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[Bug 1802628] [NEW] winbind name resolution fails when remote host has multiple IPs

 

Public bug reported:

Description:    Ubuntu 18.04.1 LTS
Release:        18.04

winbind:
  Installed: 2:4.7.6+dfsg~ubuntu-0ubuntu2.2
  Candidate: 2:4.7.6+dfsg~ubuntu-0ubuntu2.2
  Version table:
 *** 2:4.7.6+dfsg~ubuntu-0ubuntu2.2 500
        500 http://gb.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
        100 /var/lib/dpkg/status
     2:4.7.6+dfsg~ubuntu-0ubuntu2 500
        500 http://gb.archive.ubuntu.com/ubuntu bionic/main amd64 Packages


This is essentially a confirmation of https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=825380

I had the combination of smb and autofs working in Ubuntu 16.04 and then
recently upgraded to 18.04.  I hadn't checked my back-up logs that used
autofs+smb for a while but today noticed that autofs claimed that it
could not resolve my Win10 hostname (the remote backup endpoint).  I
found the above Debian bug report and can confirm that the issue is
present in 18.04.

Steps to reproduce:
# ping abcomputer
ping: abcomputer : System error

# nmblookup abcomputer
192.168.1.8 abcomputer<00>
192.168.5.1 abcomputer<00>

Note the 192.168.5.1 IP is a Virtualbox host-only interface on the Win10
machine.  I then remove the host-only interface from the Win10 computer

# nmblookup abcomputer
192.168.1.8 abcomputer<00>

# ping hyperion
PING abcomputer (192.168.1.8) 56(84) bytes of data.
64 bytes from 192.168.1.8 (192.168.1.8): icmp_seq=1 ttl=128 time=0.533 ms

** Affects: samba (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1802628

Title:
  winbind name resolution fails when remote host has multiple IPs

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