Contents • • • • • • • • • • • • • General [ ] Prerequisites [ ] This page assumes the reader is familiar with the TCP/IP protocol suite and IP communication in general. A Note on Terminology [ ] This module uses the normal TCP/IP terminology, where the terms indicate the following: TCP The TCP protocol as such, at the transport layer. Alien Head Pepakura Files Star here.

IP The IP protocol as such, at the internetworking layer. TCP/IP The complete internet protocol suite, encompassing many more protocols than just TCP or IP. Also, this module uses the TCP/IP notation of protocol layers, not the OSI model, unless stated otherwise: +--------------------+ Application Layer e.g.

Lwip+gprs+ppp over serial. Hi guys, I'm really sorry but after 10 days spent with lwip stack, it's time to ask help. I'm working with a custom board based on stm32f103 and on ublox Leon-G100. Hi Clive and other lwip users. I am looking for tools to investigate in PPP (over serial port) protocol handling, espacially the PAP and CHAP mechanism. As I read, there are several different CHAP standards (MD5 and a windows proprietary one as I understood Clive). Please read further explanations, what Im planning to do.

SMTP +--------------------+ Transport Layer e.g. TCP +--------------------+ Internetwork Layer e.g. IP +--------------------+ Link Layer e.g. SLIP or PPP +--------------------+ The Problem [ ] General [ ] Transmitting IP data over a serial (RS-232) line is haunted by several problems, among them: • lack of framing • lack of flow control • lack of session management Of which lack of framing is the most serious one.