root@argo:/usr/local/ftester-1.0# ./ftestd -i eth0 Can't locate Net/RawIP.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.8.4 /usr/local/share/perl/5.8.4 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.8 /usr/share/perl/5.8 /usr/local/lib/site_perl .) at ./ftestd line 12. BEGIN failed--compilation aborted at ./ftestd line 12. root@argo:/usr/local/ftester-1.0# it's ftestd's fault or mine ??? I have debian sarge 3.1 2.6 stable and i get this when i launch ftest .I don't uderstand if it's my NICs problem or ftstd ! thanks ! P.S. I had a better read of your howto and run : #perl -MCPAN -e "install Net::RawIP" At the end of all questions i got this: /usr/lib/perl/5.8/CORE/reentr.h:775: error: storage size of `_srandom_struct' isn't known make: *** [RawIP.o] Error 1 /usr/bin/make -- NOT OK Running make test Can't test without successful make Running make install make had returned bad status, install seems impossible