confusion with dport and sport

["J. Bakshi" <joydeep@infoservices.in>]

Hello,

I have found that TOS is helpful for traffic shaping. But some guide use
--sport where other use --dport the handle the same thing hence I am
very confusd !!
To get a good response from the ssh running on a remote server the rule
can be placed in the remote server can be

``````````````````
iptables -t mangle -A PREROUTING -p tcp --dport  $SSH_PORT -j TOS
--set-tos Minimize-Delay
`````````````````````

BUT some site do the same by replacing --dport to --sport

Which one should be the right value ? Please enlighten me.
Thanks