Very primary questions?

Joseph S D Yao jsdy at cospo.osis.gov
Fri Sep 10 16:07:00 UTC 1999


> I am an (unexperienced) webmaster and such are my doubts:

Suggest classes in, at least, DNS, e-mail/sendmail, Web, and News.

> 1)I have the www.vipline.com domain. My company is now developing a web
> business site and I have to offer our clients some sort of
> http://clientname.vipline.com domain (nowadays, I can only get my
> clients a www.vipline.com/clientname URL...) I guess that's not done
> through DNS. Is that a server feature? I use the Apache server under
> Linux, but I couldn't find something to help me doing such thing using
> it.

Apache feature - virtual hosting.  If you have IP to spare, can be done
via multiple IP addresses; or, more likely, through name differentiation.
DNS comes in because you DO have to declare all of these names through
your name servers, wherever they are.  Nutecnet.com.br?

> 2)Subscribing to a local magazine, I have received a reply message
> posted to the newreader at vipline.com address - but such thing DOES NOT
> exist! It has, though, successfully come to my marcio at vipline.com
> address. I tried sending this newreader at vipline.com a message, but I
> got a DNS error - i.e. it doesn't really exists...

Your mail headers can lie to you.  Have you ever received SPAM where
the "From: " and "To: " addresses were totally bizarre and unusable?
They can be set to anything the sender wants, and not necessarily the
reality.  Real to/from delivery information is carried out of band, but
may sometimes be inserted into the "Received: " lines.

--
Joe Yao				jsdy at cospo.osis.gov - Joseph S. D. Yao
COSPO/OSIS Computer Support					EMT-B
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