tcpdump (suid) not halted normally

[Indra Dermawan <indra@vlsi.itb.ac.id>]

Hi, I'm a newbie in Linux.
I've a problem with tcpdump.  I set it suid. When I run it as a user (not
root), it can't stop normally. When it stopped, it gave message like this:
linux socket : operation not permitted.
Help me please......

Thanks
--indra--