Does ASA5510 check xlate table first when coming from inside?

Unanswered Question
Sep 9th, 2009
User Badges:

Cisco document says by default traffic from higher level interface to lower level interface is always allowed. However it seems for traffic going from higher interface to lower interface, ASA always checks xlate table first. So there should always be some type of NAT (pool or static) or PAT configured from higher interface to lower interface.


Is it correct?


Thanks

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
Collin Clark Wed, 09/09/2009 - 08:02
User Badges:
  • Purple, 4500 points or more

Yes that is correct. Here's an example NAT from 'outside' to 'inside'


static (inside,outside) 75.50.95.72 10.10.5.65 netmask 255.255.255.255


Hope that helps.

m.reay Wed, 09/09/2009 - 08:30
User Badges:

You don't always need to nat the source - you can also use nat bypass or nat exemption, but this still has to be configured.


There is also an option to negate the use of NAT totally - the no nat-control command, however I recommend you fully understand this command before you use it.


gwhuang5398 Wed, 09/09/2009 - 18:35
User Badges:

Thanks all. I'm clear now. I just didn't find it clearly specified in any Cisco documentations.


I've never tried "no nat-control".

Actions

This Discussion