From: Bolcer, Matt (matt.bolcer@xxxxxxx)
Date: Wed Jan 03 2001 - 15:27:15 GMT-3
Keeps the host portion of the address the same as the original public-side
for the translated address assigned by the pool when it goes out the
private-side (e.g., nat isnide interface). I guess it makes it easier to
figure out what host is getting translated where or, for downstream firewall
filtering, etc.
-----Original Message-----
From: Michelle T [mailto:mtruman@mn.mediaone.net]
Sent: Wednesday, January 03, 2001 12:57 PM
To: ccielab@groupstudy.com
Subject: IP Nat and the "Match-Host" keyword
Can someone help me make sense of the "match-host" keyword in IP NAT?
Cisco's definition is listed below, and I still just don't get it.
Host Number Preservation:
For ease of network management, some sites wish to translate prefixes, not
addresses. That is, they wish the translated address to have the same host
number as the untranslated address. Of course, the two prefixes must be of
the same length. This feature can be enabled by configuring dynamic
translation as usual, but configuring the address pool to be of type
"match-host":
ip nat pool fred <start> <end> prefix-length <len> type match-host
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