Re: network address translation (nat) issue


maciek wrote:

Sorry not having mentioned that. We are talking about 2851 Cisco IOS
Router @ IOS ver 12.3(8).

maciek

maciek wrote:
Hi,

Is it possible to setup NAT in such a way that hosts from the inside
network can reach other inside hosts that are statically nated ? (I
mean NAT that translates, in reality, from ip nat inside interface to
another ip nat inside interface). If so, how can this be achieved.
Thanks for any comments or hints.

Regards

Maciek



what device/OS/ version are you taking about

Possibly.

I would expect (but do not know) that an interface can be
both "inside" and "outside" at the same time.

There are also a few non-obvious (to me anyway) 'tricks' available.

You can create a loopback interface and use policy routing
to force your traffic from the original source interface to the
loopback. The loopback could be a nat-outside interface.
The traffic could then be router normally but has had an
extra NAT operation available.

You can put policy maps on your nat statements.
I believe that this allows the full power of policy
maps to be applied to natted traffic.
Various match and set clauses. No idea what you can actually
use this for though other than sending traffic to loopbacks
as discussed above.

There is a document that you may find interesting
which describes doing NAT on a router with
only one interface.
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094430.shtml
Network Address Translation on a Stick

.