[Xen-users] Strange Networking Issue

[Jonathon Jones <xen@xxxxxxxxxx>]

I'm having a strange networking issue I am hoping somebody can help me 
solve.  My provider assigned me 9 addresses and 8 of them are on a 
different subnet from the other IP and the gateway.  Here's how it looks:
Gateway: xxx.xxx.153.177
dom0: xxx.xxx.153.178 (on eth1, eth0 is assigned a 10.x.x.x IP.  This is 
how my provider set it up)
dom1: xxx.xxx.154.240 (domU primary IP)
          xxx.xxx.154.241
          xxx.xxx.154.242

dom2: xxx.xxx.154.244 (domU primary IP)
          xxx.xxx.154.245
          xxx.xxx.154.246

In dom1 ip addr list shows the following snippet:
...
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
   link/ether 00:16:3e:6b:a0:ef brd ff:ff:ff:ff:ff:ff
   inet xxx.xxx.154.240/22 brd xxx.xxx.155.255 scope global eth0
   inet xxx.xxx.154.241/32 scope global eth0
   inet xxx.xxx.154.242/32 scope global eth0
   inet6 fe80::216:3eff:fe6b:a0ef/64 scope link
      valid_lft forever preferred_lft forever
...

also in dom1, ifcfg-eth0 looks like this:

TYPE=Ethernet
DEVICE=eth0
BOOTPROTO=static
ONBOOT=yes
IPADDR=xxx.xxx.154.240
NETMASK=255.255.252.0
GATEWAY=xxx.xxx.153.177


.240 is pingable.
.241 was not pingable but somehow i was able to get it pingable and 
don't know how. (I changed /32 to /30 and it started working and then 
now I can change it up however I want and there is no effect, it remains 
pingable)
.242 is not pingable.

By pingable/not pingable I am talking about machines in the outside 
world and the dom0.  dom2 can actually ping any IP from dom1 and visa 
versa.  This leads me to believe that there is a subnet configuration 
issue so only machines on the same subnet can ping the IP's but I can't 
explain how .241 is pingable everywhere.  I've tried removing .242 and 
readding it with /30 or with /22, etc but without success.
dom2 has the same issue except that only .244 is pingable while the 
others are not.
I am completely at a loss in this situation and have spent hours trying 
to get this working.  If any more information is needed, please let me 
know.  I am hoping that my lack of sleep is making me overlook something 
simple that one of you will see.
Thanks in advance,

Jon

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