On 19/03/12 21:56, Johnny Billquist wrote: On 2012-03-19 13.15, Dave McGuire wrote: Brian, I think the best way to approach it is to just try this: interface Tunnel1 no ip address decnet cost 10 bridge-group 1 Sometimes the simplest approach is best. =) Offhand I don't see why that wouldn't work. Another possibility might be to to just bridge everything across the tunnel, then use ACLs to filter on EtherType (DECnet Phase IV is 0x6003): access-list 200 permit 0x6003 ... interface Tunnel1 no ip address bridge-group 1 input-type-list 200 # or output-type-list?www Just a check here. When you do this, will the ethernet packets coming through retain their original MAC source addresses? Otherwise this will not work. Oh, and you probably need to pass through both 0x6003 and 0x6004. Johnny Sorry for being ignorant, what's GRE?