On 04/28/2012 02:57 PM, Kari UusimC$ki wrote: 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. GRE doesn't need to specifically support DECnet; it should happily tunnel anything. All you need to do is set "decnet cost <n>" on your tunnel interface. -Dave GRE tunnels use the ethertype to indicate the protocol being encapsulated. In the case of DECnet routing on C the tunnel is treated as Ethernet between two routers. Unfortenly the RFC's are a mess, the "mobile world" showed up to help.. You can also use l2tpv3 and make a ethernet bridge like Johnny's. (but, use the router...) (Xconnect the two ethernet port you want to bridge between..) -P