building a DNS system

[Sten Carlsen]

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Something else interesting:

First the response from dig, after that the response from nslookup
(notice that nslookup serves the good address first):

silver:~>dig broken.bortzmeyer.fr

; <<>> DiG 8.3 <<>> broken.bortzmeyer.fr
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 2
;; QUERY SECTION:
;;      broken.bortzmeyer.fr, type = A, class = IN

;; ANSWER SECTION:
broken.bortzmeyer.fr.   22h54m39s IN A  113.1.2.3
broken.bortzmeyer.fr.   22h54m39s IN A  80.67.170.53

;; AUTHORITY SECTION:
bortzmeyer.fr.          22h54m39s IN NS  ns1.generic-nic.net.
bortzmeyer.fr.          22h54m39s IN NS  ns1.bortzmeyer.org.

;; ADDITIONAL SECTION:
ns1.bortzmeyer.org.     6h54m41s IN A   80.67.170.53
ns1.generic-nic.net.    1d22h54m39s IN A  192.134.7.250

;; Total query time: 23 msec
;; FROM: silver.s-carlsen.dk to SERVER: default -- 192.168.14.254
;; WHEN: Wed Jul 19 15:43:36 2006
;; MSG SIZE  sent: 38  rcvd: 167

silver:~>nslookup broken.bortzmeyer.fr
Server:  christina.s-carlsen.dk
Address:  192.168.14.254

Non-authoritative answer:
Name:    broken.bortzmeyer.fr
Addresses:  80.67.170.53, 113.1.2.3

silver:~>


Looks like there IS a space for nslookup? I assume that this is what the
applications get served? No wonder it works.

I just still wonder how this swap gets done and based on what?



Stephane Bortzmeyer wrote:
> On Wed, Jul 19, 2006 at 02:47:28PM +0200,
>  Sten Carlsen <ccc2716 at vip.cybercity.dk> wrote 
>  a message of 23 lines which said:
>
>   
>> What times should we expect for loading all those images?
>>     
>
> It depends on:
>
> * wether you pick the first address (which does not work) or the
> second (which does work). Pure luck. "dig A broken.bortzmeyer.fr".
>
> * how your network infrastructure reports that the first address is
> not reachable (immediate ICMP "Network unreachable" or black
> hole?). 
>
> * how your browser reacts to this unreachability.
>
> The purpose of this little experiment is to see wether a pure DNS
> redundancy solution is realistic for HTTP (I do not think so).
>
>
>   


-- 
Best regards

Sten Carlsen

Let HIM who has an empty INBOX send the first mail.