18.04 does not resolve hosts on local network

Question

I recently upgraded from 16.04 to 18.04 and now I am not able to resolve hosts on my local network. With 16.04 everything worked fine.

I am still able to use IP to reach other computers but using host name gives error message:

ssh: Could not resolve hostname myhost: Name or service not known

Same result when using firefox to reach a web service on this host.

Usingnmap -sP 192.168.2.1/24 from this post will find all hosts on the network.

Any ideas?

can you edit you post to add some information? cat /etc/hosts; sudo netstat -antup | grep LISTEN; cat /var/run/systemd/resolve/resolv.conf | grep name ... Thank you — cmak.fr, Jun 05 '18 at 18:53

score 2 · Accepted Answer · answered Jun 05 '18 at 19:54

In Ubuntu the local host names have ".local" in the end

By default, Ubuntu includes avahi. This is an implementation of zeroconf which allows computer hostnames to be resolved with the virtual .local name. Based on this convention, try the command:

ssh [email protected]

If the usernames in both the computers are identical, you can leave the remoteuser@ part out end enter:

ssh myhost.local

See What does ".local" do?

Hope this helps

score 1 · Answer 2 · edited Jun 06 '18 at 05:02

1

Its your firewall configuration. Its blocking your connection.

For graphical management of the default Ubuntu firewall, install GUFW and set the out going connections to allow. For more information on how to use, read documentation here.

edited Jun 06 '18 at 05:02

mike stewart

509

answered Jun 05 '18 at 19:12

schartz

119

ya, if a firewall was enabled on 16.04, this sounds likely – mike stewart Jun 05 '18 at 21:03

18.04 does not resolve hosts on local network

2 Answers2

In Ubuntu the local host names have ".local" in the end

Linked