Facing problem with ICMP (ping request)

[princeu28]

Facing problem with ICMP (ping request) , its only replying to one ping request failing on second onwards

I'm facing issue with ICMP , its a red hat linux 4.0 system. the first ping request works fine but when I try to start a second ping request it does not give any reply even if I'm trying from same machine . I have even checked from sending ping from different machines at same time & it only replies to one request at a time means sometime it replies to first request then move on to second one but only one is working at a time ..

Any one has suggestion what it could be ...

[edge]

Please do not double post.

Thank you