Tag: -L

iptables: delete specific rule

You can list the existing iptables rule along with their line number with:

iptables -L –line-numbers

The output will be as follows:

Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 KUBE-SERVICES all -- anywhere anywhere /* kubernetes service portals */
2 KUBE-FIREWALL all -- anywhere anywhere
3 ACCEPT udp -- anywhere anywhere udp dpt:domain
4 ACCEPT tcp -- anywhere anywhere tcp dpt:domain
5 ACCEPT udp -- anywhere anywhere udp dpt:bootps
6 ACCEPT tcp -- anywhere anywhere tcp dpt:bootps

Then you can delete the rule with the line-number  3 with:
iptables -D INPUT 3