Is there a way in iptables to shortcut to the localhost instead of using an ip address?

Rusty Weber

3/9/24, 9:34 AM

I have the following fules that I would like enforced.. However, if the ip address of my machine changes, I would like to keep the rules enforced. These current rules will get out dated in the event that my ip address changes.

-A OUTPUT -j CONNMARK --restore-mark --nfmask 0xffffffff --ctmask 0xffffffff
-A OUTPUT ! -d 192.168.50.13/32 -m owner --uid-owner 130 -j MARK --set-xmark 0x1/0xffffffff
-A OUTPUT -d 192.168.50.13/32 -p udp -m udp --dport 53 -m owner --uid-owner 130 -j MARK --set-xmark 0x1/0xffffffff
-A OUTPUT -d 192.168.50.13/32 -p tcp -m tcp --dport 53 -m owner --uid-owner 130 -j MARK --set-xmark 0x1/0xffffffff
-A OUTPUT -s 192.168.50.13/32 -p tcp -m tcp -m multiport --sports 6800,7777,58846 -m owner --uid-owner 130 -j MARK --set-xmark 0x0/0xffffffff
-A OUTPUT ! -s 192.168.50.13/32 -j MARK --set-xmark 0x1/0xffffffff

In stead of using the actual IP address of the local system, I would much rather use something that changes with the ip address of the system. It's kind of silly, my ip address changes and now my firewall doesn't behave as expected.

1 + 0

iptables

Score:2

Server

hardillb

3/9/24, 9:39 AM

Use something like -i eth0 to filter on the network interface rather than the IP address bound to the interface.

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