Messages in this thread | | | Date | Wed, 08 Dec 2004 15:58:29 -0500 | From | FoObArf00@netscape ... | Subject | Re: IGMP packets? |
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I have 3 machines. A (eth0) is connected to B (eth1) with a cross over cable and B (eth0) and C (eth0) are on a switch. I want to forward the igmp queries and reports that A (eth1) generates when joining/leaving a multicast group on B (eth1) from B(eth0) to C (eth0). I put the code to do this on different places such as ip_rcv, ip_route_input, etc and no luck. The weird thing is that it works when I do a tcpdump on B's eth1.
A-(eth0)----(eth1)-B-(eth0)----(eth0)-C
Thanks.
Chris Wright <chrisw@osdl.org> wrote:
>* FoObArf00@netscape.net (FoObArf00@netscape.net) wrote: >> I have been trying to analyze igmp packets (queries, reports) with >> ttl of 1 ,of course, in the kernel and ran into a weird situation. >> Only when an interface is in promiscuous mode (i.e. tcpdump), the igmp >> packets get to ip_rcv on ip_input.c. I was wondering if someone can >> point in the right direction on how/where to get the these packets when >> not doing a tcpdump. Thanks > >Could you be more specific? Which machines are involved (e.g. IIRC the >igmp report is not looped back locally). What do you mean by analyze in >the kernel? > >thanks, >-chris >
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