9. Implementation of Split DNS[edit]

Main Configuration[edit]

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[edit]

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[edit]

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
dellc IN A 203.190.134.82
www IN A 203.190.134.82
www IN A 125.21.188.210
ftp IN CNAME dellc.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
ns IN A 203.190.134.82
ns.rdmindia.com.INA203.190.134.82
rdmindia.com.INNSns.rdmindia.com.
dellc IN A 203.190.134.82
ftp IN CNAME ns.rdmindia.com.
hr IN A 203.190.134.85
intranet IN A 203.190.134.82
projects IN A 220.227.149.66
wap IN A 203.190.134.85
dellc.rdm.co.in. IN A 203.190.134.82
dellc1.rdm.co.in. IN A 125.21.188.210
######################################################################

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.
########################################################################