[lug] Virtual Hosting and DNS

[jdavis]

On Wed, 2002-12-18 at 21:48, Michael Shuler wrote:
> jdavis wrote:
> >  it appears to be ok to have multiple  
> >  A records for a IP addy ,But it looks like the common method
> 
> Multiple A records are fine - I do not believe this really matters, 
> other than 'standard practice' for a DNS admin.
> 
> >  of DNS setup for name-based virt web hosts is to use CNAME.
> > 
> > #############################################################
> >   i.e.
> >   second_domain.com CNAME first_domain.bz
> > 
> 
> Hmm - now in the small amount of DNS I have done, your example would 
> seem to translate to:
> 
> second_domain.com.first_domain.bz -> is an alias for first_domain.bz

almost...its actually
www IN A 1.2.3.4
totally_different.domain.net IN CNAME www

where 1.2.3.4 is the ip hosting multiple domains...not sub domains

> ...if this is contained in the zonefile for first_domain.bz. I see what 
> you are going for, but this does not work in the zone file for 
> first_domain.bz, since second_domain.com is still not a resolvable FQDN.
> 
> >   or
> >   
> >   second_domain.com  A   1.2.3.4
> > 
> >  where 1.2.3.4 is also the IP of first_domain.bz and
> >  first_domain.bz is the primary domain hosting all others.
> > 
> > #############################################################
> > 
> > Are there pros or cons to either way as far as HTTP and SMTP
> > are concerned.
> 
> DNS is merely translating a name to a number.  If you get to the number 
> one way or another, I do not believe it makes much of a difference on 
> the small scale.  If an IP/DNS admin would like to chime in, please, 
> extoll the virtues of proper zone juju on the large scale.  :)
> 
> Michael
> 

 thanks for the help
 jd