Xen users - Oct 2006 - Trying to create second bridge on dom0: no packet gets through

I have a bridge on my dom0 which works fine and connect the dom0 to
some domUs.

I want to create a second bridge which will connect two of the domUs
(not the dom0).

I''ll see later how to make it automatic at startup but, in the mean
time, I try manually:

1) I create the bridge with ''brctl addbr calormen''. It works
OK.

2) I start the domUs with "vif =
[''bridge=calormen'']" in their
configuration. It seems to work. Each domU has its Ethernet interface.

3) I can see the bridge, connected to the domU 3 and 4:

bridge name     bridge id               STP enabled     interfaces
calormen                8000.feffffffffff       no              vif4.0
                                                        vif3.1

But no packet gets through. When the two domUs try to ping each other,
there is no reply and tcpdump sees nothing.

Here is ifconfig''s output on dom0 :

vif4.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF  
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:48 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:6 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:2232 (2.1 KiB)  TX bytes:0 (0.0 b)

vif3.1    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF  
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:7 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1 errors:0 dropped:5 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:506 (506.0 b)  TX bytes:70 (70.0 b)

And on domU #4 :

eth0      Link encap:Ethernet  HWaddr 00:16:3E:78:DF:A0  
          inet addr:192.179.6.2  Bcast:192.179.6.255  Mask:255.255.255.0
          inet6 addr: fe80::216:3eff:fe78:dfa0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:48 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 b)  TX bytes:2232 (2.1 Kb)

And on domU #3 :

xennet1: flags=8863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST> mtu
1500
        address: 00:16:3e:72:36:42
        input: 1 packet, 70 bytes, 1 multicast
        output: 0 packets, 548 bytes, 5 multicasts
        inet 192.179.6.1 netmask 0xffffff00 broadcast 192.179.6.255
        inet6 fe80::216:3eff:fe72:3642%xennet1 prefixlen 64 scopeid 0x3

Xen 3.0
dom0 is Linux 2.6.16 
domU #3 is NetBSD current XEN3_U (an uncommon system, I know, but it
works fine with a more classical setup of just one bridge). Also,
replacing it with a Linux changes nothing
domU #4 is Linux 2.6.16


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