[Xen-users] Networking problem

[Arsen Hayrapetyan <ahairape@xxxxxxxxxxxx>]

Hello, 

I have created the domU with the IP address 192.168.0.4. Here 
what is in the /etc/xen/xmdefconfig file:
=======================================================================
kernel="/boot/vmlinuz-2.6-xen"
memory=512
extra="fastboot"

#network
vif=['']
dhcp="off"
hostname="compnode"
name="compnode"
ip="192.168.0.4"
netmask="255.255.255.0"

ramdisk="/boot/initrd-2.6-xen.img"
disk=['phy:/dev/hda3,sda1,w','phy:/dev/hda5,sda2,w']
root="/dev/sda1 ro"
=======================================================================

In /etc/xen/xend-config.sxp file I have the following lines uncommented:
===============================
(network-script network-nat)
(vif-script vif-nat)
===============================

Then I have created the domU:
#> xm create -c

In domU I see:
#> ifconfig
=========================================================================
eth0      Link encap:Ethernet  HWaddr 00:16:3E:00:20:93
          inet addr:192.168.0.4  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:294 (294.0 b)
=========================================================================

In dom0 I see:
#> ifconfig
============================================================================
vif5.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet addr:10.0.5.128  Bcast:0.0.0.0  Mask:255.255.255.255
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:7 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:5 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:294 (294.0 b)  TX bytes:0 (0.0 b)
============================================================================

When I change the IP address on vif5.0 I am able to ping from dom0 to domU
and in the reverse direction:

#> ifconfig vif5.0 198.162.0.3
#> ifconfig
=========================================================================
vif5.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet addr:198.162.0.3  Bcast:198.162.0.255  Mask:255.255.255.0
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:7 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:5 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:294 (294.0 b)  TX bytes:0 (0.0 b)
==========================================================================

[In dom0]
#> ping 198.162.0.4
==========================================================
PING 192.168.0.4 (192.168.0.4) 56(84) bytes of data.
64 bytes from 192.168.0.4: icmp_seq=0 ttl=64 time=5.68 ms
64 bytes from 192.168.0.4: icmp_seq=1 ttl=64 time=0.267 ms
64 bytes from 192.168.0.4: icmp_seq=2 ttl=64 time=0.243 ms
64 bytes from 192.168.0.4: icmp_seq=3 ttl=64 time=0.238 ms
...
==========================================================

[In domU]
#> ping 198.162.0.3
===========================================================
PING 192.168.0.3 (192.168.0.3) 56(84) bytes of data.
64 bytes from 192.168.0.3: icmp_seq=0 ttl=64 time=0.235 ms
64 bytes from 192.168.0.3: icmp_seq=1 ttl=64 time=0.590 ms
64 bytes from 192.168.0.3: icmp_seq=2 ttl=64 time=0.649 ms
64 bytes from 192.168.0.3: icmp_seq=3 ttl=64 time=0.212 ms
...
===========================================================

However, when I re-start my domU, the IP address of vifY.0
interface changes to 10.0.Y.128 with netmask 255.255.255.255.

So, the question is: how can I force the vifY.0 have the same
IP address (for example, 192.168.0.3) each time it is created
(with a netmask, different from 255.255.255.255)?

Arsen.

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