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    PaulHowarth/Blog/2009-11-12

Thursday 12th November 2009

btinternet.com

The btinternet.com domain effectively fell off the Internet - DNS queries for the domain came back NXDOMAIN (i.e. no such domain): 

$ dig @a.GTLD-SERVERS.NET btinternet.com ns

; <<>> DiG 9.6.1-P1-RedHat-9.6.1-6.P1.fc11 <<>> @a.GTLD-SERVERS.NET btinternet.com ns
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 3961
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;btinternet.com.                        IN      NS

;; AUTHORITY SECTION:
com.                    900     IN      SOA     a.gtld-servers.net. nstld.verisign-grs.com. 1258018026 1800 900 604800 86400

;; Query time: 135 msec
;; SERVER: 192.5.6.30#53(192.5.6.30)
;; WHEN: Thu Nov 12 09:27:29 2009
;; MSG SIZE  rcvd: 105

This is an authoritative response from the main DNS server for .com domains.

I discovered the problem as a result of mail for btinternet.com addresses bouncing on my mail server. At first I assumed it was a problem at my end but further investigation revealed that not to be the case.

I did a whois lookup on the btinternet.com domain and that returned sane values, including the DNS servers that should be handling the domain: 

   Domain servers in listed order:

   RBSDNS04.BT.NET              213.123.21.244
   RBSDNS02.BT.NET              213.123.27.212
   RBSDNS03.BT.NET              213.123.21.243
   RBSDNS01.BT.NET              213.123.27.211

The issue is now resolved but the workaround I used in the meantime was to fix my local nameserver (ISC BIND) to forward queries for btinternet.com addresses to the addresses listed above: 

        // btinternet.com fell off Internet
        zone "btinternet.com" {
                type forward;
                forward only;
                forwarders { 213.123.21.243; 213.123.21.244; 213.123.27.211; 213.123.27.212; };
        };

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