On Linux Debian 9 I am able to resolve a specific local domain e.g.
my.sample-domain.local using some commands like
host, but not with some other commands like
ping or the Postgres client
I think stuff like Network Manager has setup my DNS resolver correctly (the content of
/etc/resolv.conf), so I am not sure why is this happening?
I checked with a colleague using Windows 10 and they don't have any custom entry in their host file, although in their case the Windows version of
ping and their database UI for Postgres works as expected resolving the domain into an IP address.
Please see below:
$ ping my.sample-domain.local ping: my.sample-domain.local: Name or service not known $ host my.sample-domain.local my.sample-domain.local has address <THE_IP_REPRESENTING_THE_LOCAL_DOMAIN> $ ping -c 5 <THE_IP_REPRESENTING_THE_LOCAL_DOMAIN> PING <THE_IP_REPRESENTING_THE_LOCAL_DOMAIN> (<THE_IP_REPRESENTING_THE_LOCAL_DOMAIN>) 56(84) bytes of data. 64 bytes from <THE_IP_REPRESENTING_THE_LOCAL_DOMAIN>: icmp_seq=1 ttl=128 time=1.16 ms 64 bytes from <THE_IP_REPRESENTING_THE_LOCAL_DOMAIN>: icmp_seq=2 ttl=128 time=0.644 ms 64 bytes from <THE_IP_REPRESENTING_THE_LOCAL_DOMAIN>: icmp_seq=3 ttl=128 time=0.758 ms 64 bytes from <THE_IP_REPRESENTING_THE_LOCAL_DOMAIN>: icmp_seq=4 ttl=128 time=0.684 ms 64 bytes from <THE_IP_REPRESENTING_THE_LOCAL_DOMAIN>: icmp_seq=5 ttl=128 time=0.794 ms --- <THE_IP_REPRESENTING_THE_LOCAL_DOMAIN> ping statistics --- 5 packets transmitted, 5 received, 0% packet loss, time 4056ms rtt min/avg/max/mdev = 0.644/0.808/1.160/0.183 ms $ nslookup my.sample-domain.local Server: <THE_IP_REPRESENTING_THE_NAMESERVER> Address: <THE_IP_REPRESENTING_THE_NAMESERVER>#53 Non-authoritative answer: Name: my.sample-domain.local Address: <THE_IP_REPRESENTING_THE_LOCAL_DOMAIN> $ cat /etc/resolv.conf domain <AN_INTERNAL_DOMAIN> search <AN_INTERNAL_DOMAIN> nameserver <THE_IP_REPRESENTING_THE_NAMESERVER> nameserver <ANOTHER_IP_REPRESENTING_THE_NAMESERVER>
Meanwhile I realized there is an Ubuntu 16 Virtual Machine in the same office LAN, so I logged into it and tried the
ping command which is working there.
Also that Ubuntu VM does not have any particular custom setting in
/etc/hosts (the same as my Debian 9 laptop with not customized
/etc/resolv.conf look similar (some shared domains/IPs, some other IPs for the same domain).
However the file
/etc/nsswitch.conf is different, so I think there is something going on with this
mdsn4_minimal and the order of hosts resolution in there like
mdsn4_minimal coming before
hosts: files mdns4_minimal [NOTFOUND=return] dns
and on Ubuntu:
hosts: files dns
Both the Ubuntu 16 VM and my Debian 9 laptop are able to resolve that
.local domain using the