Iptables and iptables configuration

Iptables and iptables configuration

1. open ports 22, 80, and 9011 on the server:

Iptables-a input-p tcp -- dport 9011-j ACCEPT
Iptables-a output-p tcp -- sport 9011-j ACCEPT

Iptables-a input-p tcp -- dport 22-j ACCEPT
Iptables-a output-p tcp -- sport 22-j ACCEPT

Iptables-a input-p tcp -- dport 80-j ACCEPT
Iptables-a output-p tcp -- sport 80-j ACCEPT

 

2. Close all other ports:

Iptables-P INPUT DROP
Iptables-P FORWARD DROP
Iptables-P OUTPUT DROP

 

3. View iptables:

Iptables-L-n -- line-number

---------------------------------

Num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0/0 tcp spt: 9011
2 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt: 22
3 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt: 80

 

4. Delete the third rule:

Iptables-d input 3

Iptables-d output 3