Ever since I removed IPX and AppleTalk as modules (my default installation had these two protocols compiled as modules) as long time ago, I get the following errors at startup: modprobe: can't locate module net-pf-4 modprobe: can't locate module net-pf-5 I did not bother why these are happening then. Now I do and have it solved. All you have to do is to manually add the following lines in /etc/conf.modules: alias net-pf-4 off alias net-pf-5 off and that's it!!!! If you have to use IPX or AppleTalk, you need to comment these out. Why this is not done automatically, I dunno. I found the answer in /usr/src/linux/Documentation/modules.txt If you can't find it, try: cd /usr/src find . -type f | xargs grep -e 'net-pf-4'