Hi,
Len is completely right, the best way to avoid future problems is to give
each service a different domain name in the first place. Also the earlier
you make a change like this the less painful it will be in the long term.
If you do end up in the situation of having all your services pointing to
the same domain name one solution which is a little expensive but works well
is to use a Cisco Localdirector. This is more commonly known for it's load
balancing, however it just a very configurable network bridge.
It can accept traffic on one IP address and farm it off to completely
different servers dependent on the port that the traffic specifies, very
useful for getting over legacy domain name problems. Not sure if you have
these sorts of problems but if people don't heed Len's excellent advise then
they will have them eventually.
My �.02 worth
Steve
Steven Moore
Internet Development Engineer
Research Machines
+44 1235 823522
-----Original Message-----
From: Len Conrad [mailto:[EMAIL PROTECTED]]
Sent: 03 August 2000 18:30
To: [EMAIL PROTECTED]
Subject: RE: [IMail Forum] Speaking of domain names
>Wow, I hope this helps, because, frankly, I don't see how this applies to
>the problem at hand. Further, I really hope other people out there don't
>feel the need to create a dns entry for each subdomain (smtp, pop3, imap4,
>webmail)!
Better to think of them as "virtual hosts" or "virtual machines" rather
than "subdomains".
The more you have now, even if they point now to the same ip, the more
flexibility you have "behind" the hostnames to change the ip in the future
WITHOUT requiring the users to change their mail and address book settings.
The DNS system and virtual servers like Imail have great flexibility, why
not think forward a bit and use the flexbility now?
ie, let's say Ipswitch in Imail7 allows webmail to be on a different
machine from the SMTP/POP3 service (all aboard, the bandwagon is leaving
the station!!) or they don't do that but you find another solution that
does, but you have told all your x 1000's users that both SMTP and webmail
are at all piled up behind boring old mail.domain.com?
You have to get them all to change their programs when you are able to
offer them:
smtp.domain.com for their SMTP AUTH server for outbound mail (this could be
send-only mail gateway, not even Imail)
and
pop3.domain.com to pick up their mail (Imail "mailbox server")
and
http://webmail.domain.com as the URL for the Web messaging service, an
Imail HTTP server app + machine that POPs the mail from pop3.domain.com
machine.
Len
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