Access to ethernet buffer with C

Hello!
How can I access the ethernet buffer on my
DS80C400 with Keil C?

I tried:

unsigned char far * receiveBuffer = 0xFFE000;
for(i = 0; i < 256; i++)
    printf("%2bx", *(receiveBuffer + i));

But this code don´t access the right memory location.
The setting of IDM1 and IDM0 in MCON is 10 -> 8KB
buffer = FFE000-FFFFFF.
Is there something wrong in my Keil settings?

If I change IDM1/IDM0 to 00 I can access the
buffer with this pointer:

unsigned char far * receiveBuffer = 0x01E000;
The one in the address is correct!

But the library UDP functions (in my case sendto and
recvfrom) don´t work.
Is that the normal behavior?


Configuration:
TINIM400
Keil 7.07 with LX, AX enabled


Any hints?

TIA
steph
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