Blocking FTP with iptables

Question

Hi all into my ubuntu server I want to block the ftp port for all except my ip: 123.123.123.123

How is possible this?

Yes but I wanna be sure what I set into iptables because I have a lot of site into this server — Alessandro Minoccheri, Jun 06 '13 at 12:19

Stef Heylen · Answer 1 · 2013-06-06T12:38:12.667

4

Write a rule which blocks all the incoming traffic for FTP, assuming the FTP port is 21:

iptables -A INPUT -p tcp --destination-port 21 -j DROP

Then write the following rule to exclude your IP from being blocked:

iptables -I INPUT -s 123.123.123.123 -p tcp --destination-port 21 -j ACCEPT

The -I parameter will insert the rule at the top of the stack. Since we didn't provide any rule number, it will be inserted at the top by default.

edited Jun 06 '13 at 12:38

answered Jun 06 '13 at 12:20

Stef Heylen

If I write the first iptables return me No chain/target/match by that name why? what is wrong? – Alessandro Minoccheri Jun 06 '13 at 13:09

1 Answers1