Allow underscores in DNS names

[Terry Lambert]

Barry Pederson wrote:
> > I thought proxy autodetect used wpad.domainname.com or looked up
> > http://domainname.com/wpad.dat ?  All the XP machines here do that.
> 
> The underscore in DNS names is showing up in things like RFC2872 (A DNS RR
> for specifying the location of services), and "DNS-based Service discovery"
> as found in Zeroconf/Rendezvous.

Excuse me, but that *particular* underscore is a namespace
escape, and is used *precisely* so that it does *NOT* ever
match a valid host name.

People who want the resource records for specific services
are supposed to use a service lookup API, rahter than a host
name lookup API.

Please read the working group documentation for Zeroconf.

Thanks,
-- Terry "A big fan of zeroconf and the death of DHCP" Lambert