vlan + bridge + xen

[brook%biology.nmsu.edu@localhost (Brook Milligan)]

I am trying to set up xen networking with a vlan.  I have found the
thread in port-xen from May 2007, for example:

       http://mail-index.netbsd.org/port-xen/2007/05/26/0003.html

However, that thread does not seem to end with a clear configuration
and I am not able to get everything to work correctly despite being
able to do so between hosts on a real ethernet.  I must be missing
something obvious to everyone in the earlier thread.

Below is one iteration of my setup that I thought would mimic the real
ethernet vlan that I can get to work just fine.  However, no luck.

Can someone either illustrate a specific configuration known to work
and/or point me to a clear description of the flow of packets through
the myriad interfaces and network stacks.  I think I'm having trouble
visualizing the exact pathway for packets as the internal bridging
seems to interact with the vlan differently than I would have
expected.

Thanks alot for your help.

Cheers,
Brook

===========================================================================
dom0:

xvif11.0: flags=8963<UP,BROADCAST,NOTRAILERS,RUNNING,PROMISC,SIMPLEX,MULTICAST> 
mtu 1500
        capabilities=2800<TCP4CSUM_Tx,UDP4CSUM_Tx>
        enabled=0
        address: 00:16:3e:01:00:12
        inet6 fe80::216:3eff:fe01:12%xvif11.0 prefixlen 64 scopeid 0x11
tap0: flags=8902<BROADCAST,PROMISC,SIMPLEX,MULTICAST> mtu 1500
        address: f2:0b:a4:95:13:0b
        media: Ethernet autoselect
bridge0: flags=0 mtu 1500
vlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        vlan: 6 parent: tap0
        address: f2:0b:a4:95:13:0b
        inet 172.30.0.254 netmask 0xffffff00 broadcast 172.30.0.255
        inet6 fe80::f00b:a4ff:fe95:130b%vlan0 prefixlen 64 scopeid 0x16

bridge0: flags=0<>
        Configuration:
                priority 32768 hellotime 2 fwddelay 15 maxage 20
                ipfilter disabled flags 0x0
        Interfaces:
                xvif11.0 flags=3<LEARNING,DISCOVER>
                        port 17 priority 128
                tap0 flags=3<LEARNING,DISCOVER>
                        port 20 priority 128
        Address cache (max cache: 100, timeout: 1200):

Routing tables

Internet:
Destination        Gateway            Flags    Refs      Use    Mtu  Interface
172.30.0/24        link#22            UC          0        0      -  vlan0

===========================================================================
domU:

xennet0: flags=8863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        capabilities=2800<TCP4CSUM_Tx,UDP4CSUM_Tx>
        enabled=0
        address: 00:16:3e:00:00:12
        inet6 fe80::216:3eff:fe00:12%xennet0 prefixlen 64 scopeid 0x1
vlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1496
        vlan: 6 parent: xennet0
        address: 00:16:3e:00:00:12
        inet 172.30.0.2 netmask 0xffffff00 broadcast 172.30.0.255
        inet6 fe80::216:3eff:fe00:12%vlan0 prefixlen 64 scopeid 0x3

Routing tables

Internet:
Destination        Gateway            Flags    Refs      Use    Mtu  Interface
default            172.30.0.254       UGS         0        0      -  vlan0
172.30.0/24        link#3             UC          1        0      -  vlan0
172.30.0.254       link#3             UHLc        1        8      -  vlan0