RFC 1323 described several options for increasing the performance of
TCP, one of these
is the TCP WIndow Size Scaling option, where the window size can scale
to 4 MB.

I have been using the VxWorks 5.5 software. The documentation lists the
maximum scaled TCP window size as 256 KB.

In VxWorks 6.x the networking stack software was upgraded. Just
wondering if anyone knows whether the supported maximum scaled TCP
Window Size is now bigger than 256KB?

Thanks for your help.