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Re: getaddrinfo(3) on numerical addresses

> I suspect there's some misunderstanding.
Yes. It's about numerical IPv4 addresses being looked up with an AF_INET6 hint.

check_ping tries to figure out whether it needs to call ping6 (suppose 
wer'e on a system where ping6 is different from ping).
Suppose that check_ping is invoked without -4/-6 and with -H
Now check_ping tries to figure out whether the -H argument is a/resolves to 
a IPv6 address. To do so, it checks whether getaddrinfo() on the -H argument 
(which is with an AF_INET6 hint succeeds. But this triggers a DNS 
Given this is a monitoring system, who's job it is to detect server failures, 
marking random servers/switches as dead while the resolver is going mad and
so check_ping on their numerical IPv4 times out is not particularily useful.

I guess the point is what you expect getaddrinfo on with a AF_INET6 
hint to do. Well, you could have a search domain of and have an AAAA record. How likely is that? 

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