Domain Name System
AÏMEN HAJRI
BILEL SASSI
CONTENTS
I-INTRODUCTION
II-Configure Cache NameServer
III-Test the Cache NameServer
IV-Configure Primary/Master Nameserver
V-Build the Forward Resolution for Primary/Master NameServer
V-Build the Reverse Resolution for Primary/Master NameServer
VI-Test the DNS server
DNS is an internet service that maps IP addresses to fully qualified domain names (FQDN) and vice versa.
BIND is the most common program used for maintaining a name server on Linux.
BIND stands for Berkley Internet Naming Daemon.
INTRODUCTION
Configure Cache NameServer
The job of a DNS caching server is to query other DNS servers and cache the response. Next time when the same query is given, it will provide the response from the cache. The cache will be updated periodically.
/etc/bind/named.conf.options
forwarders {
8.8.8.8;
8.8.4.4;
};
$ sudo service bind9 restart
Test the Cache NameServer
$ dig ubuntu.com ;; Query time: 1323 msec
$ dig ubuntu.com ;; Query time: 3 msec
Configure Primary/Master Nameserver
/etc/bind9/named.conf.local.
zone "thegeekstuff.net" {
type master;
file "/etc/bind/db.thegeekstuff.net";
};
zone "0.42.10.in-addr.arpa" {
type master;
notify no;
file "/etc/bind/db.10";
};
Build the Forward Resolution for Primary/Master NameServer
$ sudo cp /etc/bind/db.local /etc/bind/db.thegeekstuff.net
$TTL 604800
@ IN SOA ns.thegeekstuff.net. lak.localhost. (
1024 ; Serial
604800 ; Refresh
86400 ; Retry
2419200 ; Expire
604800 ) ; Negative Cache TTL
;
@ IN NS ns.thegeekstuff.net.
thegeekstuff.net. IN MX 10 mail.thegeekstuff.net.
ns IN A 10.42.0.83
web IN A 10.42.0.80
mail IN A 10.42.0.70
$ sudo cp /etc/bind/db.127 /etc/bind/db.10
$TTL 604800
@ IN SOA ns.thegeekstuff.net. root.localhost. (
20 ; Serial
604800 ; Refresh
86400 ; Retry
2419200 ; Expire
604800 ) ; Negative Cache TTL
;
@ IN NS ns.
Build the Reverse Resolution for Primary/Master NameServer
Next, for each A record in :
/etc/bind/db.thegeekstuff.net, add a PTR record.
$TTL 604800
@ IN SOA ns.thegeekstuff.net. root.thegeekstuff.net. (
20 ; Serial
604800 ; Refresh
86400 ; Retry
2419200 ; Expire
604800 ) ; Negative Cache TTL
;
@ IN NS ns.
83 IN PTR ns.thegeekstuff.net.
70 IN PTR mail.thegeekstuff.net.
80 IN PTR web.thegeekstuff.net.
Test the DNS server
add the following to /etc/resolv.conf
nameserver 10.42.0.83
$ ping mail.thegeekstuff.net
PING mail.thegeekstuff.net (10.42.0.70) 56(84) bytes of data.
64 bytes from mail.thegeekstuff.net (10.42.0.70): icmp_req=1 ttl=64 time=0.482 ms
64 bytes from mail.thegeekstuff.net (10.42.0.70): icmp_req=2 ttl=64 time=0.532 ms
THANK YOU
FOR
YOUR ATTENTION
Dom
By Aimen Hajri
