[thelist] isp dns caches not updating

[John Handelaar]

> -----Original Message-----
> From: thelist-admin at lists.evolt.org
> [mailto:thelist-admin at lists.evolt.org]On Behalf Of Liz Lawson
> Sent: 09 October 2000 16:21
> To: thelist at lists.evolt.org
> Subject: [thelist] isp dns caches not updating
>
>
> Hi
>
> Recently we switched our hosting providers, which meant that we were no
> longer at our old IP number.
>
> The previous site is still on the old server, and we still have ftp access
> to it. After almost three weeks, we are still getting hits in the
> log files.
>
> I know that it can take a few days for an IP change to trickle
> through, but
> three weeks seems a bit extreme. Do ISPs really update their DNS caches so
> infrequently, or am I overlooking another problem?
>
> The domains in the logs include (but are limited to)
>
> tnt-3-113.easynet.co.uk
> host62-7-99-89.btinternet.com
> cache-ra05.proxy.aol.com

This is a proxy server thing, rather than
a DNS thing. A proxy won't bother updating
its records in some cases unless the page
actually changes.

This ought to hurry them up a little...

Replace the front page of the old copy with
a redirect to the numeric address of the new
one, and set it to not cache.

Or, just put up a message telling users
to Shift-Refresh the page. Or some combination
of the two.

If there aren't many accesses coming through,
I'm not sure I'd worry about it.

[Asks the group] I suspect that dumping the
old site entirely would probably also fix
this, but am I right?

------------------------------------------
John Handelaar

T +44 20 8933 1494       M +44 7930 681789
F +44 870 169 7657   E john at userfrenzy.com
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