Iptables using multiport to add multiple discontinuous ports does not specify

Iptables using multiport to add multiple discontinuous ports for disc dancing, 01:26, Linux technology, reviews (0), references (0), reading (12214), Via site original Big | c3> Use multiport to add multiple ports that are not connected and can add up to 15 groups. As follows

-A input-p tcp-m multiport–dport 21:25,135:139-j DROP

If you do not use the multiport parameter, you can only add contiguous ports.

such as-a input-p tcp–dport 21:25-j DROP

And not written 21:25,135:139.

Iptables using multiport to add multiple discontinuous ports does not specify