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ISP inbound failover without BGP
- Subject: ISP inbound failover without BGP
- From: s+Mailinglisten.nanog at sloc.de (Sebastian Spies)
- Date: Tue, 04 Mar 2014 15:16:19 +0100
- In-reply-to: <CAP-guGWg3HWC+5W54rAN0ycX=FfZQt2-B3Kf-8zrXL7dadpboA@mail.gmail.com>
- References: <[email protected]> <CAP-guGWg3HWC+5W54rAN0ycX=FfZQt2-B3Kf-8zrXL7dadpboA@mail.gmail.com>
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