[ale] NAT proxy?

[Dow Hurst]

I have a project I am working on for someone and have come up with this
scenario to figure out:

What are the techniques for having connections initiated *from* the
Internet passed thru a NAT based firewall and to a listening daemon on a
server behind the NAT based firewall?

I am interested in having specific IPs outside a firewall able to
request services such as X connections or SSH connections from any of a
set of servers that are behind a NAT/ipchains based firewall.  Is there
a way to do this?

Imagine a lab of PCs needing to connect to servers running chemistry
software.  The PCs are represented by a known range of dynamic IPs and
the servers are hidden behind a NAT/ipchains based firewall.  The
non-networked address range behind the NAT firewall is 192.168.100.0. 
Can I have a proxy of sorts on the firewall willing to forward
connections in a round robin fashion?  The first connection goes to
192.168.100.3, the second to 192.168.100.4, and so on.  Has anyone done
this or know of any way to do it?  I understand that I can forward
certain ports to a particular DMZ type server, but I want more
flexibility.  Thanks for the help,
Dow
   
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__________________________________________________________
Dow Hurst                   Office: 770-499-3428
Systems Support Specialist  Fax:    770-423-6744
1000 Chastain Rd.
Chemistry Department SC428  Email:dhurst at kennesaw.edu
Kennesaw State University         Dow.Hurst at mindspring.com
Kennesaw, GA 30144
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*Computational Chemistry is fun!*
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