Multicast questions

[Bernd Walter]

On Wed, Apr 27, 2011 at 05:32:36PM +0200, Bernd Walter wrote:
> I have some strange problems with multicast.
> Tested host is running FreeBSD 8.1-RELEASE.
> System is a jailed environment.
> 
> Outside of the jail I can start a multicast reader:
> [54]host# mcastread -v6 lo0 ff35::fe00:1 5356
> mcastread: trying ff35::fe00:1
> mcastread: using ff35::fe00:1
> 
> Inside the jail however it fails on binding to the address:
> [85]jail# mcastread -v6 lo0 ff35::fe00:1 5356
> mcastread: trying ff35::fe00:1
> mcastread: bind: Can't assign requested address
> mcastread: can't allocate socket

Ok - adding the multicast-IP to the jail list helps.
This leaves the interface problem.

> Is there any workaround for this problem?
> I've read about vimage, but I would like to live without it.
> 
> Sending to the multicast group works more or less:
> [94]jail# echo test | mcastsend ff35::fe00:1 5356
> mcastsend: send: No route to host
> Exit 1
> [95]jail# echo test | mcastsend -i lo0 ff35::fe00:1 5356
> The last one is received with the reader running on the host.
> But why do I get a no route to host error without using an
> interface for a site local address?
> 
> With the only anycast address configured to lo0 using another interface
> fails inside the jail:
> [99]jail# echo test | mcastsend -i em0 ff35::fe00:1 5356
> mcastsend: Failed to bind source address.
> Exit 1
> Do I really need to configure the address to the LAN interface?
> 
> -- 
> B.Walter <bernd at bwct.de> http://www.bwct.de
> Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.

-- 
B.Walter <bernd at bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.