[Xen-users] Network problem

["Gino LV. Ledesma" <gledesma@xxxxxxxxx>]

Hi, everyone

I just started with Xen yesterday and have been doing a search through
Google and the mailing lists. So far, I can't seem to get my
networking right (between dom0 and dom1) even though I think I've
followed the right steps.

Background:
Dom0: 192.168.0.1 / 255.255.0.0
Dom1: 192.168.0.2 / 255.255.0.0

Here's what I have on the host OS:
eth0      Link encap:Ethernet  HWaddr 00:0C:29:BA:AC:E0
          inet addr:192.168.0.1  Bcast:192.168.255.255  Mask:255.255.0.0
vif1.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
xen-br0   Link encap:Ethernet  HWaddr 00:0C:29:BA:AC:E0
          inet addr:192.168.0.1  Bcast:192.168.255.255  Mask:255.255.255.255

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     0.0.0.0            255.255.0.0     U     0      0     
  0 xen-br0
0.0.0.0         192.168.254.254    0.0.0.0         UG    0      0     
  0 xen-br0

And on the guest OS:
eth0      Link encap:Ethernet  HWaddr DE:AD:29:BA:AC:EA
          inet addr:192.168.0.2  Bcast:182.168.255.255  Mask:255.255.0.0

In the dom1 config, I've configured vif as follows:
vif = [ 'mac=DE:AD:29:BA:AC:EA, bridge=xen-br0' ]

bridge utils seems to have it correct:

bridge name     bridge id               STP enabled     interfaces
xen-br0         8000.000c29baace0       no              eth0
                                                        vif1.0
I can't even get the guest OS and the host OS to talk to each other.
I've also tried enabling ip_forward but still no dice. I was mucking
around before and managed to get them to talk to each other once, but
from there I couldn't make the guest OS talk to the gateway of the
host OS.

Not sure what I've missed. I'm using xen-2.0.5 on Centos 4 (both host
and guest OSs).

Any advise appreciated.

- gino

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