Ubuntu – Need help installing a DNS on Ubuntu

domain-name-systemUbuntu

I am trying to configure a DNS for an Ubuntu server. Initially I had problems pinging the server or doing any kind of dig. The relevant info up to that point is visible below under "Old Issues". Through much assistance I have gotten the DNS to respond to a ping request via its IP, and most importantly it is now acknowledging the dig -x 127.0.0.1 command.

These prior issues came about due to an error in my name server syntax in the Forward Zone File (eg. db.example.com.).

Currently the issue remains that the server can not be called by the example.com. I can only assume that this is a problem with my reference to the recursive DNS server, however I am unsure of how to fix this. All help is appreciated.

Old Issues
As per requested, below are the results for various ping requests, digs, and what is entered into bind named.config prior to any suggestions.

"ping example.com" times out and outputs: 

ping: unknown host example.com

"ping 1.2.3.4" (net ip) outputs:

10 packets transmitted, 10 received, 0% packet loss, time 8999ms
rtt min/avg/max/mdev = 0.688/0.960/3.221/0.754 ms

"ping 1.2.3.4" (local ip) outputs:

PING 192.168.1.68 (192.168.1.68) 56(84) bytes of data.
^C
--- 192.168.1.68 ping statistics ---
21 packets transmitted, 0 received, 100% packet loss, time 19999ms

"ping 4.2.2.2" outputs:

5 packets transmitted, 5 received, 0% packet loss, time 4006ms
rtt min/avg/max/mdev = 32.742/33.081/33.544/0.411 ms

bind named.conf file:

include "/etc/bind/named.conf.options";
include "/etc/bind/named.conf.local";
include "/etc/bind/named.conf.default-zones";

resolv.conf file:
version 1

nameserver 127.0.0.1
nameserver 4.2.2.2

version 2

search example.com
nameserver 192.168.1.1
nameserver 68.238.64.12

nslookup google.com

Server:         192.168.1.1
Address:        192.168.1.1#53

Non-authoritative answer:
Name:   google.com
Address: 74.125.45.100
Name:   google.com
Address: 74.125.53.100
Name:   google.com
Address: 74.125.67.100

New Issues

dig -x 127.0.0.1 this line seems to be of concern, shouldn't these 0's be 1's?

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

cat /etc/bind/named.conf.options

tail -n 100 /var/log/syslog

cat /var/log/syslog | grep bind

named.conf.local

zone "example.com"{
        type master;
        file "/etc/bind/db.example.com";
};

zone "1.168.192.in-addr.arpa" {
        type master;
        file "/etc/bind/db.233";
};

Best Answer

  1. Check you network is UP and running
  2. Check you routing and if default rote is installed ( netstat -rn )
  3. Check internet connection by pinging 4.2.2.2 ( ping 4.2.2.2 )
  4. Check your dns configs ( cat /etc/resolv.conf )
  5. Check that name resolution works with other DNS server (nslookup google.com 4.2.2.2)
  6. You can use nameserver 4.2.2.2 in your /etc/resolv.conf , if you want just name resolution working aka pinging any site by name.
  7. Share your bind named.conf, by the way, it must work out of the box as caching server.
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