[CentOS] CentOS 6 bridging problem.

On 06/25/2012 05:22 AM, Rafał Radecki wrote:
> Do you see an error in my configuration? Why is 10.20.0.108 not available?

Not immediately, but check the output of the 'ip' tools.  ifconfig and 
route are deprecated:

ip route show
ip addr show

Finally, see if there's any incoming traffic on the tagged interface:

tcpdump -n -i eth0.20

... while you ping the assigned address.