Cabletron Systems SmartSwitch manual Using Dynamic NAT with Matching Interface Redundancy

Chapter 14: Network Address Translation Configuration Guide

Next, define the interfaces to be NAT “inside” or “outside”:

nat set interface 10-net inside nat set interface 192-net outside nat set interface 201-net outside

Then, define the NAT dynamic rules by first creating the source ACL pool and then configuring the dynamic bindings:

acl lcl permit ip 10.1.1.0/24

nat create dynamic local-acl-pool lcl global-pool 192.50.20.0/24 matching- if 192-net

nat create dynamic local-acl-pool lcl global-pool 210.50.20.0/24 matching- if 201-net

Using Dynamic NAT with Matching Interface Redundancy

If you have redundant connections to the remote network via two different interfaces, you can use NAT for translating the local address to the different global pool specified for the two connections. This case is possible when you have two ISPs connected on two different interfaces to the Internet. Through a routing protocol, some routes will result in traffic going out of one interface and for others going out on the other interface. NAT will check which interface the packet is going out from before selecting a global pool. Hence, you can specify two different global pools with the same local ACL pool on two different interfaces.

SmartSwitch Router User Reference Manual 231