private address block & DNS

Bill Manning bmanning at ISI.EDU
Tue May 30 18:56:50 UTC 2000


% 
% I was wondering how to handle 192.168 address with DNS.  The way things are
% setup here, we have many hosts running behind a firewall with the 192.168
% address scheme (and only a limited number of real IPs).  I would like to be
% able to have them listed in DNS so that they are accessable via their
% hostname.domain.com ( I was hoping to have them dynamically updated via dhcp
% server).  I am under the impression I simply can't go out and make a
% 10.168.192.in-addr.arpa zone or have A records pointing to a 192.169 address
% on a server which answers  inet queries for our domain.com, or is this okay
% because this is private address space and wouldn't receive queries from any
% machines besides the one's inside our firewall?...  I also thought about
% just setting up an internal (behind-fw) name server authoritative for a dhcp
% (dhcp.domain.com) subdomain, and have that do dynamic updates for the
% 192.168 clients (ie new client -> newclient.dhcp.domain.com), and use that
% as the primary nameserver for all the clients as well.   However this seems
% like it would still run into the problem of listing a private address to the
% world (dhcp.domain.com would resolve to 192.168.x.x if queried by an inet
% host via ns1.domain.com)..  maybe this doesn't make sense and there's a much
% easier way to go about it, but I havent found it yet..
% 
% Thanks for any help,
% 
% E.


Note in passing that there is authoritative service for the RFC1918
space in the public Internet to help folks plug holes in their firewalls.
Any queries that leak into the Internet will be resolved.

-- 
--bill



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