No, sysctl -a | grep forward: net.ipv4.conf.ra0.mc_forwarding = 0 net.ipv4.conf.ra0.forwarding = 1 net.ipv4.conf.eth0.mc_forwarding = 0 net.ipv4.conf.eth0.forwarding = 1 net.ipv4.conf.lo.mc_forwarding = 0 net.ipv4.conf.lo.forwarding = 1 net.ipv4.conf.default.mc_forwarding = 0 net.ipv4.conf.default.forwarding = 1 net.ipv4.conf.all.mc_forwarding = 0 net.ipv4.conf.all.forwarding = 1 net.ipv4.ip_forward = 1 The -s or -o options don't work either, maybe it's amd64? I am on gentoo 2.6.19-r5.