Actually, you can do it using just a single ethernet port on a router. Here are the config's that we used on our routers for Banyan Tunneling: End1 ===== int tunnel1 no ip address bandwidth 1000 vines metric 45 tunnel source ethernet0 tunnel destination 10.2.1.1 int e0 ip address 10.1.1.1 vines metric 2 End2 ==== int tunnel1 no ip address bandwidth 1000 vines metric 45 tunnel source ethernet0/0 tunnel dest 10.1.1.1 int e0/0 ip address 10.2.1.1 vines metric 2 ====== That's pretty much it. Now, if you have a lot of sites and you want to keep your tunnel config's pretty simple, I would recommend just setting up a router some where on your network and point all of your tunnels to that router., but this would really depend on your network and how it is configured. Does this help? Spencer **************************************************** Spencer Wood, Network Administrator Ohio Department Of Transportation 1320 Arthur E. Adams Drive Columbus, Ohio 43221 E-Mail: Spencer.Wood@dot.state.oh.us Phone: 614.644.5422/Fax: 815.361.0714 **************************************************** "Stillman, Kevin" <STILLMKT@sysadm.suny.edu> Sent by: owner-nanog@merit.edu 03/14/2001 03:09 PM To: "'nanog@merit.edu'" <nanog@merit.edu> cc: Subject: RE: DECNet over IP? Thank you all for your advise. Unfortunately I am working with a Bay/NortelNetwork environment. Nortel's implementation of GRE tunneling does not support DECNet Phase IV. The kludge of a solution that has been proposed to me by Nortel is transitioning the native DECNet phase IV communication to DECNet phase V, which works in OSI, then tunnel the OSI using GRE. I'm going to try it in a lab, but I have serious doubts about how well it will work. It is a scary proposition. If anyone has actually seen this work I love to hear from you. The solution that I need to create is one that will not require the DEC administrators on LANs using our WAN for DECNet interconnectivity to make any changes on their VAXes, printers... etc. That means Compaq or third party software on the VAX cannot be part of the solution. Basically it needs to be transparent to the LAN. If Cisco is capable of tunneling DECNet phase IV right out of the box, then I think I may have my solution. This would mean the router would run DECNet on the ethernet and run a GRE tunnel over the IP network on the sync port(s). Does this sound like the right idea? Thanks again! Kevin