I'm running Ubuntu 18.04 on my laptop. I am trying to ping other computers on my local network using their hostname but it's not working.

$ ping ubuntudesktop
ping: ubuntudesktop: Name or service not known

I have the name servers for the wifi adapter set up as follows:Wifi adapter DNS settings

I am snooping the wifi packets using wireshark and I do not see any DNS query when I run the ping command. Why are these nameservers not being used?

On a side note - when I use nslookup for google.com for example I get the following:

$ nslookup google.com
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
Name: google.com
Address: 172.217.14.238
Name: google.com
Address: 2607:f8b0:400a:803::200e

I am assuming Server is the address of the DNS server? Isn't 127.0.0.53 an address for the loopback interface? Would this mean it's essentially querying itself?

2

1 Answer

127.0.0.53 is the address used by systemd-resolved.service

tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN 1224/systemd-resolv
udp 0 0 127.0.0.53:53 0.0.0.0:* 1224/systemd-resolv 

Hostnames of other computers will not be resolved trough the DNS service.

You need to specify them in /etc/hosts statically.

Example:

127.0.0.1 localhost
127.0.1.1 mypc
192.168.1.100 ubuntudesktop

You can edit this file trough sudo

sudo editor /etc/hosts

6

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