From: Curt Girardin (curt.girardin@chicos.com)
Date: Sun Mar 19 2006 - 13:09:39 GMT-3
Team,
I'm having a hard time finding resources that explain many of the
options available when configuring NAT. For someone who has really only
done "vanilla" nat configurations (ip nat inside source overload, static
nat), Cisco's documentation is absolutely horrid.
For example, what do the "extendable", "no-alias", "reversible", and
"no-payload" options do.
Also, when configuring Stateful-nat, the documentation makes mention of
a primary and secondary, nat with HSRP, etc. But it fails to go into
the details of HOW IT WORKS. There is an option to use TCP or UDP.
What does this mean? Is there a actual PORT that is used for
replicating NAT translations and timeout information.
There are also a lot of "tags" (mapping id, group name, snat ID), and
the documentation gives very unclear examples of how these tags
interrelate and which ones neet to match between the HSRP, "ip nat
stateful" commands , and "mapping-id".
Other examples in the documentation seem either misconfigured, or I'm
really missing something. I've found the cisco "nat support page", but
even it has only very basic explanations and examples (lots with ipsec),
but still fails to explain the options like "extendable", "no-alias",
"reversable", "no-payload", statefule nat, and route-maps.
Another example is the use of access-lists and route-maps. Extended
acls seem to be allowed, but in which direction are they compared? What
about route-maps - same question? Route-maps seem to be available in
many different ways with NAT, but very little explanation of how to work
with them.
Seems like the documentation might be a good reference for someone who
already has a DEEP understanding of all the options, but where can I
find good information on what all the options do and how they work?
Thanks,
Curt
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