ellozy@farber (Mohamed Ellozy) (09/19/90)
RFC 1033 (Domain Administator's Operations Guide) states
... only the following characters are recommended for use in
a host name (besides the dot separator):
"A-Z", "a-z", "0-9", dash and underscore
On the other hand, RFC 1034 seems to disallow (or rather discourage) the
use of the underscore (grammer given on page 11).
What are the true rules?
Thanks.
Mohamed