Re: can dns take 1 ip and use cname to trans?


"ProAm" <snowdonconsultants@xxxxxxxxx> wrote in message
news:e0tsB7tRHHA.920@xxxxxxxxxxxxxxxxxxxxxxx
s_m_b wrote:
Hey s_m_b, I and many others here have learned like 'everything' from
these guys [Herb, Kevin, Jorge etc - thanks], never any malice.

If I understand correctly, you [plural] are not in control of your dns
i.e. your ISP is the dns admin? When you say that the ISP needs several
hours notice, is that for one of their tech guys to physically alter the
dns or is that period of notice due to some other reason?

The optimum situation is for you/your tech to have admin access to both
the web and dns servers.

This is one of the main reasons that I always suggest the REGISTRAR
is a better place than an ISP to host DNS.

Most registrars give the owner of the name a web page to configure their
own entries.

It isn't perfect for two reasons, but it is under the "owner's control":

1) Most of these have a delay from change to autoupdate of the DNS
servers

2) TTL which is cached by other servers resolving your names.


Planning ahead would have the new web server online in the dmz and tested
from inside/outside. As Herb says, the dns changes are very quick and easy
to do, provided it's in-house and not via a 3rd party.

They can also be automated by a script (DNScmd.exe), and could work
off a "monitor" script that somehow analyzes the paths to/from the
Internet.

This still leaves (at least) the problem of TTL needing to expire on
"foreign
servers".

--
Herb Martin, MCSE, MVP
http://www.LearnQuick.Com
(phone on web site)


.

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