Re: [Xen-users] Networking change in Xen unstable

[Takeshi Sone <ts1@xxxxxxxxx>]

Hello Mark,
So, could you answer to my original question?
Networking change in unstable breaks my network configuration.
/proc/sys/net/ipv4/ip_forward is not the culprit, since it's been
enabled for years.
What is veth0 thing?
Now I have to kill it after every reboot.

On Sat, Jul 09, 2005 at 05:46:51PM +0100, Mark Williamson wrote:
> > > echo "1" > /proc/sys/net/ipv4/ip_forward
> > >
> > > if memory serves, I believe you have to reboot for this to take effect.
> >
> > /proc is a viritual filesystem -- reboot and its' contents are lost..
> 
> There's a file called (something like) /etc/sysctl.conf for setting /proc/sys 
> values persistently (they're set again at each boot).
> 
> Cheers,
> Mark
> 
> > If you want to make it "permanent", look into sysctl..
> >
> > Hope this helps..
> >
> > Carl
> >
> > > > Hello,
> > > >
> > > > I'm now using Xen unstable, which works very nice.
> > > > For me it's generally more stable than 2.0 (no FPU problem now).
> > > >
> > > > I have noticed that veth0 and vif0.0 appear in net devices,
> > > > and veth0 is attached to xen-br0. Routing to the bridge network is
> > > > now through veth0, instead of xen-br0 like it used to be.
> > > >
> > > > The problem is, my iptables configuration (on dom0) complains
> > > > with this setup. This message appears in kernel log (dmesg):
> > > >
> > > >     Performing cross-bridge DNAT requires IP forwarding to be enabled
> > > >
> > > > I'm DNATting DNS requests from Internet to domU, and it doesn't work.
> > > >
> > > > Killing veth0 and assigning IP address to xen-br0 fix this problem:
> > > >
> > > >     # ifconfig veth0 0.0.0.0
> > > >     # ifconfig xen-br0 10.1.1.1 netmask 255.255.255.0
> > > >
> > > > Frontend net device is disabled in dom0 kernel .config.
> > > >
> > > > Could someone explain what is veth0 and its purpose?
> > > >
> > > > Thanks,
> > > > --
> > > > Takeshi
> > > >
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> > - --
> >
> > "There are 10 types of people in the world: Those who understand binary
> > and those that don't."
> >
> > $>whoami: Carl Holtje
> > $>mail holtje: cwh0803@xxxxxxxxxx
> > $>cu: http://www.cs.rit.edu/~cwh0803
> > $>whois holtje:
> > Segmentation Fault
> > $>
> >
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-- 
Takeshi

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