programming on ethernet level

[Telematica Grupo X - R.Vargas - E.Mesa]

 hi there!
 can anybody here tell me how can i send and receive ethernet packets
 directly on layer 2 under linux? 
 i need that for the following project: one linux machine, two ethernet
 nics. we want to some kind of bridging function between the two nics with
 the additional features of controlling bandwidht, delay, error-rate and so
 on. this should make up something like a link-simulator: you could for
 example simulate the behaviour of a satelite-link.
 i'm afraid, the kernel bridging option wouldn't help very much, because i
 cannot manipulate the buffers (or at least i don't know how to), so i
 thought about implementig a program which does the bridging by itself.
 are there any calls to get the ethernet-frames or do i have to hack around
 in the kernel?
 any other suggsetions?
 help would be greatly appreciated!
 


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