Why is SCTP not much used/known

Question

I recently checked out the book \"UNIX Network Programming, Vol. 1\" by Richards Stevens and I found that there is a third transport layer standard besides TCP and UDP:

Answer 1

We have been deploying SCTP in several applications now, and encountered significant problem with SCTP support in various home routers. They simply don't handle SCTP correctly. I believe this is primarily a performance issue (the SCTP protocol specification require checksums for the whole packets to be recalculated and not just for headers).

Like many other promising protocols SCTP is sadly dead in the water until D-link and Netgear fixes their broken NAT boxes.