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


"s_m_b" <smb20002ns@xxxxxxxxxxx> wrote in message
news:Xns98CA7AEA3CB8Dsmb2000nshotrmailcom@xxxxxxxxxxxxxxxx
Problem we have:
We are about to switch web servers and those in power want it to be
'seamless'. For various reasons a short ttl was rejected.

That was likely an ignorant (meaning without the knowledge to understand
the problem) 'decision'.

What possible reason would this be rejected other than failure to plan
which YOU seem to be doing?

Because we run the two servers in our dmz, the redirect from server (old)
to server (new) has to use the external ip not the internal one.

Just remove the old one, and keep them both online until the (LONG) TTL
expires and no one is still using the old one.

Whilst the external one works for the internet, we're blind from the
network (again various reasons) whilst its on, so I need to fid a way to
get the redirect ip picked up by our internal dns and somehow translated
to
its dmz one.

The way you are TRYING to do it has nothing to do with DNS -- you just
put a redirect in ALL the web pages (someone may be bookmarked deep
inside) of the old web server.

This is not the best way to do it, because playing with DNS records and
reducing the TTL is EASY.

The obvious solution, I thought, was a cname 'www2' for the internal ip
that could then be used by the A record for the external address.

No, CNAME give you two names ro ONE Server IP address.

Seems not, though. Is there another way around this one?
in simple terms we need to do

Yes, do it right -- they way you knew how to do it.

You may have to EXPLAIN this carefully to whoever it making decisions
but that is the best way to get "around this one".

'new server external address' -> 'new server internal address'
where the external one is used by IIS redirect, and networked PCs cannot
get to this address.


.

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