This is the source distribution for "Internetworking with TCP/IP, volume III," by Douglas E. Comer and David L. Stevens (Prentice Hall 1993). This code is for the BSD socket version. Note that some versions of UNIX do not define "u_short" in the include file . In the interests of compatibility with the published sources, a portability fix for that has not been included. If you have problems because of "u_short" being undefined, try adding the following line either in the affected files, or one of the include files they include: typedef unsigned short u_short; Bug reports may be directed via e-mail to "dls@cc.purdue.edu" or "comer@cs.purdue.edu". Thank you for your interest in the book! +-DLS David L Stevens, 9/15/92