It would not be an Ethernet Frame.  It would be a PPP or HDLC or FR frame.
The router would strip off the Ethernet frame and router it across the
Serial Link using a new frame type based on the encapsulation method.  There
are no MAC addresses.

--
Kevin L. Kultgen

""Martinez, Carlos"" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> hello all,
>
> I had somebody ask me what the source mac address would be on a frame sent
> across a serial link connected by to two routers,
>  for example: Host A sends a packet to Host B, which is on the other side
of
> the wan link. what would Host B see and what where would he send his reply
> to.(the local router or Host A or what)????
>
> thanks in advance
>
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