Cnames and "virtual name based hosting"

[Stephane Bortzmeyer]

On Wed, Apr 07, 2004 at 10:08:14AM +0000,
 fih <frhak at hotmail.com> wrote 
 a message of 45 lines which said:

> it's bad to use Cnames because resolvers needs to do two lookups

Sometimes, the nameserver does it so the resolver needs only one
lookup.

Since it is a BIND mailing list, you can notice that BIND 8 and BIND 9
both perform this additional processing).

~ % dig +short @ns1.nic.fr A www.afnic.fr 
rigolo.nic.fr.
192.134.4.20
~ % dig +short @ns2.nic.fr A www.afnic.fr 
rigolo.nic.fr.
~ % dig +short @ns3.nic.fr A www.afnic.fr 
rigolo.nic.fr.
192.134.4.20

(ns1 = BIND 8, ns2 = nsd, ns3 = BIND 9)

> and also using Cnames and "virtual name based hosting" togeather
> would be illegal???

This is plainly wrong.