Re:1.1.1.1: Fast, privacy-first consumer DNS service
by rootusrootus on Sunday April 01, 2018 @10:34PM
(#16731876)
Unless you tell it not to, ping will try a reverse lookup on the IP you are pinging in order to display that to you in the output. It's a good idea to keep that in mind when you ping something, especially if you notice the first ping is abnormally slow.
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Re:1.1.1.1: Fast, privacy-first consumer DNS service
by dingo_bat on Sunday April 01, 2018 @10:52PM
(#16731945)
That reverse lookup time is not counted in the first ping.
Re:1.1.1.1: Fast, privacy-first consumer DNS service
by rootusrootus on Monday April 02, 2018 @09:41AM
(#16734357)
Perhaps that depends on operating system. In the 30 years I have been using ping on Linux, the reverse lookup time is absolutely included in the first ping time.
Re:1.1.1.1: Fast, privacy-first consumer DNS service
by dingo_bat on Monday April 02, 2018 @12:40PM
(#16736195)
If true, that's a bug.
Edit: Assuming this is the right file: https://github.com/iputils/iputils/blob/master/ping.c, I don't see the reverse lookup code anywhere. But then I'm not the most proficient in reading linux code.