I am running sl6.3 (i.e. kernel 2.6.32-279). I upgraded the kernel using elrepo to kernel 4.1.4. I downloaded iptables-20140916.tar.bz2 i.e. Sep 16, 2014 snapshot in order to test new functionality of skb-priority added in ipset 6.22. Prior to this my iptables version was 1.4.7 I installed ipset .6.25 and create an ipset named test (ipset -N test hash:ip skbinfo) Then I Installed above mentioned Sep 16, 2014 iptables snapshot now it shows my version as 1.4.21 when I execute follwing command iptables -t mangle -A POSTROUTING -o eth1 -j SET --map-set test src --map-prio it gives error iptables v1.4.21: unknown option "--map-set" Try `iptables -h' or 'iptables --help' for more information. prior to installing iptables, i execute follwing commands to stop iptables and remove iptables modules, so that old modules should not confilct. service iptables stop rmmod iptables_mangle rmmod iptables_filter rmmod iptables_nat rmmod ip_tables Please help. -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html