How to set MTU lower than 1280 with Lion

I am trying to set my MTU to 900 in order to play video games on my computer (this has been a known fix for many who have university network) but lion made it so you can't set your MTU to lower than 1280, or at least not easily.
If you don't know what i'm talking about, under network in system preferences, if you click on ethernet (or wifi) and go to the hardware tab, change it to manual, u will see mtu on the bottom with a (1280-1500).
Thanks

Thanks for the reply,
We need to set MTU to below 1280, but its not allow to set below 1280. Any other way will be helpful for us.
Regards,
Ashish

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How to set MTU lower than 1280 with Lion

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