[SOLVED] Laptop doesn't recognize Desktop

Dornith · 03-21-2013, 10:25 AM

I have a laptop running Ubuntu and a desktop running Arch. I'm working out a project (non-curricular) which requires getting a Java serve application to connect to a client application.

I have a test program written and running for the server, but when I try the client, I just get an UnknownHostException.

I tried pinging my desktop and it worked fine, but when I tried:

Code:

nslookup 192.168.0.49

I just got:

Code:

Server:		127.0.0.1
Address:	127.0.0.1#53

** server can't find 49.0.168.192.in-addr.arpa.: NXDOMAIN

I also tried host and got:

Code:

Host 49.0.168.192.in-addr.arpa. not found: 3(NXDOMAIN)

I really don't understand what's going on.

Also, why is it printing my ip backwards?

Edit: I managed to get the program working by using my ip address instead of my host name

corp769 · 03-27-2013, 03:30 PM

This is happening because this is expected; You will need to add your computers/servers/devices to your hosts file, if you do not have a local DNS server on your network. (192.168.0.49 is a class C address; you will not find a class C address in normal DNS). Here is my /etc/hosts file:

Code:

127.0.0.1       localhost.localdomain   ltp01 localhost
::1             localhost.localdomain   ltp01 localhost

As you can see, you can add more addresses and hostnames in here, and just as long as you have the devices mapped in /etc/hosts, you will then be able to resolve them fully and connect via hostname. For example:

Code:

127.0.0.1       localhost.localdomain   ltp01 localhost
::1             localhost.localdomain   ltp01 localhost
192.168.2.10    server01
192.168.2.35    iphone_dev

Now that is just an example, but I hope you understand better.

Cheers,

Josh