[Xen-users] Xen 3: Functional NAT Possible?

[Jeff Utter <jeffutter.lists@xxxxxxxxx>]

Hi,

	I have been trying for days now to get a working nat setup with my 
domU's using the default nat scripts.
I find the biggest problem being that each time a new domU is started, 
it gets thrown on a separate subnet.
Here is an example of dom0's network setup with 2 vm's started:

vif1.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet addr:10.0.1.128  Bcast:0.0.0.0  Mask:255.255.255.255
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8601 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8932 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1997282 (1.9 MiB)  TX bytes:2003904 (1.9 MiB)

vif9.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet addr:10.0.9.128  Bcast:0.0.0.0  Mask:255.255.255.255
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2 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:684 (684.0 b)  TX bytes:0 (0.0 b)

domU-1 :

eth0      Link encap:Ethernet  HWaddr 00:50:22:22:22:01
          inet addr:10.0.1.1  Bcast:10.0.255.255  Mask:255.255.0.0

domU-2 (default)

eth0      Link encap:Ethernet  HWaddr 00:50:22:22:22:02
          inet addr:10.0.9.1  Bcast:10.0.255.255  Mask:255.255.255.0

domU-2 (via dhcp)

eth0      Link encap:Ethernet  HWaddr 00:50:22:22:22:02
          inet addr:10.0.1.1  Bcast:10.0.255.255  Mask:255.255.0.0

my dhcpd conf:

subnet 10.0.0.0 netmask 255.255.0.0 {
  range 10.0.1.10 10.0.1.100;
  option routers 10.0.1.128;
  option ip-forwarding off;
  option broadcast-address 10.0.255.255;
  option subnet-mask 255.255.0.0;
  option domain-name-servers 10.0.1.128;
  host mailserver {
    hardware ethernet 00:50:22:22:22:01;
    fixed-address 10.0.1.1;
  }
  host webserver {
    hardware ethernet 00:50:22:22:22:02;
    fixed-address 10.0.1.2;
  }
}


The problem is, no matter what i do, the interface for the domU on my 
dom0 gets ips in different subnets, therefore they can't talk to each 
other and each domU requires a different gateway.. is there any way 
around this, it is getting very frustrating.
Thanks,
Jeff

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