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Today we had the question Should IPv4 ICMP from untrusted interfaces be blocked?

While looking for references to provide a good answer I found a very similar question already asked and answered in the IT Security Stack Exchange: Is it a bad idea for a firewall to block ICMP?

What is the right way to proceed in this case? Shall we mark the new question as a duplicate? Is it even possible to do so when the new and the old question are in two different StackExchange sites? Maybe migrate the question? Or provide an answer with a reference to the old question?

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  • The problem is the blurry line between where a question belongs - some questions could belong on either SF or NE - some questions could belong on either SO, SF, or NE.
    – Libbux
    Jul 9 '13 at 5:21
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What is the right way to proceed in this case?

Answer the question on NE

Shall we mark the new question as a duplicate?

Duplicates only matter within a specific site on SE. If the question already exists on serverfault, it still is not a duplicate if we get a very similar question on NE from a different person. It's worth mentioning that SE discourages cross-posting the same question between sites.

Maybe migrate the question?

If it clearly is not a fit for our site, then flag for migration... I see migrations quite often on Stack Overflow. However, I haven't seen the mods very active about question migration here, even when the questions clearly should have been posted to Super User... this will probably change if we exit beta.

Or provide an answer with a reference to the old question?

That's up to the people who post answers... normally I just provide a hyperlink to another site as a comment, unless I have something more to add to the other answer.

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If the question is 'on topic' here on NE, then we should answer it here. If the answer's author uses that other stack's answer as their source of knowledge, then I think a footnote link over would be warranted.

In the specific case you've mentioned, the author of the answer probably wrote from their own knowledge, so I wouldn't expect them to mention the other stack's Q/A.

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