Thanks Radar.
I wanted to get rid of that route but didint know how.

But as I guessed the problem pinging 10.18.110.1 persists.

The other two gateways responds fine to ping.

My current routes.
root]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
172.21.65.0 * 255.255.255.128 U 0 0 0 eth1
172.21.2.0 * 255.255.255.128 U 0 0 0 eth0
10.18.110.0 * 255.255.255.0 U 0 0 0 eth2
default 10.18.110.1 0.0.0.0 UG 0 0 0 eth2