https://www.kokaruk.com/macos-pf-firewall/ https://blog.csdn.net/yjy1304/article/details/90762170 https://blog.csdn.net/shuishen49/article/details/77587527
macos的iptables功能是pfctl
原文：https://www.cnblogs.com/shengulong/p/11575690.html
