9. Implementation of Split DNS

Edit the file /etc/named.conf as follows and make sure internal and external view are created which I have marded in red.

vi /etc/named.conf

###################################################################

// named.conf for Red Hat caching-nameserver

//

acl loc {127.0.0.1/8; 10.10.1.0/21; 10.10.2.0/21; 10.10.3.0/21; };

options {

directory "/var/named";

dump-file "/var/named/data/cache_dump.db";

statistics-file "/var/named/data/named_stats.txt";

allow-query { loc;};

allow-recursion { loc;};

forwarders {202.56.240.5; 202.56.250.5; 4.2.2.2; };

/*

* If there is a firewall between you and nameservers you want

* to talk to, you might need to uncomment the query-source

* directive below. Previous versions of BIND always asked

* questions using port 53, but BIND 8.1 uses an unprivileged

* port by default.

*/

// query-source address * port 53;

};

//

// a caching only nameserver config

//

controls {

inet 127.0.0.1 allow { localhost; } keys { rndckey; };

};

view "inside" {

match-clients { loc; };

recursion yes;

zone "." IN {

type hint;

file "named.root";

};

zone "0.0.127.in-addr.arpa" IN {

type master;

file "named.local";

allow-update { none; };

};

zone "rdm.co.in" IN {

type master;

file "rdm.co.in.int.zone";

allow-update { none; };

allow-query { any; };

};

zone "rdmindia.com" IN {

type master;

file "rdmindia.com.int.zone";

allow-update { none; };

allow-query { any; };

};

zone "rdmfamily.in" IN {

type master;

file "rdmfamily.in.zone";

allow-update { none; };

allow-query { loc; };

};

zone "1.10.10.in-addr.arpa" IN {

type master;

file "rdmfamily.in.local";

allow-update { none; };

allow-query { loc; };

};

zone "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa" IN {

type master;

file "named.ip6.local";

allow-update { none; };

};

zone "255.in-addr.arpa" IN {

type master;

file "named.broadcast";

allow-update { none; };

};

zone "0.in-addr.arpa" IN {

type master;

file "named.zero";

allow-update { none; };

};

view "outside" {

match-clients { !loc; any; };

recursion no;

zone "rdm.co.in" IN {

type master;

file "rdm.co.in.ext.zone";

allow-update { none; };

allow-query { any; };

};

zone "rdmindia.com" IN {

type master;

file "rdmindia.com.ext.zone";

allow-update { none; };

allow-query { any; };

};

zone "188.21.125.in-addr.arpa" IN {

type master;

file "rdm.co.in.local";

allow-update { none; };

allow-query { any; };

};

include "/etc/rndc.key";

Make entries in /var/named/chroot/var/named/.

Internal Views

vi rdm.co.in.int.zone

###########################################################

$TTL 86400

@ IN SOA dellc1.rdm.co.in. admin.rdm.co.in. (

2008070201 ; Serial

28800 ; Refresh

14400 ; Retry

3600000 ; Expire

86400 ) ; Minimum

IN NS dellc.rdm.co.in.

IN NS dellc1.rdm.co.in.

rdm.co.in. IN A 10.10.1.9

rdm.co.in. IN A 10.10.1.10

mailserver.rdm.co.in.INA10.10.1.2

sambaPDC.rdm.co.in.INA10.10.1.15

sambaBDC.rdm.co.in.INA10.10.1.16

dellcINA10.10.1.1

dellc1INA 10.10.1.8

wwwINA10.10.1.8

wwwINA10.10.1.1

ftpINCNAMEdellc.rdm.co.in.

#######################################################################

vi rdmindia.com.int.zone

######################################################################

$TTL 86400

@ IN SOA dellc1.rdm.co.in. admin.rdm.co.in. (

2008060501 ; Serial

28800 ; Refresh

14400 ; Retry

3600000 ; Expire

86400 ) ; Minimum

IN NS dellc.rdm.co.in.

