Iptables, more properly referred to as "iptables/netfilter" because of the two modules that are involved -- the userspace module "iptables" and the kernel module "netfilter" -- is the firewall
Commands guide for iptables firewall on linux os - XsoftHost Jan 10, 2017 Linux Iptables: HowTo Block or Open HTTP/Web Service Port Jul 11, 2005 A Guide to IPtables for your Cloud Server - IONOS iptables is a firewall utility which is built into the Linux kernel. This means that, unlike many other firewall programs, it is already installed on most contemporary Linux systems. iptables can be somewhat complicated to learn and configure, but it is a powerful and flexible tool which can be used to filter traffic to and from a Linux server. How to use IPTables on CentOS 7
iptables -A INPUT -m mac --mac-source 00:11:2f:8f:f8:f8 -j DROP Block a specific port. If all you want is to block a port, iptables can still do it. And you can block incoming or outgoing traffic. Block incoming traffic to a port. Suppose we need to block port 21 for incoming traffic: iptables -A INPUT -p tcp --destination-port 21 -j DROP
Search this site. GAA Techblog. Home iptables -A INPUT -m mac --mac-source 00:11:2f:8f:f8:f8 -j DROP Block a specific port. If all you want is to block a port, iptables can still do it. And you can block incoming or outgoing traffic. Block incoming traffic to a port. Suppose we need to block port 21 for incoming traffic: iptables -A INPUT -p tcp --destination-port 21 -j DROP
#!/bin/sh #iptable iptables -F iptables -P INPUT DROP iptables -P FORWARD DROP iptables -P OUTPUT DROP #Loopback iptables -A INPUT -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT iptables -A OUTPUT -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT #ping iptables -A OUTPUT -p icmp --icmp-type 0 -j ACCEPT iptables -A INPUT -p icmp --icmp-type 8 -j ACCEPT #snmp iptables -A OUTPUT -p udp --sport 161 -j ACCEPT iptables -A
A Guide to IPtables for your Cloud Server - IONOS