i am using base Linux(Debian flavor) of 2.6.12. on top of that i have our proprietary changes,which will hardly touches kernel.
the issue is, ping command for packet size of 1472 to 1476 fails.and for other packet sizes it is successful

ping -s 1474 "ipAddr"
and it says->ping: sendmsg: Operation not permitted

any clue on how to debug this.