By mechnotech
Please, help.
- I created subdomain dns.emercoin.com, and assigned two custom NS servers to it: seed1.emercoin.com seed2.emercoin.com
It is work. When I test it with dig, answer correct: [olegh@bsd ~]$ dig dns.emercoin.com NS ;; ANSWER SECTION: dns.emercoin.com. 1229 IN NS SEED2.emercoin.com. dns.emercoin.com. 1229 IN NS SEED1.emercoin.com.
- I run on both servers a prototype of my specialized DNS. This is custom program, works with UDP only, and support DNS from my own DB.
If I ask for DNS-record directly from that server, it works, too:
[olegh@bsd ~]$ dig @SEED2.emercoin.com aaa.dns.emercoin.com ;; ANSWER SECTION: aaa.dns.emercoin.com. 4001 IN A 192.168.0.120 aaa.dns.emercoin.com. 4001 IN A 127.0.0.1
(answer IPs aren’t correct, this is for test only)
Thus, my custom DNS server works.
- When I request same record from my local DNS, request is not reached my custom NS servers, and I receive an empty answer:
[olegh@bsd ~]$ dig aaa.dns.emercoin.com
; <<>> DiG 9.8.3-P4 <<>> aaa.dns.emercoin.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 50374 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION: ;aaa.dns.emercoin.com. IN A
;; AUTHORITY SECTION: dns.emercoin.com. 430 IN SOA SEED1.emercoin.com. hostmaster.dns.emercoin.com. 1411503131 3600 900 1209600 1800
;; Query time: 5 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Tue Sep 23 18:55:56 2014 ;; MSG SIZE rcvd: 91
Can you help me to understand, why DNS requests are not reached my name servers?
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How it should be set up:
- Create NS record for dns.emercoin.com in the zone file that handles emercoin.com
- Remove any and all sub-domains/A/MX records at said DNS provider that handles emercoin.com for dns.emercoin.com and *.dns.emercoin.com
- create zone file (assuming BIND) for dns.emercoin.com
- add zone in /etc/bind/named.conf.local . It will look something like this:
zone "dns.emercoin.com" {
type master;
file "/etc/bind/zone.dns.emercoin.com";
};
zone file should look something like this:
$TTL 500
;$ORIGIN dns.emercoin.com.
@ SOA localhost. root.localhost. (
300100000 ; serial
21600 ; refresh after 6 hours
3600 ; retry after 1 hour
604800 ; expire after 1 week
86400 ) ; minimum TTL of 1 day
;
;
@ IN NS localhost.
aaa IN A 192.168.0.120
bbb IN A 192.168.0.121
ccc IN A 192.168.0.122
I hope this helps you out.
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