Bigger bug than expected?

[Justin Piszcz <war () starband net>]

Further NMAP testing shows the following: (IPTables 1.2.4/Kernel 2.4.18)

nmap -P0 -sT -p 21,80 IP
21/tcp     filtered    ftp
80/tcp     filtered    http

nmap -P0 -sF -p 21,80 IP
21/tcp     open        ftp
80/tcp     open        http

nmap -P0 -sX -p 21,80 IP
21/tcp     open        ftp
80/tcp     open        http

nmap -P0 -sN -p 21,80 IP
21/tcp     open        ftp
80/tcp     open        http