Re: [Qemu-devel] VLAN connection issue between Qemu instances.

[Karel Gardas]

Ben,

thanks for fast reply, but unfortunately this does not help. Interesting 
that now ping in guest "works" forever, which means it's not complaining 
about host down, but also loses 100% packets. What I see in tcpdump on 
host are good packets from server side qemu, but wrong (TCP checksum 
invalid) packets from the client side qemu.

E.g.

00:41:12.470887 IP (tos 0x0, ttl  64, id 42317, offset 0, flags [DF], 
length: 56) localhost.localdomain.32960 > localhost.localdomain.11234: P 
[bad tcp cksum fe2c (->b649)!] 2448:2452(4) ack 2449 win 8192 
<nop,nop,timestamp 4101291 4101048>
00:41:12.510409 IP (tos 0x0, ttl  64, id 10538, offset 0, flags [DF], 
length: 52) localhost.localdomain.11234 > localhost.localdomain.32960: . 
[tcp sum ok] ack 2452 win 8192 <nop,nop,timestamp 4101301 4101291>

Is there anything other I might try to better debug this issue?

Thanks a lot!
Karel

On Fri, 28 Apr 2006, Ben Dailey wrote:

> Karel,
>
> Try:
> qemu -hda openbsd-fw1.img -net nic,macaddr=22:33:77:55:66:00 -net
> socket,listen=127.0.0.1:11234
>
> qemu -hda openbsd-fw2.img -net nic,macaddr=11:22:33:44:55:66 -net
> socket,connect=127.0.0.1:11234
>
> Ben
>
> > > > address@hidden 04/28/06 5:04 PM >>>
>
> Hello,
>
> I'm trying to get qemu 0.8.0 working with two instances and VLAN between
>
> them. I'm using socket connections and options like:
>
> qemu -hda openbsd-fw1.img -net nic,macaddr=22:33:77:55:66:00 -net
> socket,listen=:11234
>
> qemu -hda openbsd-fw2.img -net nic,macaddr=11:22:33:44:55:66 -net
> socket,connect=silence:11234
>
> once both OpenBSDs are started, I'm trying to ping from one to another,
> but it's not working. When using tcpdump on the host system I see some
> packets exchanged, but then suddenly after few packates (4-7) it stops
> (in tcpdump) and ping in guest complains about host down. Note that ping
>
> in guest lost 100% of packets.
>
> Qemu is compiled with GCC 3.4 on Debian Sarge on AMD64 (64bit).
>
> Any idea what to do to better debug this issue?
>
> Thanks,
> Karel
> --
> Karel Gardas                  address@hidden
> ObjectSecurity Ltd.           http://www.objectsecurity.com
>
>
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--
Karel Gardas                  address@hidden
ObjectSecurity Ltd.           http://www.objectsecurity.com