dns´s y undercores

Parece que en linux hay problemas en la resolucion de nombre con underscores.
Buscando en google:

• "Underscore in a hostname used to violate the DNS RFCs. The Proxy was just following the RFC. " De aqui.
• What type of names are supported in Windows 2000/2003 DNS?.

Y para acabar las pruebecillas hechas en linux (donde un GET o un telnet al puerto 80 falla):

$ telnet www._cesar_ortiz_.blogspot.com 80
www._cesar_ortiz_.blogspot.com: Unknown server error

$ telnet cesarob.blogspot.com 80
Trying 66.102.15.101...
Connected to blogspot.blogger.com (66.102.15.101).
Escape character is '^]'.


$ nslookup www._cesar_ortiz_.blogspot.com
Note: nslookup is deprecated and may be removed from future releases.
Consider using the `dig' or `host' programs instead. Run nslookup with
the `-sil[ent]' option to prevent this message from appearing.
Server: 192.168.200.252
Address: 192.168.200.252#53

Non-authoritative answer:
www._cesar_ortiz_.blogspot.com canonical name = blogspot.blogger.com.
Name: blogspot.blogger.com
Address: 66.102.15.101