default route entry is missing.

Hi managers,

my default entry in the routing table is missing
automatically.  As soon as I boot the system and it
will clearly shows the default gateway entry in the
netstat -rn and I will be able to communicate with
different network. But after aproax 2mts default value
will be missing in the netstat -rn and i will not be
able to communicate with other network.  If I add
using route add default command it starts working fine
with out any problem.  the problem will repeat again
if I reboot the system.

I have added the default entry in the /etc/routes as
well as added route add default command in the
inet.local file also.

I realy not able to point what exactly happening after
two mts.  My other server with same config (Digital
4.0G) is working fine.

Please suggest

Regards
Riju

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