[Xen-users] CentOS Update broke netowrking for my DomU

["Stuart Rench" <Stuart.Rench@xxxxxxxxxxxx>]

I (stupidly) accepted some recommended yum updates this AM, and now networking no longer works on my DomU.

what works:
Ping Dom0->DomU
Ping DomU->Dom0
SSH, etc Dom0->DomU
SSH, etc DomU->Dom0
Anything Dom0->(internet, intranet)


What doesn't Work:
Anything DomU->(internet, intranet, including gateway)

Some Information:
Dom0 IP: 10.0.0.12
DomU IP: 10.0.0.13
Gateway IP: 10.0.0.1

Ifconfig on Dom0:
eth0 Link encap:Ethernet HWaddr 00:1D:09:29:80:41
inet addr:10.0.0.12 Bcast:10.0.0.255 Mask:255.255.255.0
inet6 addr: fe80::21d:9ff:fe29:8041/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:34280 errors:0 dropped:0 overruns:0 frame:0
TX packets:6328 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2715685 (2.5 MiB) TX bytes:1129440 (1.0 MiB)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:175995 errors:0 dropped:0 overruns:0 frame:0
TX packets:175995 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1458529370 (1.3 GiB) TX bytes:1458529370 (1.3 GiB)

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:36243 errors:0 dropped:0 overruns:0 frame:0
TX packets:13974 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2996919 (2.8 MiB) TX bytes:1642038 (1.5 MiB)
Interrupt:16 Memory:f8000000-f8012100

vif0.0 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:6355 errors:0 dropped:0 overruns:0 frame:0
TX packets:34293 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1133442 (1.0 MiB) TX bytes:2716465 (2.5 MiB)

vif2.0 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:8193 errors:0 dropped:0 overruns:0 frame:0
TX packets:25228 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:262836 (256.6 KiB) TX bytes:2090694 (1.9 MiB)

virbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:45 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:9726 (9.4 KiB)

xenbr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:28138 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:1852764 (1.7 MiB) TX bytes:0 (0.0 b)



ifconfig on DomU:
eth0 Link encap:Ethernet HWaddr 00:16:3E:5A:E7:02
inet addr:10.0.0.13 Bcast:10.0.0.255 Mask:255.255.255.0
inet6 addr: fe80::216:3eff:fe5a:e702/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:25413 errors:0 dropped:0 overruns:0 frame:0
TX packets:8264 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2107073 (2.0 MiB) TX bytes:383700 (374.7 KiB)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2467 errors:0 dropped:0 overruns:0 frame:0
TX packets:2467 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2188196 (2.0 MiB) TX bytes:2188196 (2.0 MiB)



brctl show (on Dom0)
bridge name bridge id STP enabled interfaces
virbr0 8000.000000000000 no
xenbr0 8000.feffffffffff no vif2.0
peth0
vif0.0


route (on Dom0)
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.0.0.0 * 255.255.255.0 U 0 0 0 eth0
192.168.122.0 * 255.255.255.0 U 0 0 0 virbr0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
default 10.0.0.1 0.0.0.0 UG 0 0 0 eth0


Any ideas what could be stopping traffic?

 

I have stopped iptables (service iptables stop), however, stopping iptables causes Dom0 networking to stop responding after a few minutes!?!!?

after a quick reboot, this is what i see on Dom0:
service iptables status
Table: nat
Chain PREROUTING (policy ACCEPT)
num target prot opt source destination

Chain POSTROUTING (policy ACCEPT)
num target prot opt source destination
1 MASQUERADE all -- 192.168.122.0/24 0.0.0.0/0

Chain OUTPUT (policy ACCEPT)
num target prot opt source destination

Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:53
2 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:53
3 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:67
4 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:67

Chain FORWARD (policy ACCEPT)
num target prot opt source destination
1 ACCEPT all -- 0.0.0.0/0 192.168.122.0/24 state RELATED,ESTABLISHED
2 ACCEPT all -- 192.168.122.0/24 0.0.0.0/0
3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
4 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
5 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
6 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 PHYSDEV match --physdev-in vif1.0

Chain OUTPUT (policy ACCEPT)
num target prot opt source destination

 

Thanks for any suggestions you might have!

 

/stuart

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