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One of my computers won't resolve a domain that the local gateway resolves with a CNAME. The nsswitch config is identical on both machines. I just can't work out what the cause is.

computer A (works):

$ getent ahosts cloud.$domain 10.12.0.2 STREAM rockpro64 10.12.0.2 DGRAM 10.12.0.2 RAW

computer B (doesn't):

$ getent ahosts cloud.$domain $ # exit code 2

corresponding dns requests are issued and answered (during the call to getent): wireshark screenshot (OPT disables dnsseq-rr)

interestingly (computer B):

getent ahostsv4 cloud.$domain 10.12.0.2 STREAM rockpro64 10.12.0.2 DGRAM 10.12.0.2 RAW

nsswitch.conf on both machines:

.. hosts: mymachines mdns_minimal [NOTFOUND=return] resolve [!UNAVAIL=return] files myhostname dns ..

from dnsmasq's config (on the gateway):

cname=cloud.$domain,rockpro64

EDIT:

/etc/gai.conf is identical on both machines and consists only of comments.

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  • Are these dual-stack IPv4+IPv6 machines? Do you have an /etc/gai.conf file? On dual stack machines this can change what getaddrinfo(3) returns, which is what ahosts uses. Commented Oct 16 at 20:49
  • 2
    Please don't post images of text. Copy and paste the text itself into your question and format it as code by selecting it and pressing Ctrl-K or by using the editor's {} icon, or by adding a line containing three backticks before AND after the text. Commented Oct 17 at 0:11
  • @StephenHarris thank you for the info! i didn't know about that file. the files are identical on both machines, consisting only of comments. Commented Oct 17 at 16:32
  • @cas I tried the text export of wireshark but it's very verbose. Do you know of a way to get the synopsis like shown in the screenshot? Commented Oct 17 at 16:40

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