The 11.x does have DECnet routing for sure. Even the 9.x had DECnet routing, because the DECbrouter90's came with IOS 9.x and then both DECnet and OSI routing was included. But I'm not sure when GRE was introduced. I have the 9.x manuals for the DECbrouter90's but I'm not sure if DECnet can be tunneled using the tunneling which was in that version. In the manuals there aren't anything mentioned about that. I have also the 11.x IOS manual. I have to check there if GRE is mentioned with DECnet. But if someone knows the answer, please tell. Regards, Kari On 28.4.2012 21:38, Brian Hechinger wrote: I would be extremely surprised to find that both GRE and DECnet weren't to be found in 11 let alone 12. It's more likely to be a feature set issue. Cisco has a feature navigator tool on their website. That can be used to figure it out. -brian On Apr 28, 2012, at 14:19, Dave McGuire<mcguire at neurotica.com> wrote: This doesn't require much horsepower; a 2500 should be more than enough. I don't recall when GRE was introduced in IOS, but it's nowhere near recent. We'll just have to figure out which 2500 IOS release has both GRE and DECnet support. -Dave On 04/28/2012 01:23 PM, Kari Uusim ki wrote: I'm interested in that option as well. I have a couple of Cisco 2500's. Which IOS version is needed? Regards, Kari On 28.4.2012 20:14, Brian Hechinger wrote: Dave McGuire and I have a GRE tunnel with decnet routed over it on our cisco routers. It works! It's easy, too! If you have a cisco router and want to play let me know. If you don't have the right version of IOS I can get it for you. -brian . -- Dave McGuire, AK4HZ New Kensington, PA .