Re: [DNSOP] Another look - draft-ietf-dnsop-attrleaf-05.txt

[Paul Vixie]

you do not need to document what won't work. underscored names don't 
match the syntax for host names. that's deliberate. that's why they were 
created. most dns servers will allow you to associate A or AAAA rrsets 
with underscored names, though some might warn you about it when parsing 
the zone file. some getaddrinfo() or gethostbyname() libraries will look 
up A or AAAA rrsets for these names, but many will not.

see RFC 952.
_______________________________________________
DNSOP mailing list
DNSOP@ietf.org
https://www.ietf.org/mailman/listinfo/dnsop