Hello,

Is it documented anywhere that we're now allowed to have 2 nameserver
hosts, e.g. ns1.domain1.com and ns1.domain2.com point to the same IP
address, e.g. 10.0.0.1 ? (obviously, that one won't be a good one to
use for the web) I recall at one time, only a 1 to 1 mapping was
allowed?

If we already have a nameserver, say at ns1.domain1.com, do we need to
do anything special in the configuration of the physical nameserver, if
we simply create a new nameserver record of ns1.domain2.com and point
it at that IP address, e.g. for vanity? (e.g. if one has DNS hosting at
UltraDNS, with nameservers:

udns1.ultradns.net 204.69.234.1
udns2.ultradns.net 204.74.101.1

and we simply create a 'vanity' privately-branded nameserver instead
of:

ns1.company.com   204.69.234.1
ns2.company.com 204.74.101.1

would that "work", without having to notify UltraDNS (i.e. is the
hostname used at all, or just purely the IP address?; for webhosting,
the hostname is used, e.g. name-based hosts in http 1.1)

Sincerely,

George Kirikos
http://www.kirikos.com/

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