[jboss-dev] Hostname problem when starting JB AS TRUNK

[Jonathan Halliday]

Jason T. Greene wrote:
> In reality there is nothing wrong with [underscores],
 > they just aren't allowed in DNS.

That was correct in ARPANET times, but it's been untrue for 
quite a while, even before internationalized domain names 
became widely supported. DNS itself (as in the RFCs) does 
not make such a restriction. Certain overly conservative 
client programs may.

http://www.faqs.org/rfcs/rfc2181.html section 11:

"Implementations of the DNS protocols must not place any 
restrictions on the labels that can be used."

or

http://www.faqs.org/rfcs/rfc3696.html section 2:

"Any characters, or combination of bits (as octets), are 
permitted in DNS names."


Jonathan.
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