Configuring Triple Play Security with CLI
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1 Triple Play Service Delivery Architecture Configuring Triple Play Security with CLI xvpls This section provides information to configure Residential Broadband Aggregation services using the command line interface. It is assumed that the reader is familiar with VPLS, IES and VPRN services. Topics in this section include: Common Configuration Tasks on page 662 Configuring Anti-Spoofing Filters on page 662 Configuring Triple Play Security features on page 663 Configuring ARP Handling on page 669 Configuring Web Portal Redirect on page SR OS Triple Play Guide Page 661
2 Configuring Triple Play Security with CLI Common Configuration Tasks Topics in this section are: Configuring Anti-Spoofing Filters on page 662 Configuring Triple Play Security features on page 663 Configuring MAC Pinning on page 663 Configuring MAC Protection on page 664 Configuring VPLS Redirect Policy on page 666 Configuring VPLS Redirect Policy on page 666 Configuring ARP Handling on page 669 Configuring Web Portal Redirect on page 675 Configuring Anti-Spoofing Filters Anti-spoofing filters are used to prevent malicious subscribers sending IP packets with a forged IP or MAC address, and thus mis-directing traffic. The anti-spoofing filter is populated from the DHCP lease state table, and DHCP snooping must be enabled on the SAP. There are three types of filters (MAC, IP and IP+MAC), one type is allowed per SAP. The following displays an IES service interface configuration with anti-spoofing. A:ALA-48>config>service>ies# info interface "test123" create address /24 local-proxy-arp proxy-arp policy-statement "ProxyARP" sap 1/1/7:0 create anti-spoof ip arp-populate dhcp lease-populate 1 A:ALA-48>config>service>ies# Page SR OS Triple Play Guide
3 Triple Play Service Delivery Architecture Configuring Triple Play Security features Topics in this section are: Configuring MAC Pinning on page 663 Configuring MAC Protection on page 664 Configuring VPLS Redirect Policy on page 666 Configuring VPLS Redirect Policy on page 666 Configuring MAC Pinning The following example displays a partial BSA configuration with MAC pinning enabled on a SAP: A:ALA-48>config>service# info vpls 800 customer 6001 create description "VPLS with residential split horizon for DSL" stp shutdown sap 2/1/4:100 split-horizon-group "DSL-group2" create description "SAP for RSHG" mac-pinning A:ALA-48>config>service# 7750 SR OS Triple Play Guide Page 663
4 Configuring Triple Play Security with CLI Configuring MAC Protection Preventing Access By Residential Subscribers Using Protected (Gateway) MAC Addresses The first step is to create a list of MAC addresses to be protected, the second step is to prevent access using these source addresses inside an SHG or a SAP. The following example displays a partial BSA configuration with some protected MAC addresses on any SAP created inside the SHG: A:ALA-48>config>service# info vpls 800 customer 6001 create split-horizon-group "mygroup" create restrict-protected-src description "VPLS with residential split horizon for DSL" mac-protect mac 00:00:17:FE:82:D8 mac 93:33:00:00:BF:92 A:ALA-48>config>service# Page SR OS Triple Play Guide
5 Triple Play Service Delivery Architecture Restricting Access By Residential Subscribers To a Small List Of Upstream MAC Addresses: The first step is to create a list of MAC addresses to be protected, the second step is to restrict access to these addresses only from an SHG or a SAP. (If the MAC address of an upstream server is not known, it can be discovered using e.g. the cpe-ping OAM tool.) The following example displays a partial BSA configuration with restricted access to some MAC addresses from a specified SAP (an unrestricted access from any other SAP within the VPLS): A:ALA-48>config>service# info vpls 800 customer 6001 create description "VPLS with restricted access on a SAP" mac-protect mac 00:00:17:FE:82:D8 mac 93:33:00:00:BF:92 sap 1/1/4:30 create restrict-unprotected-dst A:ALA-48>config>service# 7750 SR OS Triple Play Guide Page 665
6 Configuring Triple Play Security with CLI Configuring VPLS Redirect Policy Creating the Filter on page 667 Applying the Filter to a VPLS Service on page 668 Figure 40 displays an IP filter entry configuration for VPLS redirect policy. Alcatel BSA To DSLAM Alcatel BSA To DSLAM To BSR VPLS 10 To BSR VPLS 10 FSAP F SDP SDP 1/2/3:100 1/2/3:100 Customer Customer 1 SDP SDP 100:10 100:10 DSCP-0 DSCP-0 DSCP-0 DSCP-0 SAP SAP SAP SAP 1/1/1:100 1/1/1:100 1/1/2:100 1/1/2:100 DPI DPI OSSG083A OSSG083A Figure 40: VPLS Redirect Policy Example Information about defining and applying IP and MAC filters is described in the7750 SR OS Router Configuration Guide. Page SR OS Triple Play Guide
7 Triple Play Service Delivery Architecture Creating the Filter The following displays a redirect filter entry: A:ALA-A>config>filter# info ip-filter 10 default-action forward entry 10 match dscp be action forward next-hop sap 1/1/1:100 ip-filter 11 default-action forward entry 10 match dscp be dscp be action forward next-hop sap 1/1/2: A:ALA-A>config>filter# 7750 SR OS Triple Play Guide Page 667
8 Configuring Triple Play Security with CLI Applying the Filter to a VPLS Service The following displays how the redirection filter configured above is assigned to the ingress SAP from the DSLAM, and the ingress SDP from the BSR: A:ALA-A>config>service>vpls# info vpls 10 customer 1 create description vpls10 sap 1/2/3:100 create ingress ip filter 10 sap 1/1/1:100 create sap 1/1/2:100 create mesh-sdp 100:10 create ingress ip filter 11 A:ALA-A>config>service>vpls# Page SR OS Triple Play Guide
