full-disclosure - Re: Server Redundancy

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Message-ID: <Pine.LNX.4.64.0608091748340.29954@catbert.rellim.com>
Date: Wed, 9 Aug 2006 17:52:45 -0700 (PDT)
From: "Gary E. Miller" <gem@...lim.com>
To: Sec Bas <secbas@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Server Redundancy

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Yo Sec!

On Wed, 9 Aug 2006, Sec Bas wrote:

> I was thinking about doing this with Dynamic
> DNS and using rsync to replicate changes.

Dynamic DNS will not provide the response you are looking for.  Many
browsers cache DNS for 30 mins or more regardless of your TTL.  Many
ISPs cache DNS for a day or two regardless of your TTL.  My expererience
is that it takes up to 2 days before a DNS change fully propogates even
with a TTL of 5 mins.  In some pathological cases I have seen it take 6
months.

RGDS
GARY
- ---------------------------------------------------------------------------
Gary E. Miller Rellim 20340 Empire Blvd, Suite E-3, Bend, OR 97701
	gem@...lim.com  Tel:+1(541)382-8588

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