Linux: Iptables # 17 Allow secure POP3S incoming request?

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Secure POP3S uses the tcp port 995 by default. Following iptable rules will allow server POP3S incoming client request (open port 995) for server ip address 202.54.1.20:
iptables -A INPUT -p tcp -s 0/0 –sport 1024:65535 -d 202.54.1.20 –dport 995 -m state –state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -p tcp -s 202.54.1.20 –sport 995 -d 0/0 –dport 1024:65535 -m state –state ESTABLISHED -j ACCEPT

Following rules allows POP3S outgoing client request from firewall host 202.54.1.21 (open port 995):
iptables -A OUTPUT -p tcp -s 202.54.1.21 –sport 1024:65535 -d 0/0 –dport 995 -m state –state NEW,ESTABLISHED -j ACCEPT

iptables -A INPUT -p tcp -s 0/0 –sport 995 -d 202.54.1.21 –dport 1024:65535 -m state –state ESTABLISHED -j ACCEPT

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.