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

[Ted Kaczmarek <tedkaz@xxxxxxxxxxxxx>]

On Mon, 2005-10-17 at 17:36 -0700, Nivedita Singhvi wrote:
> Ted Kaczmarek wrote:
> 
> >>It happens consistently.
> >>
> >>The no arp issue may be masking something else, you really want the
> >>bridge to respond for arps for nodes behind it, otherwise all ports must
> >>get flooded.
> >>
> >>
> > 
> >  My bad, mixing up arp snooping here, the arps must always be flooded.
> > Been mulling this, peth0 is the bridge id, but without spanning tree
> > running should not be doing anything. Ian also stated this when I first
> > brought this up.
> 
> Er, peth0 is the physical interface - not sure what you mean by
> "is the bridge id", Ted?
> 
> > Has anyone captured this packet/frame yet? 
> 
> Timezone delay ;). Tmrw morning..
> 
> > That would likely explain a lot.
> 
> Yep. I'll try and repro tonight if possible, or just catch one
> of the guys on irc who are seeing it if they're around..
> 
> thanks,
> Nivedita
brctl show

bridge name     bridge id               STP enabled     interfaces
xen-br0         8000.feffffffffff       no              peth0
                     ^^^^^^^^^^^^ 

The bridges id is comprised of the mac address of the parent and the
preamble.

xen-br1         8000.00e081053c6d       no              eth1
                     ^^^^^^^^^^^^ 

eth1      Link encap:Ethernet  HWaddr 00:E0:81:05:3C:6D

                

brctl showmacs xen-br0
port no mac addr                is local?       ageing timer
  2     00:0c:f1:c9:6d:62       no               163.43
  2     00:60:97:bd:e5:af       no                 1.89
  2     00:90:f5:24:a8:13       no                 0.00
  2     00:b0:d0:07:0a:d1       no                 6.65
  1     00:e0:81:05:3c:6c       no                 0.00<<<<<<<<<
  9     aa:00:00:00:00:17       no                21.71
  2     aa:00:66:00:01:03       no                 0.12
  4     aa:00:66:00:01:07       no                25.57
  3     aa:00:66:00:01:08       no                 0.78
 14     aa:bb:bb:00:01:01       no                 7.38
 11     aa:bb:bb:00:01:02       no                 0.11
 12     aa:bb:bb:00:01:03       no                15.80
  8     aa:bb:bb:15:15:15       no                22.16
  6     aa:bb:bb:16:16:16       no                14.23
  7     aa:bb:bb:55:55:55       no                 7.82
  5     aa:bb:bb:66:66:66       no                15.34
  1     fe:ff:ff:ff:ff:ff       yes                0.00<<<<<<<<<

ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:E0:81:05:3C:6C

So if peth0 is a physical interface and eth0 is a physical interface
with xen I get a free nic card, just kidding.

What is the function of the peth0?

Say one doesn't want to use pethX at all, is that even possible?
I couldn't get vifs to map correctly when I tried, but that could just
be something still not implemented or a bug.


Regards,
Ted








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