Linux Ethernet Bridging - Apr 2007 - [Bridge] Bridge Problem: Ping works, nothing else does...

Hi,
I'm a newbie to linux to an extent but have a need to set up a linux
bridge to do some paclet loss testing using netem.  I have a PC with two
NIC cards and Fedora 6.  I have created the bridge using the following
commands

#brctl addbr mybridge
#brctl addif mybridge eth0
#brctl addif mybridge eth1
#brctl mybridge up

Physically I have two IP devices with static IP addresses connected to
the two NIC cards via cross over cables.  I have tested the NIC cards in
a non bridged mode and they work fine as normal NICs.  In bridged mode I
can ping the other IP device.  The IP devices are actually realtime
audio over IP codec devices and they stream using RTP on UDP port 5000.
If I connect the cross over cable directly between the two codec devices
the audio is transferred fine, if I put the linux bridge between them I
get nothing but I can still ping.....

A brctl showstp shows the eth0 and eth1 are in forwarding status but
nothing is happenig.  Can anyone help.  Both Eth1 and 0 are set to Ip
address of 0.0.0.0

Thanks


Regards
David Bainbridge

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On Tue, 10 Apr 2007 14:38:46 +1000
"Bainbridge, David D" <David.D.Bainbridge@team.telstra.com>
wrote:
> Hi,
> I'm a newbie to linux to an extent but have a need to set up a linux
> bridge to do some paclet loss testing using netem.  I have a PC with two
> NIC cards and Fedora 6.  I have created the bridge using the following
> commands
> 
> #brctl addbr mybridge
> #brctl addif mybridge eth0
> #brctl addif mybridge eth1
> #brctl mybridge up
> 
I assume you setup IP address for mybridge:
  ifconfig mybridge 192.168.0.X

Check status with:
  brctl showstp mybridge

> Physically I have two IP devices with static IP addresses connected to
> the two NIC cards via cross over cables.  I have tested the NIC cards in
> a non bridged mode and they work fine as normal NICs.  In bridged mode I
> can ping the other IP device.  The IP devices are actually realtime
> audio over IP codec devices and they stream using RTP on UDP port 5000.
> If I connect the cross over cable directly between the two codec devices
> the audio is transferred fine, if I put the linux bridge between them I
> get nothing but I can still ping.....
> 
> A brctl showstp shows the eth0 and eth1 are in forwarding status but
> nothing is happenig.  Can anyone help.  Both Eth1 and 0 are set to Ip
> address of 0.0.0.0
> 
> Thanks
> 
> 
> Regards
> David Bainbridge
What hardware is being used for eth0 and eth1, I assume both are normal
ether devices. They need to support source address spoofing, and promiscuous
mode.


-- 
Stephen Hemminger <shemminger@linux-foundation.org>