Q:

Options missing from iptable man page

I was looking at iptables man pages. But I did not find anything about  --sport and --dport. 

--sport is short for --source-port
--dport is short for --destination-port

Why are those options missing from Ubuntu manpages? I also looked at
iptables --help
info iptables

A:

--source-port and -destination-port (and their short forms) are provided by the tcp extension (and some other extensions). Extensions are documented in the iptables-extensions man page.

