hello, i met a problem in configuratiion of ipv6 gw in my box i install centos 6.3 (64 bit) on my boxs, which have four netcard. i use a straight-through cable to connect centosv0:netcard-2 and centosv1:netcard2 the topology is this: client c(windows xp) <-->centosv0:netcard-3 <--> centosv0:netcard-2 <---> centosv1:netcard-2 <---->centosv1:netcard-2 <---> client d (backtrack r2 32) 1:2:3:4::2/64 1:2:3:4::1/64 1:2:3::4/64 1:2:3::5/64 1:2:3:5::1/64 1:2:3:5::2/64 what i want to do is set default gw on centosv0 to centosv1 i configure /etc/sysconfig/network-scripts/ifconfig-eth2 (centosv0) as this DEVICE="eth2" BOOTPROTO=static HWADDR="60:A4:4C:23:2F:6F" NM_CONTROLLED="yes" ONBOOT="yes" TYPE="Ethernet" #UUID="0ddcf499-878f-4ac7-9d1a-c27f85d2bccf" IPV6INIT=yes IPV6ADDR=1:2:3::4 IPV6_DEFAULTGW=1:2:3::5 and i also configure /etc/sysconfig/network to this: NETWORKING=yes HOSTNAME=centosv0 NETWORKING_IPV6=yes IPV6_AUTOCONF=no but i met an error: Bringing up interface eth2: WARN : [ipv6_add_route] Unknown error i do not know how why,and can some one gives me some suggestion? thanks a lot.