January 23rd, 2005, 15:54

I've ported OpenBSD's tcpdrop(8) and a relevant kernel part.
>From the man page,

The tcpdrop command drops the TCP connection specified by the local
address laddr, port lport and the foreign address faddr, port fport.

There are patches for HEAD and RELENG_4:

Two questions: do we want to have it in the base system? Does the
diff look OK (I didn't test IPv6 part)?"