how block port 140 udp on eth1

[ahmedlinux]

If you had to block port 140 for udp on eth1 in an active way, for packets with source port 8989, but block it actively so not silently ignore, but to send active signal to the sender of this packet that this port is blocked ?

Write exact /commands

 

[cPanelLauren]

Hello @ahmedlinux

I'd suggest you check the man page for iptables as well as some of the following:

iptables(8) - Linux man page

An In-Depth Guide to iptables, the Linux Firewall - Boolean World

Control Network Traffic with iptables

Thanks!