I have managed to break my system by installing xtables-addons-1.37. Now ipset does not work. "Kernel error received: Invalid argument" I built the addon from source on my centos 6.9 system as per instructions for centos 6. It looks to me that xtables-addons has built and installed a ipset-4 extension due to my kernel: 2.6.32-754.6.3.el6.x86_64 I already had ipset v6.11 installed and now both do not work. The README indicated that I need a kernel > 2.6.35 which I presume is the problem. This now has become a major problem for me as I rely on ipset. Anyone suggest what I might do to fix this problem? Thanks, /Geo