I don't have a direct answer for your question, but I think the reference on the topic is "TCP/IP Illustrated, Volume 1+2". Volume 2 holds a lot of implementation details of the NetBSD? kernel TCP/IP stack. /moliate The corners of my eyes catch hasty, bloodless motion - a mouse? Well, certainly a peripheral of some kind. Neil Gaiman - Cold Colours

Have you read through RFC 1058? "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow