[Xen-devel] Re: [xen-discuss] problem with network in domU

[michael schuster <Michael.Schuster@xxxxxxx>]

Maciej Browarski wrote:
> Hello,
> I'm using xen-3.1.2 downloaded today from repository.
> As dom0 I have linux-kernel 2.6.18 and Debian distro.
> As domU I install OpenSolaris Nevada 75a.
> My config file looks:
> name = 'osdev'
> memory = '1024'
> vcpus = 2
> disk = [ 'file:/mnt/xen/osdev/disk.raw,0,w',  
> 'file:/mnt/xen/osdev/disk1.raw,1,w' ]
> vif = [ '' ]
> on_shutdown = 'destroy'
> on_reboot = 'destroy'
> on_crash = 'destroy'
>
> After xm create I see new devices in dom0: peth0, xenbr0 and etc.
> bash# brctl show
> xenbr0          8000.feffffffffff       no              vif0.0
>                                                         peth0
>                                                         vif3.0
> So, on dom0 outside network works fine, but on domU I have strange 
> behavior ( dom0 and domU has addresses from DHCP).
>  From domU I catch good address. I can also ping outside gateway but 
> connect with any TCP/UDP ports outside my machine is incorrect (there 
> are only SYN and SYN/ACK nothing more and timeout).
> All connection between dom0 and domU works good.
> Have you any idea what's wrong ?
sounds a bit like you're having difficulty with checksums.

the following is a way to disable ip checksums *in dom0*; I don't know 
whether the same works in domU, but you could give it a try:
Set "ip:dohwcksum" to 0 in /etc/system. Reboot, retest, report results.

(btw: that means you need to add a line looking like this:
        set ip:dohwcksum = 0
to /etc/system in your domU)

hth
--
Michael Schuster        Sun Microsystems, Inc.
recursion, n: see 'recursion'

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