Multicast Forwarding
Albert van Dam
albert at ipdevelopers.co.za
Sun Aug 1 11:04:00 PDT 2004
Loren
We managed to get it working on the 23rd of July. Mrouted does forward
multicast packets as long as at least two machines join a multicast
session. The one channel on one of our routers were stuffed so we
replaced the router and it worked fine from there.
Albert
-----Original Message-----
From: Loren M. Lang [mailto:lorenl at alzatex.com]
Sent: 01 August 2004 18:53
To: Albert van Dam
Cc: freebsd-questions at freebsd.org
Subject: Re: Multicast Forwarding
On Thu, Jul 22, 2004 at 02:56:41PM +0200, Albert van Dam wrote:
> Hi All
>
> I am a newbie to FreeBSD.
>
> We have the following setup in a lab environment:
> * PC1 (IP: 192.168.10.2/24) connected with cross over to wireless
> router A (IP: 192.168.10.1/24 - sis0)
> * PC2 (IP: 192.168.20.2/24) connected with cross over to wireless
> router B (IP: 192.168.20.1/24 - sis0)
> * Wireless router A (IP: 192.168.30.1/24 - wi0) connected with 802.11b
> to Wireless router B (IP: 192.168.30.2/24 - wi1)
>
> PC1 can ping PC2 and PC2 can ping PC1.
> Both Wireless router A and Wireless router B runs FreeBSD. The routing
> on this works but I cannot get UDP Multicast packets through. I have
> read in the FreeBSD docs that mrouted should be running and
> subsequently I have it running on both routers.
>
I think that mrouted will only forward multicast packets that it knows
another interface is subscribed to so network A would have to tell the
router an IGMP packet subscribing to the multicast channel you're
talking on on network B, and vice-versa. Not sure how to generate the
IGMP packet, it's been a while since I worked with multicast.
> Tcpdump shows the UDP multicast packets on Wireless router A from PC1
> on sis0 and UDP multicast packets on Wireless router B from PC2 on
> sis0.
>
> Any help would be greatly appreciated.
>
> Albert
>
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