Looking for way to mark a zone no-xfer for a sub-domain .

[Bill Manning]

% > >     Georgi> Is using of rfc1918 addresses together with
% > >     Georgi> real IP in zone file prohibited?
% > > 
% > > No. Why would it be? RFC1918 addresses are valid IP addresses.
% > 
% > The obvious exception here is NS records for delegation hints. You really
% > should not use 1918 addresses to point to authoritative servers for a
% > zone, since external resolvers will never go to the right server.
% > 
% > MX records can also have problems in those cases where the MX list
% > includes 1918 addresses which are also valid mail systems on the remote
% > network. If a remote mailer tries sending to a 1918 address and delivery
% > to a local server succeeds (due to overlapping addresses), the mail may
% > not get delivered if the mailer decides there's a configuration error.
% 
% These are perfectly valid.  When used within the private internet.
% Obviously, it is their use on the public Internet that is a problem.
% 
% Go with split DNS, already.  Jim Reid's first answer was definitive.

	The kicker is that RFC 1918 addresses in email headers
	are -NOT- filtered by NATs/Firewalls and so escape into
	the Internet. They ought to be re-written at the ALG.

-- 
--bill