[Xen-users] Routing issue?

[Yoav Felberbaum <mailinglists@xxxxxxxxxx>]

Hi,

At first glance, this appears to be a fairly simple routing issue,  
but I've checked the configuration and am a bit mystified. I am using  
Xen 3.0.2 here in bridged networking mode.
Firstly - four servers.
Dom0 - 75.126.2.202 (RHEL4)
domU (CentOS) - 75.126.3.248 -> 75.126.3.251

Dom0, .248, & .249 can all talk to each other okay (& the outside world)

However, for some inexplicable reason, .250 cannot talk  to .249, or  
vice versa, yet .250 can ping the other VMs & Dom0 without any issue.
---
# ping 75.126.3.249
PING 75.126.3.249 (75.126.3.249) 56(84) bytes of data.
From 75.126.3.250 icmp_seq=0 Destination Host Unreachable
From 75.126.3.250 icmp_seq=1 Destination Host Unreachable
From 75.126.3.250 icmp_seq=2 Destination Host Unreachable
---

I can ping .250 from .248, but not from Dom0, or any other VMs.

/etc/sysconfig/network-scripts/ifcfg-eth0
----
TYPE=Ethernet
DEVICE=eth0

IPADDR=75.126.3.250
NETMASK=255.255.255.240
NETWORK=75.126.3.240
BROADCAST=75.126.3.255

BOOTPROTO=none
ONBOOT=yes
USERCTL=no
ip route add default dev eth0
---
All the other VMs have similar settings to the above, with the only  
difference being IPADDR.
Dom0
---
DEVICE=eth1
BOOTPROTO=static
IPADDR=75.126.2.202
GATEWAY=75.126.2.201
NETMASK=255.255.255.248
ETHTOOL_OPTS="autoneg off speed 100 duplex full"
---

Thoughts? As I remarked at the start, this SEEMS to be a routing  
issue, but the IP configuration seems to check out okay.
Y.

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