TCP SYN attacks - a simple solution

I'm going to implement this, using boring old md5, and give it a try,
but I was wondering if there are any thoughts about this as a solution?
Any obvious holes I missed.

Rex di Bona.

Using md5, it seems to be working just fine (when it works and doesn't
crash :)).

Code for starters can be found at,
I believe.

One thing: You must STORE the MSS as part of the iss, or a table of common
MSS values. Initial data and window args you seem to be able to ditch without