block all connections by default to 21 port

[bybrunos2]

Hello, how can i
block all connections by default to 21 port exept the IP list that i add manually?
thanks
Bruno

[evansa]

use the following:
csf -td 0.0.0.0/0  -p 21
You can then add manually the IPs you want to allow in /etc/csf/csf.allow

[bybrunos2]

thank you that help me