IN NS dellc1.rdm.co.in.

rdmindia.com. IN A 10.10.1.9

rdmindia.com. IN A 10.10.1.10

ns.rdmindia.com.INA 10.10.1.8

rdmindia.com.INNSns.rdmindia.com.

ftpINCNAMEns.rdmindia.com.

hrINA203.190.134.85

dellc.rdm.co.in.INA10.10.1.8

dellc1.rdm.co.in.INA10.10.1.1

#####################################################################

vi rdmfamily.in.zone

###################################################################

$TTL 86400

@ IN SOA dns1.rdm.co.in. admin.rdm.co.in. (

2008060501 ; Serial

28800 ; Refresh

14400 ; Retry

3600000 ; Expire

86400 ) ; Minimum

IN NS dns1.rdm.co.in.

IN NS dns2.rdm.co.in.

rdmfamily.in. IN A 10.10.1.1

rdmfamily.in. IN A 10.10.1.8

ib.rdmfamily.in. IN A 10.10.2.250

dns1.rdm.co.in. INA 10.10.1.1

dns2.rdm.co.in. INA 10.10.1.8

###########################################################################

vi rdmfamily.in.local

#########################################################################

$TTL 86400

@ IN SOA dns1.rdm.co.in. admin.rdm.co.in. (

2008051701 ; Serial

28800 ; Refresh

14400 ; Retry

3600000 ; Expire

86400 ) ; Minimum

IN NS dns1.rdm.co.in.

IN NS dns2.rdm.co.in.

1 IN PTR rdmfamily.in.

8 IN PTR rdmfamily.in.

250 IN PTR ib.rdmfamily.in.

2 IN PTR mailserver.rdm.co.in.

##########################################################################

External views

vi rdm.co.in.ext.zone

##########################################################################

$TTL 86400

@ IN SOA dellc1.rdm.co.in. admin.rdm.co.in. (

2008070201 ; Serial

28800 ; Refresh

14400 ; Retry

3600000 ; Expire

86400 ) ; Minimum

IN NS dellc.rdm.co.in.

IN NS dellc1.rdm.co.in.

rdm.co.in. IN A 203.190.134.82

rdm.co.in. IN A 125.21.188.210

mail1.rdm.co.in.INA203.190.134.89

mail2.rdm.co.in.INA125.21.188.210

rdm.co.in. IN MX 1mail1.rdm.co.in.

rdm.co.in. IN MX 10mail2.rdm.co.in.

mailserver.rdm.co.in.INA203.190.134.83

dellcINA203.190.134.82

wwwINA203.190.134.82

wwwINA125.21.188.210

ftpINCNAMEdellc.rdm.co.in.

www.rdm.co.in.INA203.190.134.82

www.rdm.co.in.INA125.21.188.210

dellc.rdm.co.in.INA203.190.134.82

dellc1.rdm.co.in.IN A125.21.188.210

###########################################################################

vi rdminida.com.ext.zone

$TTL 86400

@ IN SOA dellc1.rdm.co.in. admin.rdm.co.in. (

2008060501 ; Serial

28800 ; Refresh

14400 ; Retry

3600000 ; Expire

86400 ) ; Minimum

IN NS dellc.rdm.co.in.

IN NS dellc1.rdm.co.in.

rdmindia.com. IN A 203.190.134.82

rdmindia.com. IN A 125.21.188.210

rdmindia.com.INMX1203.190.134.89.

rdmindia.com.INMX10125.21.188.210.

mailserver.rdm.co.in.INA203.190.134.83

nsINA203.190.134.82

ns.rdmindia.com.INA203.190.134.82

rdmindia.com.INNSns.rdmindia.com.

dellcINA203.190.134.82

ftpINCNAMEns.rdmindia.com.

hrINA203.190.134.85

intranetINA203.190.134.82

projectsINA220.227.149.66

wapINA203.190.134.85

dellc.rdm.co.in.INA203.190.134.82

dellc1.rdm.co.in.INA125.21.188.210

######################################################################

vi rdm.co.in.local

###########################################################################

$TTL 86400

@ IN SOA dellc1.rdm.co.in. admin.rdm.co.in. (

2008051701 ; Serial

28800 ; Refresh

14400 ; Retry

3600000 ; Expire

86400 ) ; Minimum

IN NS dellc.rdm.co.in.

IN NS dellc1.rdm.co.in.

210 IN PTR rdmindia.com.

210 IN PTR dellc1.rdmindia.com.

210 IN PTR www.rdmindia.co.in.

210 IN PTR ns.rdmindia.com.

210 IN PTR rdm.co.in.

210 IN PTR dellc1.rdm.co.in.

210 IN PTR rdm.co.in.

########################################################################