[oclug] re: google
wisq-oclug at wisq.net
Tue Mar 29 17:09:35 EST 2005
On Tue, Mar 29, 2005 at 04:43:10PM -0500, chris h wrote:
> Well how I understand it, its that DNS services are all cached via the subnet
> that you enter the rogers system on. Quite often something barfs (used to be
> about once a month a year or two ago) on the hardware side and it was common
> to need to surf via IP on rogers until some service lad or gal went out to
> the slnt1 shub or head end shub and rebooted that sucker. Used to happen all
> the time a while back.
Okay, so their DNS can fail . . .
> Im no expert on how rogers does things,(no one that I pay seems to be either)
> but its indicative that some caching is in effect as all traceroutes over the
> past few days and even now that it works again provide the same routes to
> google which should not be the case.
. . . but here's what I was asking about. See, DNS doesn't actually
affect routing at all. DNS is purely for mapping names to numbers and
numbers to names. Once you're actually out there routing packets
(numbers only), DNS has no effect whatsoever.
In fact, originally, there was no DNS; it only arose when enough
systems joined the Internet that the sysadmins got tired of handling
huge /etc/hosts files and realised they needed a centralised authority
to do that for them.
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