From: Chris Lewis \(chrlewis\) (chrlewis@cisco.com)
Date: Fri Aug 26 2005 - 11:28:08 GMT-3
True, but will anything other than RIP be sending to 224.0.0.9 in the
exam? :)
But I think you're right really, in the exam that would be a good thing
to do.
Chris
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Mitchell, TJ
Sent: Friday, August 26, 2005 9:24 AM
To: Chris Lewis (chrlewis); dusth@comcast.net; ccielab@groupstudy.com
Subject: RE: RIP Unicast Update
Chris -
On your NAT item something you should think about is using the udp
option. Granted what you did worked, RIPv2 uses UDP 520 (which I'm sure
you know), so to ensure that it only NAT's RIPv2 you should add that to
your ip nat statement.
Thanks
T.J. Mitchell
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Chris Lewis (chrlewis)
Sent: Friday, August 26, 2005 10:10 AM
To: dusth@comcast.net; ccielab@groupstudy.com
Subject: RE: RIP Unicast Update
You need to understand the concept of an inside destination address
mapping to an outside source address, put simply, if a packet is
originated from router A to Router B, the address Router A uses to
source the address, becomes the destination address for router B to
reply to.
So, if you look at it this way, an outside source translation works on
the inside destination address.
Applying this to the question, say you want to NAT packets destined to
224.0.0.9 going out serial 1/0
Interface serial 1/0
Ip nat outside
!
ip nat outside source static 131.108.50.2 224.0.0.9
Then check with a debug
R1#deb ip nat det
IP NAT detailed debugging is on
R1#
*Aug 26 13:58:40.791: NAT: i: udp (131.108.50.1, 520) -> (224.0.0.9,
520) [0]
*Aug 26 13:58:40.791: NAT: s=131.108.50.1, d=224.0.0.9->131.108.50.2 [0]
And if you look at debug ip packet detail on the connected router
(131.108.50.2) you see the following:
*Aug 26 14:00:04.483: IP: s=131.108.50.1 (Serial2/0), d=131.108.50.2
(Serial2/0), len 52, rcvd 3
*Aug 26 14:00:04.483: UDP src=520, dst=520
In the heat of the exam, it could be easy to get the two addresses the
wrong way around on the ip nat command, so knowing how to check
operation with these debugs is the most important thing IMHO.
Chris
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Sent: Friday, August 26, 2005 8:03 AM
Subject: RIP Unicast Update
Hi all,
I know there are multiple ways to configure RIP unicast update but I
only clear and know how to configure via <passive interface and
neighbor> command. I know the other method is NAT but I do not know how
to configure it. Could someone has experience and shed some
configuration example to me please?
Thank,
Dustin
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