Table of Contents. Cisco Configuring CET Encryption with a GRE Tunnel
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1 Table of Contents Configuring CET Encryption with a GRE Tunnel...1 Document ID: Cisco has announced the end of life for the Cisco Encryption Technology. For more information, please see the End of Sales Announcement...1 Introduction...1 Prerequisites...1 Requirements...1 Components Used...1 Conventions...1 Configure...1 Network Diagram...2 Configurations...2 Verify...4 Troubleshoot...4 NetPro Discussion Forums Featured Conversations...4 Related Information...4 i
2 Configuring CET Encryption with a GRE Tunnel Document ID: Cisco has announced the end of life for the Cisco Encryption Technology. For more information, please see the End of Sales Announcement. Introduction Prerequisites Requirements Components Used Conventions Configure Network Diagram Configurations Verify Troubleshoot NetPro Discussion Forums Featured Conversations Related Information Introduction To configure Cisco Encryption Technology (CET) encryption with a tunnel, you must configure encryption on the tunnel's interface. Additionally, you must configure encryption on the physical interface that heads toward the tunnel's eventual destination. Note: CET encryption is now end of life. IPSec is the recommended encryption scheme for migration. Prerequisites Requirements There are no specific requirements for this document. Components Used This document is not restricted to specific software and hardware versions. Conventions For more information on document conventions, refer to Cisco Technical Tips Conventions. Configure In this section, you are presented with the information to configure the features described in this document.
3 Note: To find additional information on the commands used in this document, use the Command Lookup Tool ( registered customers only). Network Diagram This document uses this network setup: Network Diagram Notes , behind r3 4k, and , behind R6 2500, are end stations. When they ping each other, the traffic goes through the tunnel. The generic routing encapsulation (GRE) tunnel is configured with loopback interfaces as the tunnel source and destination. Traffic through the tunnel is also encrypted. The implementation of this feature requires that to encrypt tunnel traffic, the crypto map must be attached to both the tunnel interface and the physical outbound interface. Configurations This document uses these configurations: r3 4k R1 AGS R r3 4k hostname r3 4k crypto public key r F3681B5D 32372A19 0C0CCC4B E707F829 D882CF30 A9B4DBE3 E1911E9C F6A9E DF A20FEFAD 2ACC400E 8DDB10B1 3566FA3A E55A9BBE 00916AAD 20A0C75C quit 10 set algorithm 40 bit des set peer r match address 128 interface Loopback0 ip address interface Tunnel0 ip address tunnel source Loopback0 tunnel destination interface Ethernet0 ip address
4 description inside interface media type 10BaseT interface Serial0 encapsulation frame relay no ip route cache interface Serial0.1 point to point description outside interface ip address frame relay interface dlci 100 ip classless ip route ip route access list 128 permit gre host host R1 AGS hostname R1 AGS interface Ethernet0 ip address interface Serial1 ip address ip classless ip route ip route R hostname R crypto public key r3 4k 04D6265A 512A7D84 43C348B7 959D2FE2 3122B285 FDA2A A835 84D03134 DB160DE1 27CA2D24 D6C23EFE 3BE25A95 D62EA30B 0F2C3BA8 9AB6DB82 D AC987 quit 10 set algorithm 40 bit des set peer r3 4k match address 128 interface Loopback0 ip address interface Tunnel0 ip address tunnel source Loopback0 tunnel destination interface Ethernet 0 description inside interface ip address
5 interface Serial0 description outside interface ip address ip classless ip route ip route ip route access list 128 permit gre host host Verify There is currently no verification procedure available for this configuration. Troubleshoot There is currently no specific troubleshooting information available for this configuration. NetPro Discussion Forums Featured Conversations Networking Professionals Connection is a forum for networking professionals to share questions, suggestions, and information about networking solutions, products, and technologies. The featured links are some of the most recent conversations available in this technology. NetPro Discussion Forums Featured Conversations for VPN Service Providers: VPN Service Architectures Service Providers: Network Management Virtual Private Networks: General Related Information IPSec Support Page Technical Support Cisco Systems All contents are Copyright Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement. Updated: Jan 04, 2006 Document ID: 14120
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