What MK to use for FireWall (filter LAN traffic)?

Question

Iron

What microcontroller can be used?
*clock frequency 1..4GHz (in terms of Pentium) so that you can programmatically parse ethernet frames.
* programmable paws to get network wires there.
j1800 boards 4.5 tr. - a little expensive and you have to write work with PCI, etc. - so I want a microcontroller after all. It is desirable that the power consumption is not very large, but these are already Wishlist ...

Answer 1

If 4.5 thousand rubles is expensive and you need a microcontroller, then most likely your task has no solution.