Iptables Command Example Linux
Show ip tables with line number
myuser@myvpn ~$ sudo iptables -L -n --line-numbers
[sudo] password for myuser:
Chain INPUT (policy DROP)
num target prot opt source destination
1 ACCEPT all -- 172.16.222.125 192.168.74.10 /* pritunl_dev */
2 DROP all -- 172.16.222.125 0.0.0.0/0 /* pritunl_dev */
3 ACCEPT all -- 0.0.0.0/0 192.168.75.10 /* pritunl_5d91e9754556d1020e10fd0e */
4 ACCEPT all -- 0.0.0.0/0 192.168.220.0/24 /* pritunl_5d91e9754556d1020e10fd0e */
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Ip Tables insert firewall rule on specific line, this command with insert rule on forward segment line 3
myuser@myvpn ~$ sudo iptables -I FORWARD 3 -s 172.16.212.124 -m comment --comment pritunl_dev -j DROP
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