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[Xen-users] Dom0 network UP but not RUNNING (openSUSE 10.2)

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Dom0 network UP but not RUNNING (openSUSE 10.2)
From: pcu-m@xxxxxxxxx
Date: Mon, 1 Jan 2007 22:32:53 +0100
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After installing Xen from openSUSE 10.2 rpm (3.0.3_11774-20) and 
successfully starting Dom0, I lose all access to the network.

I have found a work around, but that's all what it is: just a work 
around. The root cause remains unclear to me. I hope my message will 
be the start of finding the real cause. I am of course willing to 
provide more information and help debugging if necessary.

After quite some digging, I have come to the conclusion that the 
reason for having no network access at all is the following:

# ifconfig peth0
peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST NOARP  MTU:1500  Metric:1
          RX packets:9684 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6396 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:12095362 (11.5 Mb)  TX bytes:465140 (454.2 Kb)
          Interrupt:17 Base address:0xc800

The link is UP, but nor RUNNING. In this situation, pinging to a 
locally connected device gives "Destination Host Unreachable":

# ping -c1 10.0.0.138
PING 10.0.0.138 (10.0.0.138) 56(84) bytes of data.
From 10.0.0.5: icmp_seq=1 Destination Host Unreachable

--- 10.0.0.138 ping statistics ---
1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 
0ms


The work around that I found is bringing the link down and, after a 
few seconds, bring it up again:

# ip link set peth0 down; sleep 3; ip link set peth0 up

After a few seconds, the state of the link is UP and RUNNING:

peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:9691 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6404 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:12095923 (11.5 Mb)  TX bytes:465573 (454.6 Kb)
          Interrupt:17 Base address:0xc800

Im this state the network works fine, locally and to the outside 
world.

Stopping the Xen bridge with "/etc/xen/scripts/network-bridge stop" 
brings the link (now called eth0) in a similar state as above: up, 
but not running. The same trick works here too: bring eth0 down, wait 
a few seconds and bring it up again. In this case, also the default 
route needs to be restored: ip route add to default via 10.0.0.138


The hardware I'm using is:

CPU:
Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz

The ethernet device is integrated in the motherboard:
ALi Corporation ULi 1689,1573 integrated ethernet. (rev 50)

I'm using SUSE:
openSUSE 10.2 (X86-64) - Kernel 2.6.18.2-34-xen

The Xen configuration is clean out of the box.

Just let me know if more information is needed.


As a side note: as I was (and still am) not quite sure about the 
meaning of UP and RUNNING in the output of ifconfig, I found this 
after some googling: 

http://lists.freebsd.org/pipermail/freebsd-hackers/2004-August/007817.html

Quote:
As a matter of fact, the IFF_RUNNING flag, visible as ``RUNNING'' in
the output from ifconfig(8), is intended for interface's internal use
and should not influence the interaction of the interface with other
modules, except for affecting careful user's experience :-)
EndQuote

I don't know if this is BSD behavior only. It is at least not the 
behavior I see.

-- 
Paul.

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