Re: how to duplicate packets

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#2299

From: Walter Roberson
Date: Thu, 20 Jun 2002 00:24

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In article <715239ecc62699672b2290bc21bb1031.40453@mygate.mailgate.org>,
maxmagna <maxmagna@hotmail.com> wrote:
:
:Given a router R with, say, three interfaces (Intf_1, Intf_2, Intf_3). I
:want to duplicate all the packets through Intf_1 on Intf_3, in such a
:way that each packet P going through Intf_1 is still routed the usual
:way but P is *also* sent out on Intf_3. The idea behind this is to use
:Intf_3 as an auxiliary interface to collect traffic of Intf_1 for
:monitoring purposes. Is there a way to do this?

:I am really not that familiar with CISCO routers and I would appreciate
:any pointer or suggestion on this.

The exact command varies according to the router or switch that you
are choosing, as Cisco has a few different software images. Usually Cisco
referrs to this as setting up a "span". If you tell us more precisely the
software you are using, then we could probably point you to the
online documents; or you might just want to search www.cisco.com
on the keyword 'span'.

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From: roberson@ibd.nrc.ca (Walter Roberson)
Newsgroups: comp.dcom.sys.cisco,it.comp.reti.cisco
Subject: Re: how to duplicate packets
Date: 20 Jun 2002 00:24:56 GMT
Organization: National Research Council Canada
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