All,
I''d appreciate help diagnosing the following problem I''m
having getting
networking under Xen working.
First, I have this exact same setup working on other types of hosts, so
something specific to this type of host, Appro S1321, is causing the
problem. Also, I have tried it on three different hosts of this same
model, with the exact same results.
So, here''s the setup:
Appro S1321 host
32GB RAM
2x AMD Opteron 285
2x Broadcom BCM5721 NICs (tg3 driver in dom0)
OS: OVM Server v. 2.2.1
Xen 3.4.0
When booting the system clean, the interfaces and routes look like this:
eth0 Link encap:Ethernet HWaddr 00:D0:68:10:00:D1
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:248 errors:0 dropped:0 overruns:0 frame:0
TX packets:247 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:41596 (40.6 KiB) TX bytes:32460 (31.6 KiB)
Interrupt:21
eth1 Link encap:Ethernet HWaddr 00:D0:68:10:00:D0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:22
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:166 errors:0 dropped:0 overruns:0 frame:0
TX packets:166 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:20533 (20.0 KiB) TX bytes:20533 (20.0 KiB)
xenbr0 Link encap:Ethernet HWaddr 00:D0:68:10:00:D1
inet addr:10.12.12.110 Bcast:0.0.0.0 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:315 errors:0 dropped:0 overruns:0 frame:0
TX packets:317 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:52156 (50.9 KiB) TX bytes:39120 (38.2 KiB)
xenbr1 Link encap:Ethernet HWaddr 00:D0:68:10:00:D0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 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:0 (0.0 b) TX bytes:0 (0.0 b)
Destination Gateway Genmask Flags Metric Ref Use Iface
10.12.12.0 0.0.0.0 255.255.255.0 U 0 0 0
xenbr0
0.0.0.0 10.12.12.1 0.0.0.0 UG 0 0 0
xenbr0
When I start a guest, it creates vif1.0, as:
vif1.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:1156 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
And adds the vif to the bridge:
bridge name bridge id STP enabled interfaces
xenbr0 8000.00d0681000d1 no vif1.0
eth0
xenbr1 8000.00d0681000d0 no eth1
The problem, is that the dom0 OS can ping/otherwise-connect-to the domU,
and visa-versa, but the domU cannot get to the outside world.
If I try to ping the domU from another host on the same subnet (on a dumb
switch, nothing fancy), I get no response at all.
Tcpdumping eth0/xenbr0 on dom0 doesn''t even show the icmp requests
coming
in. I have run "ifconfig eth0 promisc", and this does not help.
On a fancier switch, I spanned the system''s network port to another
host,
and ran tcpdump on that. From there, I can see the ICMP requests coming
in, so I know it''s not some MAC-table mix-up on the switch.
If, before starting the guest VM, I run "/etc/init.d/network restart",
then start the guest, networking will actually work for it, for a short
time (~1 min). All I can see that this accomplishes is shutting down the
eth1 nic, and assigning the xenbr0 IP address to eth0. If I do this
manually, nothing useful happens.
Any ideas? As I said before, I have this exact same software setup working
on other machine types. Even the same VM image will work on another
machine...
Thanks,
Erik Burrows
--
If you are flammable and have legs, you''re never blocking a fire exit.
-Mitch Hedberg
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