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Thu, 22 Aug 1996 13:54:09 EDT |
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On Thu, 22 Aug 1996 10:27:43 CDT Chris Barnes said:
>I have a user that is complaining because LSMPT won't accept his node
>name. It's in the form: blah_blah.node.domain
>
>Is the "_" an illegal character? If so, does anyone have the RFC
>reference I can give him (he'll want proof).
Here are the relevant sections of RFC's describing host names:
RFC 952
ASSUMPTIONS
1. A "name" (Net, Host, Gateway, or Domain name) is a text string up
to 24 characters drawn from the alphabet (A-Z), digits (0-9), minus
sign (-), and period (.). Note that periods are only allowed when
they serve to delimit components of "domain style names". (See
RFC-921, "Domain Name System Implementation Schedule", for
background). No blank or space characters are permitted as part of a
name. No distinction is made between upper and lower case. The first
character must be an alpha character. The last character must not be
a minus sign or period. A host which serves as a GATEWAY should have
"-GATEWAY" or "-GW" as part of its name. Hosts which do not serve as
Internet gateways should not use "-GATEWAY" and "-GW" as part of
their names. A host which is a TAC should have "-TAC" as the last
part of its host name, if it is a DoD host. Single character names
or nicknames are not allowed.
RFC 1123
2.1 Host Names and Numbers
The syntax of a legal Internet host name was specified in RFC-952
{DNS:4}. One aspect of host name syntax is hereby changed: the
restriction on the first character is relaxed to allow either a
letter or a digit. Host software MUST support this more liberal
syntax.
Host software MUST handle host names of up to 63 characters and
SHOULD handle host names of up to 255 characters.
In short, "_" is an invalid character in a host name.
Regards,
John Hammond
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