How to start / stop iptables?

BillEssley · Nov 15, 2016

How can I start and stop iptables on Linux server? Also I want to auto start it on every reboot as well. Can any one guide me?

LJSHost · Nov 15, 2016

How this is done is slightly different across Linux distributions.
What distribution are you using ?

24x7CSM · Nov 15, 2016

For linux or CentOs 6.x use the command

service iptables restart

For CentOS 7.x

systemctl restart iptables

stackstar · Nov 22, 2016

You can also clear all the iptables rules with iptables -F and iptables -X , but make sure you script that as you can lock yourself out if you dont allow the SSH port your are actually connected on

mondoserv · Nov 24, 2016

In order to make sure you don't get locked outside, verify that the iptables policy on these chains is set to ACCEPT. If not, set it:
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

mondoserv · Nov 24, 2016

to check if an IP address is listed or not, use 'iptables -L -n -v |grep IP'

BillEssley · Nov 24, 2016

mondoserv said:
to check if an IP address is listed or not, use 'iptables -L -n -v |grep IP'

I don't understand this. I think it needs to check with tools out there, not on my VPS.

mondoserv said:
In order to make sure you don't get locked outside, verify that the iptables policy on these chains is set to ACCEPT. If not, set it:
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

Can you elaborate in details?

mondoserv · Nov 24, 2016

The policy is a default rule for each chain. If it is set to DROP, you need to create a specific rule to ACCEPT traffic from a certain IP address or to a certain port. If it is set to ACCEPT, it will accept all traffic, unless there is a rule to DROP traffic from a certain IP address or to a certain port.
The iptables rules present on your server cannot be checked from outside the server.

jwn · Dec 17, 2016

Find status of firewall

Login as root user either by opening the Terminal or login over the ssh based session. Type the following command:

sudo ufw status

Sample outputs:

Status: inactive

Ubuntu stop iptables service command

Type the following command to unloads firewall and disables firewall on boot:

sudo ufw disable

Ubuntu start iptables service command

Type the following command to reloads firewall and enables firewall on boot:

sudo ufw enable

Ubuntu reload / restart iptables service command

Type the following command to reloads firewall:

sudo ufw reload

StartVM · Dec 17, 2016

BillEssley said:
How can I start and stop iptables on Linux server? Also I want to auto start it on every reboot as well. Can any one guide me?

For autostart, I think most linux distros do this automatically for iptables but in CentOS 7 I know its sudo systemctl enable iptables

How to start / stop iptables?

BillEssley

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