You have to download / rebuild your userspace tools. If you checked out the CVS root, it is in the userspace directory. Not only do you need a kernel module, but you also need the userspace extensions to match with what is on the kernel. Steps: Build Kernel w/POM <same old> Install Kernel <same old> Build iptables (userspace) # KERNEL_DIR=<justbuiltkernelsourcedir> make; make install If the build gets b0rked due to some incompatibility between kernel/userspace extensions, rebuild the kernel without the offending extension. Reboot! Enjoy!