USNET

USNET is a TCP/IP protocol suite that supports Ethernet, ARCnet, SLIPP, PPP Gateways and more on 8-, 16-, or 32-bit processors. USNET is a versatile protocol suite designed to be powerful, compact and simple to use. From the start, this tool was designed to give you processor-independent implementation of TCP/IP. This product is fast because of its unique design for embedded systems (no free-ware ports). It gives you the best performance from your Intel target processor.
USNET is compact and requires less than 25 Kbytes of code space for the complete TCP/IP protocol, including support routines, on a 16-bit processor. We can easily fit if you are adding network support to your product or using multiple protocols.
USNET is ANSI C compatible and features support for more than 25 C compilers. Designed for reentrancy to ensure proper operation with real-time operating systems, USNET can be used standalone or adapted to virtually any RTOS environment, commercial or custom.
A full suite of clients/servers, protocols, link layers, adapter, drivers as well as drive interfaces for Novell and Microsoft makes USNET the comprehensive solution for your needs.
Code and data space are usually at a premium in a real-time embedded system. USNET may be configured to use only those clients/servers, protocols, link layers, and drivers needed by your application. USNET provides your choice of device drivers and link layers, including the ones listed below, as well as network link layers for Ethernet, serial (SLIP), PPP and ARCnet.
The complete TCP/IP protocol including all needed routines takes about 25K of code space on most target processors. The fixed RAM requirement is typically less than 29K. Each active connection requires buffer space.
Source is included and highly structured for versatility and user customization.