There are many modules, not included in /lib/iptables See https://bugs.launchpad.net/ubuntu/+source/iptables/+bug/141436 -- iptables connlimit/iplimit not working https://bugs.launchpad.net/bugs/60439 You received this bug notification because you are a member of Kernel Bugs, which is a bug contact for linux-source-2.6.15 in ubuntu.