FAQ
I have a server running Centos 5.2 as a Xen host. A problem that's
shown up recently is that at boot, the dom0 interface eth0 doesn't come
up properly, with the result that the host is only accessible via remote
console. If I execute 'service network restart', eth0 comes up
normally, with an IP address and the correct routing.

Three guests have been created via virt-manager and I haven't changed
any of the defaults, so I'm not sure what's causing this.

Here's ifconfig output after boot:

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:20 errors:0 dropped:0 overruns:0 frame:0
TX packets:20 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1308 (1.2 KiB) TX bytes:1308 (1.2 KiB)

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:31844 errors:0 dropped:0 overruns:0 frame:0
TX packets:15 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4639017 (4.4 MiB) TX bytes:4898 (4.7 KiB)
Interrupt:16 Memory:da000000-da012100

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:24 errors:0 dropped:0 overruns:0 frame:0
TX packets:31489 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:6891 (6.7 KiB) TX bytes:4490222 (4.2 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:84 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:16250 (15.8 KiB)

xenbr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:31060 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:4035093 (3.8 MiB) TX bytes:0 (0.0 b)

and again once I've restarted networking and have a guest running:

eth0 Link encap:Ethernet HWaddr 00:1E:C9:CD:C7:0A
inet addr:10.99.91.151 Bcast:10.99.255.255 Mask:255.255.0.0
inet6 addr: fe80::21e:c9ff:fecd:c70a/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:15836 errors:0 dropped:0 overruns:0 frame:0
TX packets:10303 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2136620 (2.0 MiB) TX bytes:33113077 (31.5 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:6676 errors:0 dropped:0 overruns:0 frame:0
TX packets:6676 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:33006844 (31.4 MiB) TX bytes:33006844 (31.4 MiB)

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:63781 errors:0 dropped:0 overruns:0 frame:0
TX packets:27001 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:9142626 (8.7 MiB) TX bytes:34301305 (32.7 MiB)
Interrupt:16 Memory:da000000-da012100

tap0 Link encap:Ethernet HWaddr F2:C4:14:A0:43:50
inet6 addr: fe80::f0c4:14ff:fea0:4350/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:26853 errors:0 dropped:0 overruns:442 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 b) TX bytes:25995823 (24.7 MiB)

tap1 Link encap:Ethernet HWaddr 96:9D:94:41:A1:C9
inet6 addr: fe80::949d:94ff:fe41:a1c9/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:26851 errors:0 dropped:0 overruns:443 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 b) TX bytes:25995669 (24.7 MiB)

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:10327 errors:0 dropped:0 overruns:0 frame:0
TX packets:63318 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:33119968 (31.5 MiB) TX bytes:8871385 (8.4 MiB)

vif1.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST NOARP 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:32
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

vif1.1 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:16 errors:0 dropped:0 overruns:0 frame:0
TX packets:8820 errors:0 dropped:1 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:1584 (1.5 KiB) TX bytes:24001390 (22.8 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:35 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:10384 (10.1 KiB)

xenbr0 Link encap:Ethernet HWaddr 96:9D:94:41:A1:C9
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:53695 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:6909244 (6.5 MiB) TX bytes:0 (0.0 b)

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  • Kai Schaetzl at Dec 15, 2008 at 3:31 pm

    Adam Huffman wrote on Mon, 15 Dec 2008 14:21:36 +0000:

    If I execute 'service network restart', eth0 comes up
    normally, with an IP address and the correct routing.
    The network-scripts in the default CentOS Xen are buggy. For instance, I
    found that when you have two IPs with different subnets configured for
    Dom0 the DomUs won't be able to get an IP from your normal DHCP server.
    (Compare discussion on this list quite some time back.) I didn't see a
    problem with the network of the Dom0, though.
    Check dmesg and other logs for any bootup errors. Make sure that your
    network setup on the machine is 100% correct and all subnets have a
    dedicated gateway. Something that isn't 100% correct, but normally works,
    may not work with these network scripts.
    I went to Xen 3.2 which has a completely revamped network/bridging
    structure.

    Kai

    --
    Kai Sch?tzl, Berlin, Germany
    Get your web at Conactive Internet Services: http://www.conactive.com

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postedDec 15, '08 at 2:21p
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