Posted February 4, 20232 yr 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://www.lcwhost.org/topic/21-basic-and-most-common-iptables-rules/
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