Re: Persistent failure to lookup hostname

[Robert Pluim <rpluim@gmail.com>]

>>>>> 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 tcpdump
    tomas> won't see it). Also, for the young-uns, systemd is said to do DNS caching
    tomas> itself too (what doesn't it do?), but I can't test that due to lack of
    tomas> systemd ;-) That one, possibly, is also in limbo between Emacs and what
    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 :-)

Robert
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