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+there was a patch for fwtk with ip_filter 3.1.5 from James B. Croall
+(thanx for his work) which I put onto fwtk 2.0beta.
+Now, if you decide to do transparent proxying with ip-filter you
+have to put -DUSE_IP_FILTER to COPTS in Makefile.config.
+With Solaris 2.x you have to correctly replace the path to your
+ip_filter sources. (lib/hnam.c needs ip_nat.h)
+I also patched plug-gw to be configured to accept not only one
+destination with the parameter "-all-destinations" in netperm-table.
+Perhaps this is a security hole...
+The patched fwtk worked fine for me with linux (kernel 2.0.28 and ipfadm 2.1)
+and Solaris 2.5 (ip_filter 3.1.5).
+If you try to enhance the transparent proxy features for other
+architectures, see lib/hnam.c (getdsthost).
+Michael Kutzner, Michael.Kutzner@paderlinx.de