iptables/connlimit and patch-o-matic-ng

This is an older production server running RedHat8, 2.4.20, and iptables v1.2.8

I'm trying to setup a per IP connlimit and

"iptables -A INPUT -p tcp --dport 80 -m connlimit --connlimit-above 8 -j REJECT --reject-with tcp-reset"

fails with this error

"Couldn't load match `connlimit':/lib/iptables/libipt_connlimit.so: cannot open shared object file: No such file or directory"

Searching around I found references to patch-o-matic-ng but I have no clue what it is or how to use it. Can somone explain this for me?

Is there any relatively safe way to get connlimit to work?

Thanks in advance!

 

 

 

 

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