firewall-cmd --list-all1 Linux firewall-cmd --list-all Version 확인 cat /etc/*release* lsof -p PID rpm -ql postfix |grep conf [root@ahn_test ~]# rpm -qa | grep tcpdump tcpdump-4.9.2-4.el7_7.1.x86_64 [root@ahn_test ~]# [root@ahn_test ~]# yum install tcpdump 방화벽 확인 https://www.lesstif.com/system-admin/rhel-centos-firewall-22053128.html centOS 6버전까지는 iptable를 사용하다가 7버전부터 firewalld를 사용 [root@localhost ~]# firewall-cmd --list-all public (active) target: de.. 2022. 9. 27. 이전 1 다음