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Need to know MAC Address??

Need to know MAC Address??

Need to know MAC Address??

Hi guys, I´m new here, this is my first question
I tried to find a similar question here but I couldn´t... (maybe the way or words that I used, don´t know)
Well, the question is:

I´m using Microchip microcontroller PIC18F97J60 in my Project, using Microchip TCP/IP Stack. (their implementation of the stack has a lack of some things, but the basic works fine)
I have a TCP cliente socket. I know the IP that i need to connect, but don´t the MAC Address. If I connect at the IP, I can see in the wireshark the MAC destination as FF:FF:FF:FF:FF:FF (broadcast).
If I connect to the same IP using docklight or a similar program I see the correct destination MAC Address. It seems to me that Microchip stack doesn´t handle this at the TCP Sync process before connection, right?
I´m afraid of not knowing MAC could lead me to weird situations...
What is your advice to solve this??

I would like to figure out how the TCP stack (from Windows for instance) knows the MAC in the Sync processes during the connection

Tks in advance

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