Re: [Xen-devel] peth1: received packet with own address as source address

[Andrew Theurer <habanero@xxxxxxxxxx>]

Arnd Schmitter wrote:

> David F Barrera wrote:
>
> > On Mon, 2005-10-17 at 20:50 +0200, Arnd Schmitter wrote:
> >  
> >
> > > David F Barrera wrote:
> > >    
> > >
> > > > peth1: received packet with  own address as source address
> > > >
> > > > Is this something that I should care about? I don't see an obvious
> > > > impact to the machine.          
> > > This means normaly two things: Packets you send out are returning or 
> > > there is another PC with the same address.
> > > The Linuxkernel drops this packets as he think its a knd of address 
> > > spoofing.
> > > If all networking is working fine you will only have a minimal 
> > > impact on performance. But it could indicate that something with 
> > > your network configuration is wrong
> > >     
> > Arnd, thanks for your response. My network configuration appears to be
> > OK; it is simple, one NIC and its IP address, and everything seems to be
> > working well. Also, there are no two machines with the same address. So,
> > I am wondering if this is a problem with Xen. I have opened up a
> > bugzilla report, as I would like to have a definitive answer as to
> > whether this is a bug or a network configuration issue.
> >
> > http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=339
> >   
> Only one NIC and peth1 ??
>
> Take a look at your ifconfig output. Maybe there are two 
> Virtual-Interfaces witch the same MAC.
Unless the network-bridge script has changed the generated mac for eth0 
(which gets renamed to peth0), all systems probably have the same mac 
for peth0 & xen-br0: fe:ff:ff:ff:ff:ff.  I have tried using unique macs 
(for just peth0, vif0.0, and xen-br0, other vifs still have fe:ff...), 
and these messages disappear.  So, why would the mac for a veth0 or 
xen-br0 get sent to another system?  Not sure, since they should not 
have an ip address, and should not respond to an arp request.  I do 
notice that peth0 has 'noarp' but xen-br0 does not.  Perhaps adding 
noarp to xen-br0 will fix this.
-Andrew


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