Xen users - Jul 2006 - faq, brigde, 2 interfaces, vlan and tagging, checksum?

hi.
sorry for my bad english, i am 9 hours @ work by now..

i am setting up a machine with 2 nic, and i have followed this howto for this:
http://zh.stikipad.com/notes/show/Xen+domUs+with+two+NICs

eth0 is up, eth1 is up, eth1.600 is configured and nothing more (so, no 
interfaces configured on eth0, just up)

now on, brctl show this:
xen ~ # brctl show
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.feffffffffff       no              vif0.0
                                                        peth0
                                                        vif1.0
xenbr1          8000.feffffffffff       no              vif0.1
                                                        peth1
xen ~ # 
same bridge id: is this a problem or is it normal?

anyway:
i can do ssh without any problem to dom0, and sometimes on virtual machine 
(like tcpdump something, or ps aux) it stop responding.

i have red 
http://wiki.xensource.com/xenwiki/XenFaq#head-4ce9767df34fe1c9cf4f85f7e07cb10110eae9b7

and i have patched kernel[1], without luck.
i have tried ethtool, without luck.

any hint?

thanks
Daniele

1: tried first with: 
http://lists.xensource.com/archives/html/xen-devel/2006-04/msg00625.html
then cleared patch and tried with: 
http://lists.xensource.com/archives/html/xen-devel/2006-03/msg01445.html

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