Aredridel wrote:
Hostnames cannot start with a dash nor contain underscores. However,
domain labels -can-, at least in practice, and are often used for
special-purpose tags:
_kerberos.domain IN TXT "REALM"
for locating the kerberos realm for a domain
_service._proto.domain IN SRV x x x
for locating services on a domain -- a concrete example for those not
familiar:
_http._tcp.domain.org IN SRV 10 80 web-server-machine.domain.org
Since we are using TXT records for compatability with older DNS
implementations (versus getting our own RR type) perhaps we should
simply think of not using _ for the same reason. When we get our own RR
type (or change our lookup mechanism in some similar way) the domain
names can change as well to be more consistent with newer conventions.
I only say this because we are effectively aiming at older DNS servers
for the sake of adoptability, and from the sound of things we are
planning to ask for better facilities once we have widespread adoption,
at which point we will be in a position to ask for our own RR (or some
other mechanism to avoid using the TXT record)
--Jonathan Steinert
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