MTU settings restriction

Hi,
I can't seem to find mention of this anywhere, but I am having a problem with the manual settings in Network>Ethernet>Advanced>Hardware>MTU
As part of a temporary fix for a mess up with my ISP, I had MTU set at 900 for my MacBookPro.
This was fine on Snow Leopard, it as running fine yesterday.
I upgraded last night and now there seems to be a range limit from (1280-1500).
Is there a way to force the ethernet device to 900 MTU?
Any help would be greatly appreciated.
J

Ok after a bit more research this seems to be an ipv6 minimum requirement.
Seeming as the entire planet is still using ipv4 by default, is there a way to either disable ipv6 to allow this lower MTU or some other workaround?

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