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Quickly Allowing/Denying IP’s Using Iptables

JustinJustin Member
edited February 20 in Performance and Security
How do you block an IP using iptables?
iptables -A INPUT -s xx.xx.xx.xx -j DROP
How do you block an IP from a specific port?
iptables -A INPUT -p tcp -s xx.xx.xx.xx --dport PORT -j DROP
(xx.xx.xx.xx is the remote IP address and PORT is the port number you wish to allow/deny access to.)
How do you allow access to an IP?
iptables -A INPUT -s xx.xx.xx.xx -j ACCEPT
How do you allow access to an IP to a specific port using iptables?
iptables -A INPUT -p tcp -s xx.xx.xx.xx --dport PORT -j ACCEPT
(Again, xx.xx.xx.xx is the remote IP address and PORT is the port number you wish to allow/deny access to.)

How do you block a scanner on a server for example "blablabla.at.ISC.SANS" using iptables?
iptables -I INPUT -p tcp --dport 80 -m string --algo bm \
--string 'GET /blablabla.at.ISC.SANS.' -j DROP
More information can be found in our article about the most common iptables rules:
https://community.time4vps.com/discussion/271/basic-and-most-common-iptables-rules
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