[Xorp-users] IGMP report group ...?

[Pavlin Radoslavov]

Please check whether the system has any firewall entries which might
drop the IGMP packets.
You didn't specify which Linux distribution, but I think on some
distributions there are default firewall rules which stop the IGMP
packets.

Pavlin

Bruce M Simpson <bms at incunabulum.net> wrote:

> Hervé Léonard wrote:
> > Hi,
> >
> > I try to join a group multicast by sending a IGMP report message from a
> > Linux host to a Linux Xorp router (both on a Linux 2.6 - Ubuntu 8.04 Hardy
> > Heron)
> > ...
> > Host A tries to join the group 239.7.7.7 or 224.7.7.7 by sending IGMP report
> > v2 on the LAN. Xorp Router B do nothing...?
> >   
> ..
> 
> It looks like your XORP router has not received any IGMPv2 JOIN messages.
> 
> Please do the following:
> 
> 1. Check that your network card driver supports "multicast promiscuous" 
> mode (aka ALLMULTI).
>    ifconfig should tell you if this bit is set.
> 
> 2. Check that your router is receiving the IGMPv2 JOIN messages on the 
> correct MAC address, by passing the -e switch to tcpdump. For IGMPv2, 
> this should be the same as the group's MAC address itself.
> 
> We need to be sure that the IGMP messages are in fact being accepted by 
> the socket layer, and going to the xorp_fea process. Most likely the 
> problem is further down in the stack though, I've had problems with the 
> FreeBSD fxp(4) driver recently.
> 
> thanks
> BMS
> 
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