[gentoo-user] iptables: how can I include multiple hosts/IPs in "-s" and "-d"?

[Jarry]

Hi

I'd like to ask if there is some way to include multiple discrete
hosts/IP's in --source and --destination options of iptables.

I'm trying to write firewall rules for my server, but it has
12 IP's from different segments (and maybe it gets a few more
later), and the script grows up as I have to write nearly
identical rules with difference only in -s/-d IP's.

What I'm looking for is a way to define some variable at the
beginning of my script, like MY_IP="IP1 IP2 IP3 IP4..." and
later to use is in rules (iptables -A INPUT -s $MY_IP...).
But I do not know how to use it. As far as I understand it,
--source/--destination accepts only single IP's or continuous
IP-segments...

Jarry

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