References

   [1]   Simpson, W., "The Point-to-Point Protocol", RFC 1331, May 1992.

   [2]   Postel, J., "Internet Protocol", RFC 791, USC/Information
         Sciences Institute, September 1981.

   [3]   Jacobson, V., "Compressing TCP/IP Headers", RFC 1144, January
         1990.

   [4]   Postel, J., "The TCP Maximum Segment Size Option and Related
         Topics", RFC 879, USC/Information Sciences Institute, November
         1983.

   [5]   Mogul, J., and S. Deering, "Path MTU Discovery", RFC 1191,
         November 1990.

   [6]   Reynolds, J., and J. Postel, "Assigned Numbers", RFC 1060,
         USC/Information Sciences Institute, March 1990.

   [7]   Perkins, D., and R. Hobby, "Point-to-Point Protocol (PPP)
         initial configuration options", RFC 1172, August 1990.