I stand corrected. 

(And exposed as a dodderer. Undoubtedly I'm remembering an older RFC; a
vague association makes me think somewhere in the 1100s, but I won't be
arsed to go find it just now. Come to think of it, I'm pretty sure the
same RFC prohibited a leading digit in a token -- i.e. 3com.com -- and I
know that's been relaxed.)

        Cheers,
                Ole

 On Thu, 2006-07-27 at 10:10 -0400, der Mouse wrote:
> >> Hi, that problem has been solved!!!!  My machine have the name
> >> rt_dev.example.com and i change to rtdev.example.com , and it works
> >> fine, the problem was the underscore.
> > That's not surprising... an underscore is not a valid character in a
> > hostname, if I recall the RFC correctly.
> 
> This is true in only some contexts.  Email, for example - SMTP does not
> permit underscores in domain names appearing in SMTP commands and
> responses.  In most other contexts, underscores and miscellaneous other
> characters are permitted but discouraged.  See, for example, the first
> paragraph of page 5 of RFC 2317.
> 
> > I'm surprised your DNS server allowed it.
> 
> All 256 octets are legal in DNS labels; any (supposedly)
> general-purpose DNS server that doesn't support them is broken.
> 
> /~\ The ASCII                         der Mouse
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-- 
/Ole Craig
Security Engineer

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