iptables/ipset syntax

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Hello

I'm having some trouble understanding the correct syntax for an iptables rule involving ipset.

I need to forward between IPs within the same ipset. So I've tried using something like this:

iptables -A FORWARD -i eth0 -o eth0 -m set --match-set testset src,dst -p tcp --dport 9000:9020 -j ACCEPT

However this allows forwarding to all the eth0 network for the 'testset' IPs.

Instead
iptables -A FORWARD -i eth0 -o eth0 -m set --match-set testset src -m set --match-set testset dst -p tcp --dport 9000:9020 -j ACCEPT
seems to do what I need but I'm not 100% certain.

Anyone with a better understanding?

iptables v1.4.10
ipset v5.3.

Thank you.

--
Arthur Titeica

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