[AG-TECH] Using VPN as a Multicast Bridge

Jay Beavers jbeavers at microsoft.com
Thu Mar 14 00:48:24 CST 2002

FYI, I've validated basic multicast connectivity with stock vic, open mash, and our DISC conferencing software over VPN.
To optimize your experience, you can set the PPTP parameters on the client to 'no encryption' which turns the VPN connection into a pure tunnel without the encryption overhead.  I've enabled unencrypted sessions on the server.
-  jcb

	-----Original Message----- 
	From: Jay Beavers 
	Sent: Wed 3/13/2002 6:54 PM 
	To: ag-tech at mcs.anl.gov 
	Cc: Todd Needham 
	Subject: [AG-TECH] Using VPN as a Multicast Bridge

	For anyone who wants to try out the feasibility of VPN as a unicast to
	multicast bridge, I've set up a test server on our Internet2 connection.
	From a Windows 2000 or Windows XP box, configure a VPN connection as:
	Server: vpn-internet2.learningwebservices.com
	User: VPN
	Pass: VPN
	and you will receive a valid Internet2 address that has multicast
	connectivity, provided you are not behind a firewall that filters out
	PPTP and L2TP traffic.
	This is only meant as a feasibility trial and isn't a service Microsoft
	Research is intending to offer to the AG community.  We have only
	limited Internet2 connectivity and would rapidly run out of bandwidth
	attempting to be a unicast bridge service provider.
	If you do experiment, please let me know your results.  If this works
	effectively for AG scenarios, I'll write up the results and how to set
	up an out of the box Windows 2000 Server or Windows.NET server to
	provide this unicast to multicast bridge functionality.
	 - jcb
	Use standard Internet2 security precautions, as this virtual connection
	is only lightly firewalled.  Limited to 5 simultaneous users on our end.
	Trial may end at any time.  Service not guaranteed.  You may be
	disconnected at any time.  Not for children under age 3.  May contain
	removable parts.  Do not taunt happy-fun ball.

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