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

[Hervé Léonard]

You're right BMS:

I did that command on xorp router:

#ifconfig eth0 allmulti

Then my group join IGMP report messages are dealed and IGMP query are send
by xorp router.
And I see the IGMP group membership on xorp router.

Before that, it seems that the network card driver only forwards to kernel
the 224.0.0.x addresses but not the other multicast addresses....

Thanks,
Léo

-----Message d'origine-----
De : Bruce M Simpson
Envoyé : lundi 6 octobre 2008 17:46
À : Hervé Léonard
Cc : xorp-users at xorp.org
Objet : Re: [Xorp-users] IGMP report group ...?


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

__________ Information NOD32 3499 (20081007) __________

Ce message a ete verifie par NOD32 Antivirus System.
http://www.nod32.com