Will bridge work without IP address?

Dims · 05-21-2009, 11:03 AM

If I have a machine with two NICs eth0 and eth 1 with different IPs, can I just do

brctl addbr br0
brctl addif eht0
brctl addif eht1

to make ethernet packets forwarding between subnets? I.e. may I not to assign IP address to the bridge?

kirukan · 05-21-2009, 11:20 AM

yess because bridge is working in layer2

Dims · 05-21-2009, 12:18 PM

I undertood now: bridge is working, but IPs of interfaces are unpingeable since linux does not see interfaces.

kirukan · 05-21-2009, 02:01 PM

What do you mean?

Quote:

since linux does not see interfaces

you can assign IPs for interfaces and it can ping & ssh

Dims · 05-24-2009, 01:12 AM

My interfaces already had IPs.

After commands

brctl addbr br0
brctl addif eht0
brctl addif eht1
ifconfig br0 up

linux became inaccessible, but the bridge was working (since device behind it was accessible).

How do you explain this?

Dims · 05-24-2009, 01:16 AM

My explanation is follow:

1) bridge wa "eating" all data from network to eth0 or eth1, so linux received nothing from eth0 and eth1
2) br0 had no IP, so linux expected nothing from it

Hence, linux was not "feel" network existence.