4 Mar
2014
4 Mar
'14
9:16 a.m.
Am 04.03.2014 05:19, schrieb William Herrin:
Reasons why dynamic DNS fails to perform as expected include:
* Web browser DNS pinning can result in a customer's web browser holding the old IP address indefinitely.
* Host-level caching of looked up names which discards the TTL. Remember: your desktop or laptop performs lookups against multiple name services, e.g. DNS, /etc/hosts, lmhosts, NIS+. DNS TTL is no longer in scope once the name to address map enters the generic host lookup mechanism. Most OSes have a fixed timeout of one sort or another, some old ones as long as 24 hours.
* Eyeball ISPs' DNS resolvers might tamper with TTL values. -- SEBASTIAN SPIES lnked.in/sspies vastly.de