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

[David F Barrera <dfbp@xxxxxxxxxx>]

On Mon, 2005-10-17 at 22:29 +0200, 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 ??
Actually peth0 (I have a blade that has two NICs, but I am using eth1,
so it shows peth1).
> 
> Take a look at your ifconfig output. Maybe there are two 
> Virtual-Interfaces witch the same MAC.
Right on. vif0.0 and vif1.1 (vif1.1 and xen-br0, too) have the same
HWaddr. But why? I there some configuration I need to do?

# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:11:25:3E:39:F2
          inet addr:9.3.189.44  Bcast:9.3.189.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:133688 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1956 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:61267457 (58.4 Mb)  TX bytes:1010478 (986.7 Kb)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:20444177 errors:0 dropped:0 overruns:0 frame:0
          TX packets:20444177 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2151657391 (2051.9 Mb)  TX bytes:2151657391 (2051.9
Mb)

peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:152597 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2861 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:71081525 (67.7 Mb)  TX bytes:1507449 (1.4 Mb)
          Interrupt:24

vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1956 errors:0 dropped:0 overruns:0 frame:0
          TX packets:133688 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1010478 (986.7 Kb)  TX bytes:61267457 (58.4 Mb)

vif1.1    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:913 errors:0 dropped:0 overruns:0 frame:0
          TX packets:131949 errors:0 dropped:244 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:485625 (474.2 Kb)  TX bytes:60965539 (58.1 Mb)

xen-br0   Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:70489 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:6514187 (6.2 Mb)  TX bytes:0 (0.0 b)

> 
> Arnd
> 
> 
>       
> 
>       
>               
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-- 
Regards,

David F Barrera
Linux Technology Center
Systems and Technology Group, IBM

"The wisest men follow their own direction. "
                                                        Euripides


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