Are underscores no longer supported in Bind 9.4?

Edward Lewis Ed.Lewis at
Thu Mar 1 07:27:19 UTC 2007

At 16:37 +1100 3/1/07, Mark Andrews wrote:

>	Similarly for SRV, using underscore moves the records out of
>	the hostname space.

What is often misunderstood is the difference between a domain name 
and a (DNS) host name.  Host names are constrained by rules in RFC 
1123 to basically letters, digits, etc. (you can read the spec for 
details).  All DNS host names are domain names but not vice versa.

Places where a host is needed and not a domain name is in the RDATA 
of an NS record.  Conversly the owner of any record is a domain name 
and ordinarily not just a host name.  A and AAAA records are places 
where the restriction is understandable as only hosts have IP (4/6) 
Edward Lewis                                                +1-571-434-5468

"Two years ago you said we had 5-7 years, now you are saying 3-5.  What I
need from you is a consistent story..."

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