Re: [Xen-users] hotplugging network

["Maxime Drouet" <maxime.drouet@xxxxxxxxx>]

When the machine is booted : 
tcpdump -i peth1 or tcpdump -i xenbr0 says :
When I try to ping another machine on my network (192.168.1.30) :
arp who-has 192.168.1.30 tell 192.168.1.50
arp reply 192.168.1.30 is at xx:xx:xx:xx:xx

unplugging and pluggin cable,

Well tcpdump -i peth1 or tcpdump -i xenbr0 says :
When I try to ping another machine on my network (192.168.1.30) :
arp who-has 192.168.1.30 tell 192.168.1.50
arp who-has 192.168.1.30 tell 192.168.1.50
arp who-has 192.168.1.30 tell 192.168.1.50 
...

When I try to ping 192.168.1.50 from 192.168.1.30 :
no message

That's quite bizzare ;-)

Max

2008/3/9, Pim van Riezen <pi@xxxxxxxxxxxx>:

That looks fine. Anything interesting to see in tcpdump on either xenbr0 or peth1 when you try to ping the other side?


Pi
-----Original Message-----
From: "Maxime Drouet" <maxime.drouet@xxxxxxxxx>

Date: Sun, 9 Mar 2008 20:12:47
To:"Pim van Riezen" <pi@xxxxxxxxxxxx>
Subject: Re: [Xen-users] hotplugging network

Hi, Thanks for your answer,

when i unplug the cable, I got this msg in dmsg :
skge peth1: Link is down
xenbr0: port 2(peth1) entering disabled state

When I plug it, it says :
skge peth1: Link is down
xenbr0: port 2(peth1) entering disabled state
  xenbr0: port 2(peth1) entering topology change detected, propagating
xenbr0: port 2(peth1) entering forwading state

I think these messages are normal because I got another computer with xen, on which I don't have the problem and the same messages are displayed

the command brctl show says :
  bridge name   bridge id             STP enabled          interfaces
xenbr0        8000.feffffffffff     no                   vif0.0
                                                           peth1




2008/3/9, Pim van Riezen <pi@xxxxxxxxxxxx: <mailto:pi@xxxxxxxxxxxx> >: Hi,


  It could be an issue with the bridging. Take a good look at:

  * dmesg
  * brctl

  There may be some clues there. Also looking at the interfaces with tcpdump may provide you some clues.

  Good luck.

  Pi

-----Original Message-----

From: "Maxime Drouet" <maxime.drouet@xxxxxxxxx: <mailto:maxime.drouet@xxxxxxxxx> >
  Date: Sun, 9 Mar 2008 19:37:23

To:xen-users@xxxxxxxxxxxxxxxxxxx: <mailto:To:xen-users@xxxxxxxxxxxxxxxxxxx>
  Subject: [Xen-users] hotplugging network

  Hello everyone,

  First of all sorry for my frenglish.

  I got a problem on one of my xen servers, when I un-plug and plug the network cable, I can't ping another computer of my private network from dom0 or domU.
    It's really weard, because when I reboot the server on a kernel wich doesn't run on xen, I don't have the problem.

  Do you have any ideas on how to solve this ?

  I run xen on a debian etch.

   Thanks for your help,

  Maxime

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