Re: Hostname problem when starting JB AS TRUNK

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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Jonathan Halliday wrote, On 10/11/2007 05:39 PM (EEST):
> 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.

Try to register one...

> 
> 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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Jonathan Halliday wrote:
> 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.

Yeah I was generalizing. BIND enforced it up to version 8.
V9 changed 
it, and will if check_names is explicitly enabled. Internic
won't let 
you register domains with it


-- 
Jason T. Greene
JBoss, a division of Red Hat
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