TCP/IP stack question

[Derick Hammond]

Hello All:

This could be a stupid question, so please bear with me.

I have tried grepping the rtems-4.6.0pre3 source tree for the definition of 
MSIZE and MCLBYTES, and have come up empty, lots of references though.

Where are these values defined?  I know they should be 128 and 1024/2048 
respectively, according to TCP/IP Illustrated, Vol 2.

I am interested to find out as I suspect that this may be why I am getting 
a "Can't get network cluster memory' error.

Thanks in advance.

Regards,
Derick Hammond