Stateful NAT (SNAT)

Posted on April 8, 2011. Filed under: cisco ios | Tags: , |

Nice feature for maintaining stateful NAT sessions between two border routers.

Communication is established between two or more routers via TCP, session information is shared.

ISP2#sh ip snat distributed
Stateful NAT Connected Peers
SNAT: Mode BACKUP    : State READY    : Local Address    : Local NAT id 2    : Peer Address    : Peer NAT id 1    : Mapping List 10

ISP2#sh ip snat peer
Show NAT Entries created by peer:
Pro Inside global      Inside local       Outside local      Outside globalicmp

ip nat Stateful id 1
mapping-id 10
ip nat pool nat-pool netmask
ip nat inside source route-map nat-rm pool nat-pool mapping-id 10 overload

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