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Re: Sniffing traffic of an enabled cisco router
From: Carlos Fragoso <carlos.fragoso () gmail com>
Date: Tue, 16 May 2006 02:18:21 +0200

Hi Hugo,

Hugo Vinicius Garcia Razera wrote:
is there any way to create like a policy routing on the Linux box, and
specify that any traffic coming from the interface tun0 to be send it
back from where it came.

There isn't any need to perform policy routing. You can just set up any
necessary static /32 routes such as to the sniffing router, your dns
server, etc pointing to your default gateway. Then you can just set up
the default route to go through the tun0 interface.

I also have used the command
debug ip packets <acl number> dump

to see the traffic on the telnet terminal but the load is very heavy
and the router died

Don't ever think to use 'debug ip packets', that's pretty overwhelming
for a router. If you want to check which traffic is leaving/reaching the
router just set up an standard/extended classification access-list on
the interface and check matching counters.

Take care

-- Carlos

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