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Would the following iptables command on an OpenWRT router assure that no one client has more than 50 active connections?

$ iptables -I FORWARD -m connlimit --connlimit-above 50 -j REJECT --reject-with tcp-reset
iptables v1.4.6: Couldn't load match `connlimit':File not found

If so, what package do I need to install to be able to use --connlimit?

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I don't believe it is in the standard distribution. You will need to compile your own kernel. There is ticket with a patch already submitted.

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