TechNote: 0006
Date    : 06/14/96
Cat/Sub : WANPIPE/LINUX
Title   : Probolem with IP Alias Patch for Linux 1.2.x
Contact : Gene Kozin, 74604,152@compuserve.com

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Symptoms:
  After applying a patch alias-patch-1.2.1-v1 WANPIPE fails to initialize with
  the following error:

      flipcfg error 1: Operation not supported on transport endpoint

Diagnosis:
  This patch adds some conditionally-compiled code to Linux kernel that gets
  compiled when HAVE_IP_ALIAS is #define'd.  Unfortunately, instead of adding
  default configuration option to config.h file (or autoconf.h) it blatantly
  forces HAVE_IP_ALIAS definition by modifying compiler options in master
  Makefile.

  Since WANPIPE code absolutely rightfully relys on system configuration
  being defined in config.h (and autoconf.h), the kernel and WANPIPE modules
  end up being compiled with different sets of #define's.

Treatment:
  To correct the problem do the following:

    1) add a line '#define HAVE_IP_ALIAS' (without quotes) to config.h file
       located in /usr/include/linux directory following the line
       '#define _LINUX_CONFIG_H'

    2) rebuild WANPIPE by running /usr/lib/wanpipe/build script.

    3) restart WANPIPE.

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