Re: [Xen-users] unstable network problem

[Nivedita Singhvi <niv@xxxxxxxxxx>]

Tim Durack wrote:
> txqueuelen didn't work here either.
>
> For what it's worth, here's what the capture looks like for Dom0 -> guest:
For a temporary workaround, could you disable checksumming:

ethtool -K tx off

in each domain?

thanks,
Nivedita


> tethereal -i eth0
> device eth0 entered promiscuous mode
> Capturing on eth0
>   0.000000  192.168.1.1 -> 192.168.1.2  TCP 59135 > ssh [SYN] Seq=0
> Ack=0 Win=5840 Len=0 MSS=1460 TSV=122820 TSER=0 WS=2
>   0.002181  192.168.1.2 -> 192.168.1.1  TCP ssh > 59135 [SYN, ACK]
> Seq=0 Ack=1 Win=5792 Len=0 MSS=1460 TSV=115220 TSER=122820 WS=1
>   0.003497  192.168.1.1 -> 192.168.1.2  TCP 59135 > ssh [ACK] Seq=1
> Ack=1 Win=5840 Len=0 TSV=122820 TSER=115220
>   0.010001  192.168.1.2 -> 192.168.1.1  SSH Server Protocol:
> SSH-2.0-OpenSSH_4.1p1 Debian-6
>   0.010472  192.168.1.1 -> 192.168.1.2  TCP 59135 > ssh [ACK] Seq=1
> Ack=32 Win=5840 Len=0 TSV=122821 TSER=115221
>   0.010478  192.168.1.1 -> 192.168.1.2  SSH Client Protocol:
> SSH-2.0-OpenSSH_4.1p1 Debian-6
>   0.215968  192.168.1.1 -> 192.168.1.2  SSHv2 [TCP Retransmission]
> Client: Unknown (46)[Unreassembled Packet [incorrect TCP checksum]]
>   0.635966  192.168.1.1 -> 192.168.1.2  SSHv2 [TCP Retransmission]
> Client: Unknown (46)
>   1.475967  192.168.1.1 -> 192.168.1.2  SSHv2 [TCP Retransmission]
> Client: Unknown (46)
>   3.155992  192.168.1.1 -> 192.168.1.2  SSHv2 [TCP Retransmission]
> Client: Unknown (46)
>   5.466528  192.168.1.2 -> fe:ff:ff:ff:ff:ff ARP Who has 192.168.1.1? 
> Tell 192.168.1.2
>   5.466572  192.168.1.1 -> 192.168.1.2  ARP 192.168.1.1 is at fe:ff:ff:ff:ff:ff
>   6.515988  192.168.1.1 -> 192.168.1.2  SSHv2 [TCP Retransmission]
> Encrypted request packet len=31
>  13.235996  192.168.1.1 -> 192.168.1.2  SSHv2 [TCP Retransmission]
> Encrypted request packet len=31
>
>
> Interestingly if I build two guests I can ssh between them just fine.
>
> Tim:>
>
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