리눅스 방화벽 iptables

1. 본인 IP 확인

   $ ifconfig

2. target ip 방화벽 확인

   $ telnet ip port

3. 방화벽 등록
   • 확인 : iptables -nL {-line-numbers}
   • 삽입 : iptables -I INPUT 1 -s 111.111.111.111 -p tcp –dport 2000 -j ACCEPT
   • 삽입 : iptables -I chain-incoming-ssh 1 -s 192.168.1.140 -j ACCEPT
   • 삽입 : iptables -I IN_public_allow 1 -s 0.0.0.0/0 -p tcp --dport 8888 -m conntrack --ctstate NEW,UNTRACKED -j ACCEPT
   • 초기화(?) :firewall-cmd --reload
4. [centOS8 ↑] firewall

 

참고:
1. https://webdir.tistory.com/170
2. https://seulcode.tistory.com/276
3. https://itzone.tistory.com/609
4. https://www.lesstif.com/system-admin/rhel-centos-firewall-22053128.html