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DNS server name to ip resolve problem
Dear All,
I have configured the dns server for local environment with domain name of my choice like ns.redhat.com, and ip address of 192.168.20.19 and subnet mask (255.255.255.0).When i run command like nslookup, host, dig to see the reponse of my dns. I get the right answer like show below 1 nslookup 192.168.20.19 Server: 192.168.20.19 Address: 192.168.20.19#53 19.20.168.192.in-addr.arpa name = ns.redhat.com. 2 host 192.168.20.19 19.20.168.192.in-addr.arpa domain name pointer ns.redhat.com. 3 dig -x 192.168.20.19 ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> -x 192.168.20.19 ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18529 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;19.20.168.192.in-addr.arpa. IN PTR ;; ANSWER SECTION: 19.20.168.192.in-addr.arpa. 86400 IN PTR ns.redhat.com. ;; AUTHORITY SECTION: 20.168.192.in-addr.arpa. 86400 IN NS ns.redhat.com. ;; Query time: 1 msec ;; SERVER: 192.168.20.19#53(192.168.20.19) ;; WHEN: Thu Dec 3 18:50:10 2009 ;; MSG SIZE rcvd: 85 But when i ask reverse question to my dns it give follwoing error or response which is not desirable. I mean it should give corresponding ip address of the ns.redhat.com that is 192.168.20.19 1 nslookup ns.redhat.com Server: 192.168.20.19 Address: 192.168.20.19#53 ** server can't find ns.redhat.com: SERVFAIL 2 host ns.redhat.com Host ns.redhat.com not found: 2(SERVFAIL) 3 dig ns.redhat.com ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> ns.redhat.com ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 51614 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;ns.redhat.com. IN A ;; Query time: 1 msec ;; SERVER: 192.168.20.19#53(192.168.20.19) ;; WHEN: Thu Dec 3 18:53:12 2009 ;; MSG SIZE rcvd: 31 These are my named.conf, forward zone and reverse zone files. cat /etc/named.conf options { directory "/var/named"; /* * 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; allow-query { localhost; 192.168.20.0/24; }; // query range allow-transfer { localhost; 192.168.20.0/24; }; // transfer range allow-recursion { localhost; 192.168.20.0/24; }; // recursion range }; controls { inet 127.0.0.1 allow { localhost; } keys { rndckey; }; }; // here is the section for internal informations view "internal" { match-clients { localhost; 192.168.20.0/24; }; zone "." IN { type hint; file "named.ca"; }; zone "redhat.com" IN { type master; file "redhat.com.lan"; allow-update { none; }; }; zone "20.168.192.in-addr.arpa" IN { type master; file "20.168.192.db"; allow-update { none; }; }; zone "localdomain" IN { type master; file "localdomain.zone"; allow-update { none; }; }; zone "localhost" IN { type master; file "localhost.zone"; allow-update { none; }; }; zone "0.0.127.in-addr.arpa" IN { type master; file "named.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; }; }; }; include "/etc/rndc.key"; Forward Zone File /var/named/redhat.com.lan. $TTL 86400 @ IN SOA ns.redhat.com. root.ns.redhat.com. ( 42 ; serial (d. adams) 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum IN NS ns.redhat.com. IN A 192.168.20.19 IN MX 10 ns.redhat.com. ns.redhat.com. IN A 192.168.20.19 Reverse Zone File /var/named/20.168.192.db $TTL 86400 @ IN SOA ns.redhat.com. root.redhat.com. ( 42 ; serial (d. adams) 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum IN NS ns.redhat.com. IN PTR ns.redhat.com. IN A 255.255.255.0 19 IN PTR ns.redhat.com. This is my resolv.conf This is /etc/resolv.conf nameserver 192.168.20.19 Thankyou in Advance |
Quote:
Try this... ===================== $TTL 86400 @ IN SOA ns.redhat.com. root.ns.redhat.com. ( 42 ; serial (d. adams) 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum @ IN A 192.168.20.19 ns IN A 192.168.20.19 IN A 192.168.20.19 IN MX 10 ns.redhat.com. =============================== |
Actually dear this does not work which you tell me above for my dns server it shows follwoing error when i restart named service
/etc/init.d/named restart Stopping named: [ OK ] Starting named: Error in named configuration: zone redhat.com/IN: has no NS records internal/redhat.com/IN: bad zone zone 20.168.192.in-addr.arpa/IN: loaded serial 42 zone localdomain/IN: loaded serial 42 zone localhost/IN: loaded serial 42 zone 0.0.127.in-addr.arpa/IN: loaded serial 1997022700 zone 255.in-addr.arpa/IN: loaded serial 42 zone 0.in-addr.arpa/IN: loaded serial 42 [FAILED] |
Quote:
$TTL 86400 @ IN SOA ns.redhat.com. root.redhat.com. ( 42 ; serial (d. adams) 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum IN NS ns.redhat.com. 19 IN PTR ns.redhat.com. I have something like this configured on my server. |
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