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I suspect we are going to see a lot of questions about iptables, (and other flavors of on-host firewall/packet filtering.)
I can see how that might depend on the question, but in general I think that is going to be more of a serverfault or possibly security question.
In my mind, that would depend on the context.
If it is iptables running on a Linux box being used as a router or firewall on the network? Yes, it is on topic.
If it is iptables running on a Linux box and users can't access my website? No, it is better servered at SF or Unix & Linux.
I.e. if someone would ask about VRFs on Linux or network namespaces that would be most on-topic i think.
Traffic shaping could be a good gray area to think about.
Plain iptables firewalling probably doesn't really ring "network engineering" and would not really contribute anything.
At the concept level, yes. But in the specifics, not so much as it's an OS level question at that point -- and depends on a number of OS-side specifics.