On 12/11/13 09:41, Tim wrote:
I get about a quarter or third of that time if I try other DNS servers.
My own took 1500 mS the first time, then 6 ms for subsequent attempts
(local cache is much quicker than internet propagation delays). Queries
for other addresses took about 100 mS, so the BBC query must have been
answered by something further away. My server checks it cache, then (if
it doesn't have an answer) goes out to the root servers (to find out who
would know the answer), then whatever servers the roots tell it, like a
proper traditional DNS server.
I consider 1.5 secs for a response to be unusually long. I couldn't put
up with that, or worse, consistently.
I changed the router configuration to use 208.67.229.220:5353 and
208.67.222.222:5353 and see the following:
[root@box10 bobg]# dig www.bbc.co.uk
; <<>> DiG 9.9.3-rl.13207.22-P2-RedHat-9.9.3-5.P2.fc19 <<>> www.bbc.co.uk
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35870
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;www.bbc.co.uk. IN A
;; ANSWER SECTION:
www.bbc.co.uk. 176 IN CNAME www.bbc.net.uk.
www.bbc.net.uk. 182 IN A 212.58.246.93
www.bbc.net.uk. 182 IN A 212.58.246.92
;; Query time: 616 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Tue Nov 12 11:46:20 EST 2013
;; MSG SIZE rcvd: 100
As you say the cache is much faster, 2 ms as opposed to 616 ms.
But I still don't know what DNS address it actually goes to, how do I
find that?
--
http://www.qrz.com/db/W2BOD
box10 Fedora-19/64 bit Linux/XFCE
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