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A switch is something which forwards packets unmodified between devices inside the same network. A router is something which forwards packets between networks based on routing rules and will also modify packets, i.e. decrease TTL inside IP packets. For a more detailed comparison see Cisco: What is a Network Switch vs. a Router? which also has a nice compact ...


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You can disable the module. modprobe nf_conntrack nf_conntrack_helper=0 More info about securing helpers without disabling the module entirely can be found here https://home.regit.org/netfilter-en/secure-use-of-helpers/


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I agree with billc that the intention is to improve availability, however when most systems start swapping, performance drops so dramatically that you are facilitating a DOS for your users. It is a good idea to be able to hibernate a system for fast recovery after a power outage (if you don't have enough UPS) which does require swap. I'm struggling to ...



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