Linux bridge thruput problem

Linux bridge thruput problem

Post by Paul Gan » Thu, 29 Jul 2004 05:01:04

If this isn't the right newsgroup for this, please let me know.

I have a P4 2.4GHz system with 4 3COM 3C905C cards installed, running 2.6.7
and Slackware 10 distrib.

The kernel is compiled with bridge support and ebtables support.  I have the
brctl tools and ebtables tools installed

I have executed these commands:

brctl addbr port
brctl addif port eth1
brctl addif port eth2
brctl addif port eth3
ifconfig eth1
ifconfig eth2
ifconfig eth3
ifconfig port up

Note, eth0 is connected to a 10mbps broadband connection and is assigned an
IP.  eth1 is connected to the same network.  eth2 and eth3 have test
machines connected to them via. crossover cables.

Now, on this server, I can do Internet downloads at 800-900K/second - i.e.
the traffic goes via. eth0.

However, the test machines on eth2 and eth3 can only do Internet downloads
at 30K/second.  It's like I have a bandwidth limiter installed, but of
course I don't.

Why is my bridge giving me such poor performance?

Paul Gani


1. bridging problem -- bridge needs IP address

Hi everyone,

i tried to set up a bridge with my fedora core 3, kernel
2.6.10-1.741_FC3. I entered following commands:

# ifconfig eth0 promisc up
# ifconfig eth1 promisc up
# brctl addbr br0
# brctl addif br0 eth0
# brctl addif br0 eth1
# ifconfig br0 up

It was possible to create the bridge, but there is a problem: The
bridge doesn't forward traffic until i assign an IP address to the
interface br0. But that's not what i want.
Any ideas?



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