Contributed by grey on from the helping out dept.
I am trying to move about ~20 GRE tunnels from a cisco to an OpenBSD 3.5 box. The problem is that most of the endpoints (also cisco) run an old version of IOS which requires the MTU to be 1514, while the MTU on the greN interfaces is set by default to 1450. There seems that there is no way to set / change the MTU on OpenBSD greN iterfaces to another value.
Any advice on how to deal with this will be greately appreciated.
A bit of googling turns up some people reporting similar troubles when trying to accomplish a similar task. Do any of our readers have some more concrete answers for george?
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