default-inspection-traffic policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect rsh inspect rtsp inspect sqlnet inspect skinny inspect sunrpc inspect xdmcp inspect sip inspect netbios inspect tftp inspect pptp service-policy global_policy global username admin password xxxxxxxxxxxxxxx encrypted Create a tunnel group for the IPSEC VPN tunnel-group type ipsec-l2l tunnel-group ipsec-attributes pre-shared-key LANtoLANvpnkey isakmp keepalive threshold 30 retry 5 prompt hostname context : end 34

35 CONFIGURATION EXAMPLE 6: REMOTE ACCESS IPSEC VPN ON CISCO ASA 5505 We will configure here a Remote Access VPN scenario for providing secure connectivity to remote users over the Internet. Moreover, in this configuration example we will setup the splittunneling feature which allows remote users to browse the Internet while connected with the IPSEC VPN. Because split-tunneling is not considered safe, it is disabled by default. This means that once the remote users initiate a Remote Access VPN with the central site, they can ONLY access the Corporate LAN network and nothing else. In order for the users to simultaneously access Internet resources and the Corporate LAN, then split-tunneling must be configured. The remote teleworker user must have a Cisco VPN client software installed on his/her computer in order to establish the VPN session. Once the VPN is established, the ASA 5505 will assign a private IP address from pool to the remote user. This will allow the remote user to have full network connectivity with the internal corporate LAN ( /24). The complete configuration follows below. See the Blue Color comments for clarifications. See also the Red Color commands for ASA version 8.3 and later. 35

36 ASA-1# show run : Saved : hostname ASA-1 domain-name test.com enable password xxxxxxxxxxxxxx encrypted names interface Vlan1 nameif inside security-level 100 ip address interface Vlan2 nameif outside security-level 0 ip address interface Ethernet0/0 switchport access vlan 2 interface Ethernet0/1 interface Ethernet0/2 interface Ethernet0/3 interface Ethernet0/4 interface Ethernet0/5 interface Ethernet0/6 interface Ethernet0/7 passwd xxxxxxxxxxxxxxxxxxxxx encrypted ftp mode passive dns server-group DefaultDNS domain-name test.com access-list outside-in extended permit icmp any any echo-reply access-list outside-in extended deny ip any any log 36

37 Traffic between internal LAN and Remote Access clients must not be translated access-list nat0_acl extended permit ip Remote Access client traffic destined to the internal LAN is permitted for split tunneling (i.e to access the Internet simultaneously) access-list splittunnel standard permit pager lines 24 logging enable logging trap debugging mtu outside 1500 mtu inside 1500 Create a pool of addresses to assign for the remote access clients ip local pool vpnpool icmp unreachable rate-limit 1 burst-size 1 no asdm history enable arp timeout global (outside) 1 interface nat (inside) 0 access-list nat0_acl nat (inside) Commands below are for version 8.3 object network internal_lan subnet nat (inside,outside) dynamic interface object network obj-vpnpool subnet nat (inside,outside) 1 source static any any destination static obj-vpnpool obj-vpnpool access-group outside-in in interface outside route outside timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout uauth 0:05:00 absolute aaa authentication ssh console LOCAL aaa authentication serial console LOCAL aaa authentication telnet console LOCAL no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac 37

38 Create a dynamic crypto map for the remote VPN clients crypto dynamic-map outside_dyn_map 20 set transform-set ESP-3DES-MD5 Attach the dynamic crypto map to a static crypto map crypto map outside_map ipsec-isakmp dynamic outside_dyn_map crypto map outside_map interface outside Create a Phase 1 isakmp policy for the remote VPN clients crypto isakmp enable outside crypto isakmp policy 20 authentication pre-share encryption 3des hash md5 group 2 lifetime nat-traversal allows remote clients behind a NAT device to connect without problems. crypto isakmp nat-traversal 20 telnet inside telnet timeout 5 console timeout 0 class-map inspection_default match default-inspection-traffic policy-map type inspect dns migrated_dns_map_1 parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns migrated_dns_map_1 inspect ftp inspect h323 h225 inspect h323 ras inspect netbios inspect rsh inspect rtsp inspect skinny inspect esmtp inspect sqlnet inspect sunrpc inspect tftp inspect sip inspect xdmcp service-policy global_policy global Configure a group-policy and associate the split tunnel network list configured before group-policy remotevpn internal 38

39 group-policy remotevpn attributes vpn-idle-timeout 30 split-tunnel-policy tunnelspecified split-tunnel-network-list value splittunnel username admin password xxxxxxxxxxxxxxxxxxxx encrypted Create a tunnel group with type ipsec-ra and associate the vpn pool configured before tunnel-group remotevpn type ipsec-ra tunnel-group remotevpn general-attributes address-pool vpnpool default-group-policy remotevpn The group name remotevpn and the pre-shared-key value must be configured also on the Cisco VPN client software tunnel-group remotevpn ipsec-attributes pre-shared-key some-strong-key-here prompt hostname context : end 39

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