Home.md
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- [tcpdump](technology/monitoring/tcpdump)
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### networking
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+- [firewalls](technology/networking/firewalls)
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- [subnet_cheatsheet](technology/networking/subnet_cheatsheet)
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- [wifi_connect](technology/networking/wifi_connect)
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technology/networking/firewall-cmd.md
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+# firewall-cmd
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+
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+## add / remove port
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+```
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+firewall-cmd --permanent --add-port=<port_num>/<protocol>
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+firewall-cmd --permanent --remove-port=<port_num>/<protocol>
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+
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+firewall-cmd --permanent --add-port=22/tcp
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+firewall-cmd --permanent --remove-port=22/tcp
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+```
technology/networking/firewalls.md
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+# firewalls
technology/networking/iptables.md
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+# iptables
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+
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+```
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+iptables -L
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+```
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+
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+```
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+iptables -S
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+```
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+
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+## import / export
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+see [guide][]
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+
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+```
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+iptables-save > filename
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+iptables-restore < filename
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+```
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+
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+[guide]: https://www.digitalocean.com/community/tutorials/how-to-migrate-iptables-firewall-rules-to-a-new-server