Hi
I know there is plenty topics about VLAN, but i didnt find the way to 
solve my problem.
I need to configure VLAN for domU, i'm using script from this page : 
http://renial.net/weblog/
So i have :
bridge name     bridge id               STP enabled     interfaces
vlanbr16           8000.feffffffffff       no                  vif37.0
                                                                       
  eth1.16
vlanbr5             8000.feffffffffff       no                  eth1.5
xenbr0              8000.feffffffffff       no                  peth0
                                                                       
   vif0.0
xenbr1          8000.feffffffffff       no                         peth1
                                                                       
   vif0.1
I have 2 NICs, eth0 is only for dom0 (and new domU i make, before i move 
them), only configured  for our VLAN 26, that works.
eth1 is for domUs, my problem is that when i put a domU in vlanbr5 it 
works but when i put it in vlanbr16 the network on my domU failed.
when i tcpdump my nic,  the only traffic i have with my domU is
15:00:07.074676 arp reply 
10.34.251.1 is-at 00:0a:5e:1a:5f:b2 (oui Unknown)
10.34.251.1 is my gateway.
Pliz, tell me u can notice something wrong, its so weird.
Thx
JM
PS: i've done ethtool -K eth1 tx off and ifconfig eth1 mtu1496 in domU 
and dom0.