[Nlnog] TTL ignoren

Sabri Berisha sabri at cluecentral.net
Tue Apr 19 15:51:53 UTC 2005


Een interessante discussie op /.


cluge asks: "It seems that several large providers give their users DNS
servers that simply ignore DNS time to live (TTL). Over the past decade
I've seen this from time to time. Recently it seems to be a pandemic,
affecting very large cable/broadband and dial up networks. Performing a
few tests against our broadband cable provider has shown that only one
of the three provided DNS servers picked up a change in seven days or
less. After turning in a trouble ticket with that provider - two of the
three provided DNS servers were responding correct - while the third was
still providing bad information more than two weeks after that specific
change. What DNS caches ignore TTL by default? Is there a valid
technical reason to ignore TTL?"

Sabri Berisha, 			- CCNA, JNCIA #747
Internetworking Professional	- +31 (0) 6 19890416
http://www.cluecentral.net	- http://www.virt-ix.net

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