Hi, In my system (uname -a -> Linux 2.6.18-348.1.1.el5.centos.plus #1 SMP Tue Jan 22 19:16:31 EST 2013 i686 athlon i386 GNU/Linux), I see a tun0 interface. Yours is ? There is a line in the makefile which you have to set to your system: #To compile for linux: make ARCH=linux #To compile for cygwin: make ARCH=cygwin ARCH=linux There is also a line #To compile for openbsd: make ARCH=openbsd in the makefile for 'minimal'. I don't recall right now, but if you follow the docs (yes, that all caps README file) you'll get through it. This is related to the particular network interface to use in every particular system, because some systems have /something/tun, others /otherthing/tap, and so on. The demo program is trying to patch into your system's networking stuff so lwIP can see it as a link-level device, and it can't do it if you don't tell it which system you have (otherwise the demo programmer would have to spend more time diving inside every possible system than doing the demo itself) Regards
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