[Xen-users] HELP: xenbr on vlan if --> tcp checksum error

["Lockenvitz, Jan \(EXT\)" <Jan.Lockenvitz.extern@xxxxxxxxxxxxxx>]

Hi

I'm testing around with xen 3.0 snapshot from last week. And i'm now having a 
problem with a xenbr which is based on a vlan if (dot1q).

this is all in dom0

os: debian testing
network: tg3

I can start the bridge based on my normal physical eth0 which is working 
without any problems.
My clan without bridge is also working.
I can start the bridge based on a vlan if with help of the following command:

  # network-bridge start netdev=vlan100 bridge=xenbr0

The bridge is started (as i think) correctly. My interfaces and bridge looks 
like this:

  # ifconfig

eth0      Protokoll:Ethernet  Hardware Adresse 00:0D:60:14:85:D4
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:27198 errors:0 dropped:0 overruns:0 frame:0
          TX packets:17073 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenl%G�%@ge:1000
          RX bytes:4262353 (4.0 MiB)  TX bytes:11003381 (10.4 MiB)
          Interrupt:24

lo        Protokoll:Lokale Schleife
          inet Adresse:127.0.0.1  Maske:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:27033 errors:0 dropped:0 overruns:0 frame:0
          TX packets:27033 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenl%G�%@ge:0
          RX bytes:11642656 (11.1 MiB)  TX bytes:11642656 (11.1 MiB)

pvlan100  Protokoll:Ethernet  Hardware Adresse FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:24613 errors:0 dropped:0 overruns:0 frame:0
          TX packets:17073 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenl%G�%@ge:0
          RX bytes:3419341 (3.2 MiB)  TX bytes:10865571 (10.3 MiB)

vif0.0    Protokoll:Ethernet  Hardware Adresse FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenl%G�%@ge:0
          RX bytes:0 (0.0 b)  TX bytes:1600 (1.5 KiB)

vlan100   Protokoll:Ethernet  Hardware Adresse 00:0D:60:14:85:D4
          inet Adresse:10.8.15.129  Bcast:10.8.15.255  Maske:255.255.255.128
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenl%G�%@ge:0
          RX bytes:1600 (1.5 KiB)  TX bytes:0 (0.0 b)

vlan105   Protokoll:Ethernet  Hardware Adresse 00:0D:60:14:85:D4
          inet Adresse:10.8.16.161  Bcast:10.8.15.191  Maske:255.255.255.224
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1327 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenl%G�%@ge:0
          RX bytes:66350 (64.7 KiB)  TX bytes:0 (0.0 b)

xenbr0    Protokoll:Ethernet  Hardware Adresse FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenl%G�%@ge:0
          RX bytes:1474 (1.4 KiB)  TX bytes:0 (0.0 b)

  # brctl show

bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.feffffffffff       no              pvlan100
                                                        vif0.0

a ping to an other machine is fine

But i can't ssh to any other machine. I started tracing on another machine and 
ethereal shows an incorrect TCP checksum. And the TCP checksum is this case 
seems to depend on the packet size.
I also traced in dom0 on the following IF: vlan100, pvlan100 and eth0 (where 
the vlan is bound to)
On vlan100 i can see the same packets as on the destination machine, but on 
pvlan100 and eth0 the TCP checksum is correct.

Is this problem known? 

Can someone help to solve this? I can post some traces if necessary

Thanx in advance,
Jan

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