Re: [Xen-users] domU network doesn't get IP

[Jayesh Salvi <jayeshsalvi@xxxxxxxxx>]

Hi,
I resolved this issue. I could not get it working using network-bridge script, but NAT worked.

So I changed the xend-config.sxp so that it would execute:
(network-script network-nat)
(vif-script     vif-nat)

Restarted xend, launched domU.

I found that this script uses dhcp and vif interface got an IP address when seen from dom0. i.e. 'route -n' from dom0 shows:
[root@orion ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.0.8.1        0.0.0.0         255.255.255.255
 UH    0      0        0 vif8.0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
24.118.198.0    0.0.0.0         255.255.254.0   U     0      0        0 eth0
169.254.0.0     
0.0.0.0         255.255.0.0     U     0      0        0 eth0
0.0.0.0         24.118.198.1    
0.0.0.0         UG    0      0        0 eth0

And I can ping to 10.0.8.1  even though my domU doesn't have its IP yet.

When I booted domU however it did not get the IP address at boot time.
Determining IP information for eth0... failed.
[FAILED]

ifconfig showed eth0, but with now ip.
So I manually assigned IP to eth0 by running: ifconfig eth0 10.0.8.1 netmask 
255.255.255.0
Further I added a route in the IP routing table:
route add -net 0.0.0.0 netmask 0.0.0.0 gw 10.0.8.1
So now my IP table looks like:
[root@localhost ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.0.8.0        0.0.0.0
         255.255.255.0   U     0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0
     U     0      0        0 lo
0.0.0.0         10.0.8.1        0.0.0.0         UG    0      0        0 eth0

Now I can ping to dom0 from domU, as well as I can ping to IPs of google and yahoo. So now domU can see the world.

Interesting thing is, if I assign an IP of 10.0.8.20 to eth0 in domU and add a route 'route add -net 0.0.0.0 netmask 0.0.0.0
 gw 10.0.8.1', that doesn't work. pings won't work to dom0. I will figure that out later.

Thanks for all the suggestions.

Jayesh
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