No route to localhost in virtual domains

[Ivan Peikov <vanio@netclime.com>]

Hi!
I'm running Xen 2.0.4 over patched 2.6.10 kernel and have problem with routing 
to loopback interface in virtual domains (can't ping 127.0.0.1). Here is how 
it looks:

--------------
root@vm1:/tmp# ifconfig
eth0      Link encap:Ethernet  HWaddr AA:00:00:5F:BB:9C
          inet addr:192.168.0.101  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:171856 errors:0 dropped:0 overruns:0 frame:0
          TX packets:160196 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:37456710 (35.7 Mb)  TX bytes:51323199 (48.9 Mb)

lo        Link encap:Local Loopback
          UP LOOPBACK RUNNING  MTU:16436  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:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

root@vm1:/tmp# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     *               255.255.255.0   U     0      0        0 eth0
default         rtr.bg.nc       0.0.0.0         UG    0      0        0 eth0
--------------

When I attempt to add the route manually I get this:

--------------
root@vm1:/tmp# /sbin/route add -net 127.0.0.0 netmask 255.0.0.0 lo
SIOCADDRT: No such device
--------------

Routing through eth0 works fine. 
Should I somehow export the loopback interface to virtual domains and how?

While still on the topic, I'd like to ask another (probably stupid) networking 
question.
I still can't get the dom0's network running. When virtual machines get 
started and xen-br0 bridge gets up, the MAC address of my NIC gets associated 
with the bridge and no matter what I do, I can't route no packets to and from 
dom0's eth0 inteface. All the other virtual domains have no such problem. Any 
idea how do I solve this?

Thanks!!

Regards,
Ivan Peikov



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