Public bug reported:

Server side configuration:

server 10.25.8.0 255.255.255.0
server-ipv6 2001:db8:0:123:8000::/65

push redirect-gateway
push "dhcp-option DNS 10.25.8.1"
push "route-ipv6 2000::/3"
push redirect-gateway ipv6

NetworkManager creates this entry for dnsmasq:

dnsmasq[5628]: setting upstream servers from DBus
dnsmasq[5628]: using nameserver 10.25.8.1#53 for domain 10.in-addr.arpa

But it should create this one:

dnsmasq[5628]: using nameserver 10.25.8.1#53

When you comment-out ipv6 related strings on server side, NetworkManager
works as expected.

NetworkManager version 0.9.8.8

Bug is somewhere there...
https://cgit.freedesktop.org/NetworkManager/NetworkManager/log/src/dns-
manager/nm-dns-dnsmasq.c

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: dns ipv6 networkmanager openvpn reverse-dns

** Description changed:

  Server side configuration:
  
  server 10.25.8.0 255.255.255.0
  server-ipv6 2001:db8:0:123:8000::/65
  
  push redirect-gateway
  push "dhcp-option DNS 10.25.8.1"
  push "route-ipv6 2000::/3"
  push redirect-gateway ipv6
  
  NetworkManager creates this entry for dnsmasq:
  
  dnsmasq[5628]: setting upstream servers from DBus
  dnsmasq[5628]: using nameserver 10.25.8.1#53 for domain 10.in-addr.arpa
  
- But it should create only one:
+ But it should create this one:
  
  dnsmasq[5628]: using nameserver 10.25.8.1#53
  
  When you comment-out ipv6 related strings on server side, NetworkManager
  works as expected.
  
  NetworkManager version 0.9.8.8
  
  Bug is somewhere there...
  https://cgit.freedesktop.org/NetworkManager/NetworkManager/log/src/dns-
  manager/nm-dns-dnsmasq.c

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https://bugs.launchpad.net/bugs/1547999

Title:
  Network manager adds "reverse-DNS" for DNS IP when there are more than
  one IP address provided by openvpn

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