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I have a script that runs at startup loading all our firewall rules as we use this on multiple servers.
We have 1 users that have a dynamic ip rather than fixed and is using the no-ip service so we can add to the firewall. Rather than have a cron to keep reloading the whole firewall, is there a way to just reload 1 rule line so we can keep reloading regular incase the ip changes.
Have a startup script that checks your ip address, use sed or perl to edit your iptables save file accordingly, then load it. I would think that should be fairly simple?
On the lowest level the first thing would be to get rid of per-user iptables rules and dump all of those in an ipset bucket instead: this requires only one iptables rule plus the buckets contents can be modified on the fly without having to reload any iptables rule. On a higher level I'm sensing this won't synchronize, audit and scale well so maybe instead use a single bastion host which users can SSH (pubkey only of course) or VPN into?
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