[Dnsmasq-discuss] Adding DNS ALG support to dnsmasq

[Bill]

I was wondering if anyone has looked at or is is the process of adding DNS ALG 
support, or something similar, to dnsmasq?

https://tools.ietf.org/html/rfc2694

What I would like to do to have the ability to query a DNS server located 
behind a NAT, and have it return the IP of the NAT, and setup connection 
tracking in the NAT to pass traffic thru to the host behind the NAT.  The 
effect of this is to have a reversible NAT, ie one that provides access to 
hosts behind the NAT, not by their IP, but by their hostname.

(There are other things in DNS ALG, but I am really interesting only in the 
reversible NAT aspect.)

Implementing this seems to need the DNS server (dnsmasq in this case), to 
configure the NAT using the 'expect' feature of connection tracking.  This 
would permit the following packets to traverse the NAT to the host, provided 
of course they meet the expectation (source, protocol, etc).

I'd like to know of anyone has looked at this, is implementing it, or knows of 
any implementations.  I have looked into it but have only seen enterprise 
implementations (Cisco & Juniper), but nothing open-source.

/bill