[Bug 1888047] Re: libnss-mdns slow response

[Trent Lloyd]

Can you please confirm
(1) The timing of "getent hosts indigosky.local", "host indigosky.local", "nslookup indigosky.local" and "nslookup indigosky.local 192.168.235.1" all done at the same time (mainly adding the direct lookup through the server, wondering if nslookup is doing something weird in focal).
(2) The timings for the same if you switch mdns4 back to mdns4_minimal (but remove everything else)

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https://bugs.launchpad.net/bugs/1888047

Title:
  libnss-mdns slow response

Status in nss-mdns package in Ubuntu:
  New

Bug description:
  mdns responses are very slow which degrades the preformance of some
  services in my lan due to this long delay. Please see the log below:

  rumen at sirius:~/indigo.git$ time nslookup sirius.local
  Server:		127.0.0.53
  Address:	127.0.0.53#53

  Non-authoritative answer:
  Name:	sirius.local
  Address: 192.168.11.109
  Name:	sirius.local
  Address: 172.17.0.1
  Name:	sirius.local
  Address: fe80::7afb:484a:7307:cf6

  
  real	0m5,224s
  user	0m0,008s
  sys	0m0,008s
  rumen at sirius:~/indigo.git$ time nslookup dir.bg
  Server:		127.0.0.53
  Address:	127.0.0.53#53

  Non-authoritative answer:
  Name:	dir.bg
  Address: 194.145.63.12

  
  real	0m0,035s
  user	0m0,012s
  sys	0m0,006s
  rumen at sirius:~/indigo.git$ cat /etc/resolv.conf 
  # This file is managed by man:systemd-resolved(8). Do not edit.
  #
  # This is a dynamic resolv.conf file for connecting local clients to the
  # internal DNS stub resolver of systemd-resolved. This file lists all
  # configured search domains.
  #
  # Run "resolvectl status" to see details about the uplink DNS servers
  # currently in use.
  #
  # Third party programs must not access this file directly, but only through the
  # symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,
  # replace this symlink by a static file or a different symlink.
  #
  # See man:systemd-resolved.service(8) for details about the supported modes of
  # operation for /etc/resolv.conf.

  nameserver 127.0.0.53
  options edns0
  search www.tendawifi.com
  rumen at sirius:~/indigo.git$ cat /etc/nsswitch.conf 
  # /etc/nsswitch.conf
  #
  # Example configuration of GNU Name Service Switch functionality.
  # If you have the `glibc-doc-reference' and `info' packages installed, try:
  # `info libc "Name Service Switch"' for information about this file.

  passwd:         files systemd
  group:          files systemd
  shadow:         files
  gshadow:        files

  hosts:          files mdns4_minimal [NOTFOUND=return] dns
  networks:       files

  protocols:      db files
  services:       db files
  ethers:         db files
  rpc:            db files

  netgroup:       nis
  rumen at sirius:~/indigo.git$

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