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HOW TO: Check if IP is blocked from IPtables
Posted by Sugen S. on 12 February 2019 11:12 AM

Checking if an IP is blocked in IPTABLES

Check if IP is blocked:

 

 iptables -L -n --line | grep [IP Address]

 

If IP appear as DROP or REJECT, the IP has been blocked 

 

Unblock the IP Address:

 

iptables -I INPUT -s [IP Address] -j ACCEPT

 

Blocking back an IP Address:

 

 iptables -A INPUT -d [IP Address] -j DROP

 

 service iptables save

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To unblock an IP from the CSF from SSH, please follow the steps below:

 

2. To check if the IP is blocked by CSF, please execute the following command:

 

csf -g IP_address

 

Note: IP_address being the specific IP you wish to check.

 

3. If the IP is denied and you wish to remove it, please execute the following command:

 

csf -dr IP_address

 

4. To complete the process, you will need to restart CSF for the changes to take effect:

 

csf -r

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Note: Full path to IPTABLES is /sbin/iptables, you can replace command # iptables with /sbin/iptables

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