[AG-TECH] NAT and bridge traffic

[Nagykaldi, Zsolt F. (HSC)]

OpenVPN allows you to put your remote client computer "physically" and very securely on an ad-hoc local network. Therefore, as the most simple setup, you can run an OpenVPN server on the same machine that you use for the bridge server and handle remote clients as local network clients, allowing access to the bridge for a range of local IPs only (e.g. 10.10.x.x), in addition to your regular bridge access over the Internet. For intricate technical details of fine-tuning the bridge server, I would encourage you to contact Joe at stone004 at umn.edu.
 
 
Zsolt
 
 
---
 
Zsolt Nagykaldi, PhD
Assistant Professor of Research
Clinical IT Specialist
 
University of Oklahoma Health Sciences Center
Department of Family & Preventive Medicine
900 N.E. 10th Street
Oklahoma City, OK 73104
 
Phone: (405) 271-8000 ext.1-32208
Fax:     (405) 271-2784

________________________________

From: George Estes [mailto:gestes at ncsa.uiuc.edu]
Sent: Tue 9/11/2007 12:08 PM
To: Nagykaldi, Zsolt F. (HSC)
Cc: ag-tech at mcs.anl.gov
Subject: RE: [AG-TECH] NAT and bridge traffic


Zsolt,

  What's the basic setup for using OpenVPN with a bridge?

Thanks,
George

At 10:46 AM 9/11/2007 -0500, Nagykaldi, Zsolt F. \(HSC\) wrote:



	 
	It is generally a pain in the back to establish connections to bridge servers in a NAT -ed environment. Port forwarding is one of your options, however there are a number of issues: 1) A large number of ports may need to be forwarded depending on the bridge setup and how many bridges you want to access (security implications); 2) Some older Cisco firewalls without a decent GUI may give you a hard time to create the appropriate rules to do what you need.
	 
	My suggestion is to forget about ports and use OpenVPN on the bridge and the client machine to go through the NAT -ed network and everything in between your computer and the bridge. We have a significant experience with this and pretty good results. Your absolute expert (who came up with the combined bridge/Open VPN server solution) is Joe Stone (stone004 at umn.edu). I can also help, if needed.
	 
	Zsolt
	 
	 
	---
	 
	Zsolt Nagykaldi, PhD<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
	Assistant Professor of Research
	Clinical IT Specialist
	 
	University of <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />Oklahoma Health Sciences Center
	Department of Family & Preventive Medicine
	900 N.E. 10th Street
	Oklahoma City, OK 73104
	 
	Phone: (405) 271-8000 ext.1-32208
	Fax:     (405) 271-2784
	
	
________________________________

	From: owner-ag-tech at mcs.anl.gov on behalf of George Estes
	Sent: Tue 9/11/2007 9:00 AM
	To: ag-tech at mcs.anl.gov
	Subject: [AG-TECH] NAT and bridge traffic
	
	Hello,
	
	  Could someone with experience in this area  tell me the issues/problems with receiving traffic from a bridge server if I'm behind a NAT.  I've looked through the ag-tech mailing list and there's talk of problems but I can't find specifics.
	
	Thanks,
	George
	

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