Ethereal-users: Re: [Ethereal-users] excluding loopback from capture?

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From: Guy Harris <gharris@xxxxxxxxx>
Date: Sat, 04 Sep 2004 14:26:57 -0700
Jason Wei wrote:


I'm in a class that uses Linux machines and Cisco 2611
routers.  One problem I get is that some interfaces on
the routers keep sending out loopback packets.  Is
there a way to exclude these loopback packets from my
ethereal capture?
Possibly - what identifies the packets as loopback packets? Do they have a particular Ethernet type (as Ethernet loopback packets do, with a type of 9000), or are they to or from a particular UDP port number (if they're UDP packets), or something such as that?
I.e., "loopback packets" doesn't necessarily uniquely identify a particular type of packet; whether it's possible to exclude them depends on the type of loopback packet.