Networking problem in domUs

[David F Barrera <dfbp@us.ibm.com>]

I've been having issues with domU networking on an IBM xSeries 460. It
is running several guest domains, and most, but not all, of them are
having networking problems. These guest domains HAVE worked properly in
the past, so it is unlikely a setup problem. 


HW:
IBM xSeries 460, SAS drives, 8GB of RAM
0000:0f:01.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5704 Gigabit
Ethernet (rev 10)
Distro: SLES 9 SP2

changeset:   8833:39b392a22002 (and 8830 before that)
tag:         tip
user:        kaf24@firebug.cl.cam.ac.uk
date:        Tue Feb 14 12:43:45 2006 +0100
summary:     Fix segment-register dumping in show_registers()

For example, when I ping one of them:
x366-xentest:/skyline/barrera/xm-test # ping x460-xentest-vm8
PING x460-xentest-vm8.ltc.austin.ibm.com (9.3.190.126) 56(84) bytes of data.
64 bytes from x460-xentest-vm8.ltc.austin.ibm.com (9.3.190.126): icmp_seq=1
ttl=63 time=0.609 ms
wrong data byte #22 should be 0x16 but was 0x0
#16     10 11 12 13 14 15 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#48     0 0 0 0 0 0 0 0
64 bytes from x460-xentest-vm8.ltc.austin.ibm.com (9.3.190.126): icmp_seq=2
ttl=63 time=0.592 ms
wrong data byte #22 should be 0x16 but was 0x0
#16     10 11 12 13 14 15 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#48     0 0 0 0 0 0 0 0
64 bytes from x460-xentest-vm8.ltc.austin.ibm.com (9.3.190.126): icmp_seq=3
ttl=63 time=0.533 ms
wrong data byte #22 should be 0x16 but was 0x0
#16     10 11 12 13 14 15 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#48     0 0 0 0 0 0 0 0

----
vm8 is configured properly:
[root@x460-xentest-vm8 ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:16:3E:51:9D:72
          inet addr:9.3.190.126  Bcast:9.3.190.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:12165 errors:0 dropped:0 overruns:0 frame:0
          TX packets:342 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1408961 (1.3 MiB)  TX bytes:54400 (53.1 KiB)
 
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:22 errors:0 dropped:0 overruns:0 frame:0
          TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1672 (1.6 KiB)  TX bytes:1672 (1.6 KiB)

The networking on the guest domain is set up properly; however, I can't ssh or ping any machines.
Out of roughly 10 guest domains, only a couple have functioning networking.
Again, this setup has worked in the past.


-- 
Regards,

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

"The wisest men follow their own direction. "
                                                        Euripides