From: Tom Nooning (t.nooning@insightbb.com)
Date: Mon Jun 06 2005 - 22:05:29 GMT-3
I *think* you may have the logic reversed in your NAT statement:
ip nat outside source static udp 142.20.28.14 520 224.0.0.9 520
Try:
ip nat outside source static udp 224.0.0.9 520 142.20.28.14 520
Of course, I could always be very, very wrong.
-Tom
----- Original Message -----
From: <gladston@br.ibm.com>
To: <ccielab@groupstudy.com>
Sent: Monday, June 06, 2005 11:51 AM
Subject: NAT - Unexpected behavior
> Hi,
>
> Studying the example used on Gorito's book, lab1.
> It works fine, 224.0.0.9 is converted to unicast using NAT.
>
> But when I try to see the opposite convertion, debug does not show it.
>
> R2(e0/1)-----(eo)R14
>
> R2 is configured with NAT and converts RIP advertisement:
>
> *Mar 1 04:03:17: RIP: sending v2 update to 224.0.0.9 via Ethernet0/1
> (142.20.28.2)
> *Mar 1 04:03:17: RIP: build update entries
> *Mar 1 04:03:17: 0.0.0.0/0 via 0.0.0.0, metric 1, tag 0
> *Mar 1 04:03:17: 142.20.2.0/24 via 0.0.0.0, metric 1, tag 0
> *Mar 1 04:03:17: 142.20.12.0/24 via 0.0.0.0, metric 1, tag 0
> *Mar 1 04:03:17: 142.20.23.0/24 via 0.0.0.0, metric 1, tag 0
> *Mar 1 04:03:17: 142.20.125.0/27 via 0.0.0.0, metric 1, tag 0
> *Mar 1 04:03:17: NAT: s=142.20.28.2, d=224.0.0.9->142.20.28.14 [0]
>
> Now, I expect RIP traffic coming from R14 (source in this case, on the
> opposite hand when traffic goes from R2 to R14) to be converted, but it is
> not (at least, not showed by debug ip nat:
>
> *Mar 1 04:05:09: IP: s=142.20.28.14 (Ethernet0/1), d=224.0.0.9, len 52,
> rcvd 2
> *Mar 1 04:05:09: UDP src=520, dst=520
> *Mar 1 04:05:09: RIP: received v2 update from 142.20.28.14 on Ethernet0/1
> *Mar 1 04:05:09: 142.20.14.0/24 via 0.0.0.0 in 1 hops
> Rack2R2#
>
> Am I wrong or NAT should convert the source 142.20.28.14 to 224.0.0.9,
> because the following NAT command?
>
> R2
> ip nat outside source static udp 142.20.28.14 520 224.0.0.9 520
> !
> int e 0/1
> ip nat outside
>
> Rack2R2#
>
> Rack2R2#sh ip nat tr
> Pro Inside global Inside local Outside local Outside
> global
> udp --- --- 224.0.0.9:520
> 142.20.28.14:520
>
> Or am I missing some rule like 'traffic destinated to the router is not
> NATed'?
>
> Thanks for any feedback.
>
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