Re: Xen Networking Issue with CentOS 5.1

"Gary Richardson" <gary.richardson@xxxxxxxxx> · Fri, 28 Dec 2007 08:00:07 -0800

I think, but don't know for a fact, that if you don't specify a bridge interface in your config, you'll get a 'nat' address in your domU. I posted about it in my blog: 
http://yablog-gary.blogspot.com/2007/12/xen-what-i-learned-today.html -- maybe that will get you on the right track?
thanks.

On Dec 27, 2007 5:19 PM, Joseph L. Casale <
jcasale@xxxxxxxxxxxxxxxxx> wrote:
Hi,
I tried this post on the Xen list first with no answer. I have 4 machines and 3 of which (all different) have no network access when booted into Xen. I tried using Fedora Core 8 and it produced the same results. Is it normal for the virbr0 interface to take an arbitrary IP? How does it decide what to use? An ifconfig when booted into Xen shows the following:

eth0      Link encap:Ethernet  HWaddr 00:0C:29:4A:69:63
          inet addr:192.168.5.30  Bcast:192.168.5.255
  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe4a:6963/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:25 errors:0 dropped:0 overruns:0 frame:0

          TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1763 (1.7 KiB)  TX bytes:594 (594.0 b)

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:3 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:336 (336.0 b)  TX bytes:336 (336.0
 b)

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:28 errors:0 dropped:0 overruns:0 frame:0

          TX packets:21 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1943 (1.8 KiB)  TX bytes:1314 (1.2 KiB)
          Interrupt:17 Base address:0x1400

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:9 errors:0 dropped:0 overruns:0 frame:0

          TX packets:25 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:594 (594.0 b)  TX bytes:1763 (1.7 KiB)

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:6 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:468 (468.0 b)

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:34 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:1881 (1.8 KiB)  TX bytes:0 (0.0 b)

Thanks for any pointers!
jlc

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