Home / server / Questions / 659133
Accepted
Milos Cuculovic
Asked: 2015-01-14 05:52:08 +0800 CST

How to remove this iptables rule?

  • 772

I have an iptables rule. When searching for it with

sudo /sbin/iptables -L -n --line-numbers

I am getting it

Chain tcp_inbound (1 references)
num  target     prot opt source               destination
xxxx
2    ACCEPT     tcp  --  10.10.0.20           0.0.0.0/0           tcp dpt:25
xxxx
...

My goal is to delete this rule.

I tried with 

sudo iptables -D INPUT 2

But the rule is still there. I am on debian. Any idea?

linux

2 Answers

  1. You're trying to delete rule 2 of chain INPUT, where your rule is stored in chain tcp_inbound.

    • 10
  2. Best Answer

    The easiest way to find which rule to delete is to check the output of iptables-save, and change -A to -D is the rule you want to remove.

    In your case :

    $ iptables-save | grep 10.10.0.20
....
-A tcp_inbound -s 10.10.0.20/32 -p tcp -m tcp --dport 25 -j ACCEPT
....

    So you just need to issue :

    iptables -D tcp_inbound -s 10.10.0.20/32 -p tcp -m tcp --dport 25 -j ACCEPT
    • 5