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Re: Persistent failure to lookup hostname

From: Robert Pluim
Subject: Re: Persistent failure to lookup hostname
Date: Tue, 04 Oct 2022 11:30:08 +0200

>>>>> On Tue, 4 Oct 2022 10:05:29 +0200, <tomas@tuxteam.de> said:

    tomas> On Tue, Oct 04, 2022 at 09:37:53AM +0200, Robert Pluim wrote:
    >> sudo tcpdump -i any -n udp and port 53

    tomas> "Out of Emacs" can mean different things :)

    tomas> E.g. if nscd is active, that's a caching layer somewhere at libc 
level (so
    tomas> Emacs won't be aware of it, but the request won't hit the net, so 
    tomas> won't see it). Also, for the young-uns, systemd is said to do DNS 
    tomas> itself too (what doesn't it do?), but I can't test that due to lack 
    tomas> systemd ;-) That one, possibly, is also in limbo between Emacs and 
    tomas> tcpdump can see (but also possibly, not).

Yes, and then there is dnsmasq, and the upstream DSL 'routerʼ might be
caching DNS, etc etc. Checking the network traffix just helps in
finding out who to blame :-)


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