Re: [Xen-devel] Using non-hvm domU networking takes down dom0 external networking

[Travis Cross <travis@xxxxxxxxxxxxxxxxx>]

> 3. Have domU attempt to ping google, immediatly dom0's ping to google dies and
> nothing short of reboot seems to be able to get it back.

I was unable to reproduce your results on a Pentium D dual-core box
running xen-unstable near the tip.

You might ensure that IP forwarding is enabled (on dom0) with:

# echo "1" > /proc/sys/net/ipv4/ip_forward

The behavior of my networking was a bit quirky until I remembered to
do this.

Cheers,

-- Travis


Adam Wendt wrote:
> Ever since the subarch changeset (8706) and through all the kernel versions
> (.12.6, .14, .15, 16-rc1/2)  and up through the latest changeset (8776) when I
> start a non-hvm domU and ping outside the xen machine the dom0 can no longer 
> ping
> outside the machine (and domU fails from the start).
> 
> Here's a step by step:
> 
> 1. Start machine, start xend, start pinging google from dom0, all is fine, 
> leave
> this running
> 2. Start non-hvm domU, ping its local address, ping the dom0 ip, all is still
> fine and dom0 can still ping google.
> 3. Have domU attempt to ping google, immediatly dom0's ping to google dies and
> nothing short of reboot seems to be able to get it back.
> 
> I have confirmed this on two separate machines with different network cards 
> and
> different motherboards, though both are em64t dual core chips. Changeset 8705 
> has
> no problem but anything after that shows this behavior.
> 
> My networking setup is about as stock as it comes, no firewalls, basic eth0 
> with
> default network scripts, generic domU network configuration.
> 
> Any ideas?
> 
> Adam Wendt
> IPCoast, Inc.
> 
> 
> 
> 
> 
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