unfamiliar alternative --dport. It worked with -p tcp but which is not likely intending to assistance me In such cases because it just leads to exactly the same issue: defining individual tcp/udp regulations for everything.

My Google-fu is horrible, so I have nonetheless to find a Functioning Option for almost any of this. I'm functioning CentOS 6.5 within the router. Any enable and ideas that you simply men can present could be awesome.

Then aim only on what you would like and do not copy/paste instructions from google without having being aware of what they do:

The command iptables now not recognizes one of the most normally made use of choices when defining principles: --dport.

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Bonus issue: I'm also planning to configure port forwarding at the same time. Is it still necessary to established rules to simply accept incoming connections around precise ports?

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As an example if port numbers are modified by NAT on possibly host, there isn't any method to reconstruct These. It is also not a specified, that link tracking will get the job done appropriately, if the very first packet it sees is usually a SYN-ACK in lieu of an ACK.

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Every of those 3 answers have disadvantages, so you have to carefully look at, if you actually need To accomplish this particular forwarding.

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Port forwarding isn't going to get managed via the INPUT chain, so you don't need to open the port inside the INPUT chain. It does get handled through the FORWARD chain, nevertheless. Be cautious on that.