Skip site navigation (1)Skip section navigation (2)
Date:      Sun, 1 Aug 2004 20:04:31 +0200
From:      "Albert van Dam" <>
To:        "'Loren M. Lang'" <>
Subject:   RE: Multicast Forwarding
In-Reply-To: <>

Next in thread | Previous in thread | Raw E-Mail | Index | Archive | Help

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.


-----Original Message-----
From: Loren M. Lang [] 
Sent: 01 August 2004 18:53
To: Albert van Dam
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: connected with cross over to wireless 
> router A (IP: - sis0)
> * PC2 (IP: connected with cross over to wireless 
> router B (IP: - sis0)
> * Wireless router A (IP: - wi0) connected with 802.11b

> to Wireless router B (IP: - 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
> _______________________________________________
> mailing list 
> To unsubscribe, send any mail to 
> ""

I sense much NT in you.
NT leads to Bluescreen.
Bluescreen leads to downtime.
Downtime leads to suffering.
NT is the path to the darkside.
Powerful Unix is.

Public Key:
Fingerprint: B3B9 D669 69C9 09EC 1BCD  835A FAF3 7A46 E4A3 280C