NAT exemption to no nat control after upgrade

rickr61982 · ‎04-08-2009

Hello all,

We are presently running FWSM 2.3(3)6 and are upgrading to the 3.2 code train. My question is if we are presently running NAT exemption with plans of implementing no nat control post upgrade, are there any caveats/implications to doing so. Will typing "no nat control" post upgrade wipeout any nat commands from the configuration and is it that simple???

Regards,

Rick

smalkeric · ‎04-14-2009

If you disable NAT control (no nat-control) then you can remove the outside NAT exemption command. By default, the FWSM creates NAT sessions for all connections even if you do not use NAT. For example, a session is created for each untranslated connection even if you do not enable NAT control, you use NAT exemption or identity NAT, or you use same security interfaces and do not configure NAT.