Hi,
I have configured two machines in my network.
1. service1.example.com (This is my DNS server)
2. server1.example.com (This is my client machine)
When I am running nslookup server1 I get below error message.
Quote:
[root@server1 Desktop]# nslookup server1
Server: 192.168.6.254
Address: 192.168.6.254#53
** server can't find server1: SERVFAIL
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But when I run nslookup server1.example.com I get correct response.
Quote:
[root@server1 Desktop]# nslookup server1.example.com
Server: 192.168.6.254
Address: 192.168.6.254#53
Name: server1.example.com
Address: 192.168.6.101
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Same is applicable with dig command
Quote:
[root@server1 Desktop]# dig server1
; <<>> DiG 9.7.0-P2-RedHat-9.7.0-5.P2.el6 <<>> server1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 1768
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;server1. IN A
;; Query time: 7 msec
;; SERVER: 192.168.6.254#53(192.168.6.254)
;; WHEN: Sat Mar 31 05:08:38 2012
;; MSG SIZE rcvd: 25
[root@server1 Desktop]# dig server1.example.com
; <<>> DiG 9.7.0-P2-RedHat-9.7.0-5.P2.el6 <<>> server1.example.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 43085
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1
;; QUESTION SECTION:
;server1.example.com. IN A
;; ANSWER SECTION:
server1.example.com. 86400 IN A 192.168.6.101
;; AUTHORITY SECTION:
example.com. 86400 IN NS service1.example.com.
;; ADDITIONAL SECTION:
service1.example.com. 86400 IN A 192.168.6.254
;; Query time: 2 msec
;; SERVER: 192.168.6.254#53(192.168.6.254)
;; WHEN: Sat Mar 31 05:08:45 2012
;; MSG SIZE rcvd: 92
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I have below configuration for /etc/named.conf file
Quote:
[root@service1 Desktop]# cat /etc/named.conf
//
// named.conf
//
// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS
// server as a caching only nameserver (as a localhost DNS resolver only).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//
options {
listen-on port 53 { 127.0.0.1;any; };
listen-on-v6 port 53 { ::1; };
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
memstatistics-file "/var/named/data/named_mem_stats.txt";
allow-query { localhost;any;};
recursion yes;
dnssec-enable yes;
dnssec-validation yes;
dnssec-lookaside auto;
/* Path to ISC DLV key */
bindkeys-file "/etc/named.iscdlv.key";
};
logging {
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
zone "." IN {
type hint;
file "named.ca";
};
include "/etc/named.rfc1912.zones";
zone "example.com" {
type master;
file "example.com.zone";
allow-update {none;};
};
zone "6.168.192.in-addr.arpa" IN {
type master;
file "example.com.rev.zone";
allow-update {none;};
};
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forward and reverse zone files.
Quote:
[root@service1 Desktop]# cat /var/named/example.com.zone
$ORIGIN example.com.
$TTL 1D
@ IN SOA service1.example.com. amit.example.com. (
20120331 ; serial
6H ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
IN NS service1.example.com.
service1 IN A 192.168.6.254
server1 IN A 192.168.6.101
tester1 IN A 192.168.6.102
example.com. IN MX 10 server1.example.com.
[root@service1 Desktop]# cat /var/named/example.com.rev.zone
$ORIGIN 6.168.192.in-addr.arpa.
$TTL 1D
@ IN SOA service1.example.com. amit.example.com. (
20120331 ; serial
6H ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
@ IN NS service1.example.com.
101 IN PTR server1.example.com.
102 IN PTR tester1.example.com.
254 IN PTR service1.example.com.
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Please let me know if there is any mistake in configuration. I am using CentOS version 6.
Quote:
[root@service1 data]# tail -f named.run
error (network unreachable) resolving 'server1/A/IN': 128.63.2.53#53
error (network unreachable) resolving 'server1/A/IN': 192.5.5.241#53
error (network unreachable) resolving 'server1/A/IN': 193.0.14.129#53
error (network unreachable) resolving 'server1/A/IN': 198.41.0.4#53
error (network unreachable) resolving 'server1/A/IN': 199.7.83.42#53
error (network unreachable) resolving 'server1/A/IN': 202.12.27.33#53
error (network unreachable) resolving 'server1/A/IN': 192.58.128.30#53
error (network unreachable) resolving 'server1/A/IN': 192.112.36.4#53
error (network unreachable) resolving 'server1/A/IN': 192.36.148.17#53
error (network unreachable) resolving 'server1/A/IN': 192.203.230.10#53
error (network unreachable) resolving 'server1/A/IN': 192.228.79.201#53
error (network unreachable) resolving 'server1/A/IN': 192.33.4.12#53
error (network unreachable) resolving 'server1/A/IN': 128.8.10.90#53
error (network unreachable) resolving 'service1/A/IN': 128.63.2.53#53
error (network unreachable) resolving 'service1/A/IN': 192.5.5.241#53
error (network unreachable) resolving 'service1/A/IN': 193.0.14.129#53
error (network unreachable) resolving 'service1/A/IN': 198.41.0.4#53
error (network unreachable) resolving 'service1/A/IN': 192.58.128.30#53
error (network unreachable) resolving 'service1/A/IN': 199.7.83.42#53
error (network unreachable) resolving 'service1/A/IN': 202.12.27.33#53
error (network unreachable) resolving 'service1/A/IN': 192.112.36.4#53
error (network unreachable) resolving 'service1/A/IN': 192.36.148.17#53
error (network unreachable) resolving 'service1/A/IN': 192.228.79.201#53
error (network unreachable) resolving 'service1/A/IN': 192.33.4.12#53
error (network unreachable) resolving 'service1/A/IN': 192.203.230.10#53
error (network unreachable) resolving 'service1/A/IN': 128.8.10.90#53
error (network unreachable) resolving 'tester1/A/IN': 128.63.2.53#53
error (network unreachable) resolving 'tester1/A/IN': 192.5.5.241#53
error (network unreachable) resolving 'tester1/A/IN': 193.0.14.129#53
error (network unreachable) resolving 'tester1/A/IN': 198.41.0.4#53
error (network unreachable) resolving 'tester1/A/IN': 192.58.128.30#53
error (network unreachable) resolving 'tester1/A/IN': 199.7.83.42#53
error (network unreachable) resolving 'tester1/A/IN': 202.12.27.33#53
error (network unreachable) resolving 'tester1/A/IN': 192.36.148.17#53
error (network unreachable) resolving 'tester1/A/IN': 192.112.36.4#53
error (network unreachable) resolving 'tester1/A/IN': 192.203.230.10#53
error (network unreachable) resolving 'tester1/A/IN': 128.8.10.90#53
error (network unreachable) resolving 'tester1/A/IN': 192.228.79.201#53
error (network unreachable) resolving 'tester1/A/IN': 192.33.4.12#53
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