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I'm following some instructions for Installing Tomcat. They require me to add the following line to my iptables file:

-A RH-Lokkit-0-50-INPUT -p tcp -m tcp --dport 8080 --syn -j ACCEPT

Having carefully read the man page for iptables, I have learned what the parameters do, except for the first one.

What does -A RH-Lokkit-0-50-INPUT do, and can you confirm that it is sensible in this case?

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The -A RH-Lokkit-0-50-INPUT is adding it to the chain named RH-Lokkit-0-50-INPUT. Unless that chain exists, I would not use it.

You can see your existing rules with:

iptables -L -n

If you do not have the chain, you can simply use the following in its place:

iptables -A INPUT -p tcp -m tcp --dport 8080 --syn -j ACCEPT

If you do not have firewall rules setup in the first place, this rule is superfluous.

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  • Many thanks, Warner. Doing what you suggested has worked.
    – David Pinn
    Mar 5, 2010 at 5:00

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