[Xen-users] network is only connected for a while when the domU is started

[王卅 <sooner1943@xxxxxxxxx>]

Hi ALL,

Here is a weird problem comfusing me for a long time. i'v installed xen 4.0.1 with linux kernel 3.1.0-rc9+

Everything works fine except i cannot ping to the gateway in a PVM domU. i'v installed bridge-utils and brctl show like this

bridge  name         bridge id                      STP          enabled interfaces

eth0                      8000.00219b480d56     no             peth0

                                                                               vif11.0

virbr0                     8000.000000000000     yes

The domU is supposed to get a IP from a DHCP server in our network so i can access to it from any node in that network.

i made the eth0 bridge as a switch and the domU could access to the DHCP server across it. it works fine on a HVM domU.

The most weird part is the PVM could get an IP address every time i start it and i could ping to the gateway too. But after just a few minutes, the ping process is stuck, and the host become unreacheable. At the same time, i restart the network, and the eth0 in domU could not get an IP address.

i post the output here:

133.133.133.40 is the IP address of gateway

133.133.134.171 is the IP address of the PVM domU

[root@localhost ~]# ping 133.133.133.40

PING 133.133.133.40 (133.133.133.40) 56(84) bytes of data.

64 bytes from 133.133.133.40: icmp_seq=1 ttl=64 time=0.824 ms

64 bytes from 133.133.133.40: icmp_seq=2 ttl=64 time=0.491 ms

64 bytes from 133.133.133.40: icmp_seq=3 ttl=64 time=0.495 ms

64 bytes from 133.133.133.40: icmp_seq=4 ttl=64 time=0.437 ms

64 bytes from 133.133.133.40: icmp_seq=5 ttl=64 time=0.459 ms

64 bytes from 133.133.133.40: icmp_seq=6 ttl=64 time=1.16 ms

64 bytes from 133.133.133.40: icmp_seq=7 ttl=64 time=0.454 ms

64 bytes from 133.133.133.40: icmp_seq=8 ttl=64 time=0.454 ms

64 bytes from 133.133.133.40: icmp_seq=9 ttl=64 time=0.528 ms

64 bytes from 133.133.133.40: icmp_seq=10 ttl=64 time=0.447 ms

64 bytes from 133.133.133.40: icmp_seq=11 ttl=64 time=0.505 ms

64 bytes from 133.133.133.40: icmp_seq=12 ttl=64 time=0.398 ms

64 bytes from 133.133.133.40: icmp_seq=13 ttl=64 time=0.452 ms

64 bytes from 133.133.133.40: icmp_seq=14 ttl=64 time=0.504 ms

64 bytes from 133.133.133.40: icmp_seq=15 ttl=64 time=0.456 ms

64 bytes from 133.133.133.40: icmp_seq=16 ttl=64 time=0.451 ms

64 bytes from 133.133.133.40: icmp_seq=17 ttl=64 time=0.501 ms

64 bytes from 133.133.133.40: icmp_seq=18 ttl=64 time=0.446 ms

64 bytes from 133.133.133.40: icmp_seq=19 ttl=64 time=0.373 ms

64 bytes from 133.133.133.40: icmp_seq=20 ttl=64 time=0.413 ms

64 bytes from 133.133.133.40: icmp_seq=21 ttl=64 time=0.495 ms

64 bytes from 133.133.133.40: icmp_seq=22 ttl=64 time=0.452 ms

64 bytes from 133.133.133.40: icmp_seq=23 ttl=64 time=0.407 ms

64 bytes from 133.133.133.40: icmp_seq=24 ttl=64 time=0.505 ms

64 bytes from 133.133.133.40: icmp_seq=25 ttl=64 time=0.471 ms

64 bytes from 133.133.133.40: icmp_seq=26 ttl=64 time=0.458 ms

64 bytes from 133.133.133.40: icmp_seq=27 ttl=64 time=0.453 ms

64 bytes from 133.133.133.40: icmp_seq=28 ttl=64 time=0.453 ms

64 bytes from 133.133.133.40: icmp_seq=29 ttl=64 time=0.456 ms

64 bytes from 133.133.133.40: icmp_seq=30 ttl=64 time=0.454 ms

64 bytes from 133.133.133.40: icmp_seq=31 ttl=64 time=0.424 ms

From 133.133.134.171 icmp_seq=85 Destination Host Unreachable

From 133.133.134.171 icmp_seq=86 Destination Host Unreachable

From 133.133.134.171 icmp_seq=87 Destination Host Unreachable

From 133.133.134.171 icmp_seq=89 Destination Host Unreachable

From 133.133.134.171 icmp_seq=90 Destination Host Unreachable

From 133.133.134.171 icmp_seq=91 Destination Host Unreachable

i also post my configuration of PVM domU here:

<domain type='xen' id='12'>

<name>centos-para</name>

<uuid>67256e52-ac7d-a95e-fd58-8114475e454e</uuid>

<memory>1048576</memory>

<currentMemory>1048576</currentMemory>

<vcpu>1</vcpu>

<bootloader>/usr/bin/pygrub</bootloader>

<os>

<type>linux</type>

</os>

<clock offset='utc'/>

<on_poweroff>destroy</on_poweroff>

<on_reboot>restart</on_reboot>

<on_crash>restart</on_crash>

<devices>

<disk type='file' device='disk'>

<driver name='file'/>

<source file='/root/vm/centos-para/centos-para.img'/>

<target dev='xvda' bus='xen'/>

</disk>

<interface type='bridge'>

<mac address='00:16:3e:29:e4:9c'/>

<source bridge='eth0'/>

<script path='/etc/xen/scripts/vif-bridge'/>

<target dev='vif12.0'/>

</interface>

<console type='pty' tty='/dev/pts/2'>

<source path='/dev/pts/2'/>

<target port='0'/>

</console>

</devices>

</domain>

is there anyone could help me please？ i‘v googled lots of stuff but nothing helped.

sa wang

2012-06-07

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Wang Sa（王卅）,Ph,D candidate

Technology Center of Software Engineering

Institute of Software, Chinese Academy of Sciences

P.O.Box 8718, Beijing 100190, China

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