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On Fri, 11 May 2007, Dr. Volker Jaenisch wrote:
It would be a violation of the DNS if a ISP caches the
domain entries longer as the TTL.
I haven't looked for 10yrs or so, but back then DNS servers
would not honour a TTL less than some reasonably long time
(a day?) so their cache would be useful.
Have you tested this? Our two big ISPs in germany respect the TTL set by the
domain provider.
mira2:~# dig @195.50.140.250 inqbus.de
;; ANSWER SECTION:
inqbus.de. 300 IN A 193.239.28.142
mira2:~# dig @195.50.140.250 inqbus.de
; <<>> DiG 9.2.4 <<>> @195.50.140.250 inqbus.de
;; ANSWER SECTION:
inqbus.de. 297 IN A 193.239.28.142
I take it that the situation is different nowadays. What's
the point of having DNS servers if every query requires a
hit to the root servers?
Joe
--
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!
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