9 Triple Play Service Delivery Architecture Configuring ARP Handling Topics in this section are: Configuring Proxy ARP on page 669 Configuring Local Proxy ARP on page 670 Configuring ARP Reply Agent in a VPLS Service on page 671 Configuring Automatic ARP Table Population in an IES or VPRN Interface on page 673 Configuring Proxy ARP The implementation of proxy ARP with support for local proxy ARP allows the 7750 SR to respond to ARP requests in the subnet assigned to an IES or VPRN interface. Configuring this command will allow multiple customers to share the same IP subnet. The following example displays an IES proxy ARP configuration: A:ALA-48>config>service>ies# info interface "test123" create address /24 local-proxy-arp proxy-arp-policy "ProxyARP" A:ALA-48>config>service>ies# 7750 SR OS Triple Play Guide Page 669
10 Configuring Triple Play Security with CLI Configuring Local Proxy ARP When local proxy ARP is enabled on an IP interface, the 7750 SR responds to all ARP requests for IP addresses belonging to the subnet with it's own MAC address, and forwards all traffic between hosts in that subnet. Local proxy ARP is disabled by default. Note: When local-proxy-arp is enabled under a IES or VPRN service, all ICMP redirects on the ports associated with the service are automatically blocked. This prevents users from learning each other's MAC address (from ICMP redirects). The following example displays a local proxy ARP IES configuration: A:ALA-A>config>service>ies# info interface "test" create shutdown address /24 local-proxy-arp A:ALA-A>config>service>ies# Page SR OS Triple Play Guide
11 Triple Play Service Delivery Architecture Configuring ARP Reply Agent in a VPLS Service When ARP reply agent is enabled, the 7750 SR will respond to ARP requests from the network, with information from the DHCP lease state table. In the upstream direction (towards the network), the ARP reply agent intercepts ARP requests on subscriber SAPs, and checks them against the DHCP lease state table. The purpose is to prevent a malicious subscriber spoofing ARP request or ARP reply messages and thus populating the upstream router's ARP table with incorrect entries. The following example displays a partial BSA configuration with ARP Reply Agent enabled on a SAP: A:ALA-48>config>service# info... vpls 800 customer 6001 create description "VPLS with ARP Reply Agent active" sap 2/1/4:100 split-horizon-group "DSL-group2" create arp-reply-agent sub-ident sap 3/1/4:200 split-horizon-group "DSL-group2" create arp-reply-agent sub-ident... A:ALA-48>config>service# 7750 SR OS Triple Play Guide Page 671
12 Configuring Triple Play Security with CLI Configuring Remote Proxy ARP The following example displays the IES configuration to enable remote proxy ARP: A:ALA-49>config>service>ies# info interface "test-1a" create address /24 remote-proxy-arp A:ALA-49>config>service>ies# Page SR OS Triple Play Guide
13 Triple Play Service Delivery Architecture Configuring Automatic ARP Table Population in an IES or VPRN Interface The following example displays the IES DHCP configuration to enable automatic population of the ARP table using snooped DHCP information on an IES or VPRN interface: A:ALA-1>config>service>ies>if# info arp-populate dhcp description "snooping_only" lease-populate 1 A:ALA-1>config>service>ies>if# A:ALA-1>config>service>vprn>if# info dhcp description "test" lease-populate 1 A:ALA-1>config>service>ies>if# 7750 SR OS Triple Play Guide Page 673
14 Configuring Triple Play Security with CLI Configuring CPU Protection CPU Protection can be used to protect the SR OS router in subscriber management scenarios. Refer to the SR OS System Management Guide for information about CPU Protection operation and configuration. Page SR OS Triple Play Guide
15 Triple Play Service Delivery Architecture Configuring Web Portal Redirect The generic CLI structure for defining and applying IP and MAC filters is described in the 7750 SR OS Router Configuration Guide. The following example displays an IP filter entry configuration for web-portal redirect: A:ALA-A>config>filter# info ip-filter 10 create description filter to forward DNS and web traffic to my portal; redirect all other web traffic to the portal and drop everything else default-action drop entry 10 create description allows DNS traffic match protocol 17 dst-port 53 action forward entry 20 create description allows web traffic destined to portal (IP address ) match protocol 6 dst-port eq 80 dst-ip action forward entry 30 description redirects all web traffic to portal match protocol 6 dst-port eq 80 action http-redirect /login.cgi?ip=$ip&mac=$mac&orig_url=$url&usb=$sub A:ALA-A>config>filter# 7750 SR OS Triple Play Guide Page 675
16 Configuring Triple Play Security with CLI Filter entry 10 in the example output allows the customer to access DNS to get the IP address of the original website they are trying to view. Entry 20 allows HTTP packets destined to the captive portal itself to be forwarded. Note that the actual IP address (a.b.c.d) needs to be entered, not the DNS name ( ). The IP address can be easily resolved from the 7750 SR CLI using the ping command. Entry 30 (which is the last option that does not drop the customer packets) checks for HTTP protocol and then starts the redirection process: The 7750 SR will intercept the HTTP GET from the subscriber and respond with an HTTP 302 (temporarily moved) with the URL configured in the filter entry. This URL can contain some variables, notably the customer IP and MAC addresses to allow the portal to create an entry for the customer. The original requested URL is also included to redirect the client site back to the original requested site when the process is done. The client will then close the connection with the original IP address and open a connection to the redirected server. Entry 20 will allow this connection. The following displays how the redirection filter configured above is assigned to an ingress SAP: A:ALA-A>config>service>vpls# info vpls 3 customer 6 create description "VPLS with web portal redirection filter applied" sap 2/1/5:0 create ingress filter ip 10 A:ALA-A>config>service>vpls# Page SR OS Triple Play Guide
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