I'm having a strange problem with an RHEL 5 server. I changed its IP address, we are migrating to a new address pool, and something is blocking all outgoing traffic, but I can SSH in on that interface (eth0). All traffic works properly on our private net (eth1). I flushed iptables so it should not be in the way. My routing table looks just like another RHEL 5 server that made the switch without problem. I have rebooted and no-joy there either. Where else might a latent old IP address be lurking that is causing this problem, because when I switch it back to the old address it works just fine.
EDIT: As requested here is the routing table and output of 'arp -n'
# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface *****.56.0 * 255.255.255.0 U 0 0 0 eth0 10.0.0.0 * 255.255.255.0 U 0 0 0 eth1 default gateway.***** 0.0.0.0 UG 0 0 0 eth0 # arp -n Address HWtype HWaddress Flags Mask Iface ******.56.254 ether 00:A0:D1:E4:58:0D C eth0 10.0.0.203 ether 00:40:05:A0:21:93 C eth1 10.0.0.128 ether 00:21:5A:4C:1C:40 C eth1 10.0.0.129 ether 00:21:5A:47:36:80 C eth1 10.0.0.1 ether 00:0A:CD:20:64:28 C eth1 10.0.0.130 ether 00:22:64:0D:A5:46 C eth1 10.0.0.125 ether 00:22:64:0D:B5:A0 C eth1 10.0.0.127 ether 00:22:64:0B:D1:B0 C eth1 10.0.0.126 ether 00:21:5A:4C:4B:14 C eth1 10.0.0.124 ether 00:22:64:06:F8:AE C eth1
As I mentioned, the private network works fine and these machines can be seen in the arp table.