To setup IPv6 on a RedHat based operating system, follow below steps:
vi /etc/sysconfig/network-scripts/ifcfg-ethX
IPV6INIT=yes IPV6ADDR=2a00:1630:1:13d::13d/56 IPV6_DEFAULTGW=2a00:1630:1:100::1
Restart the network, check if the default route is available:
ip -6 route
Should be something like:
default via 2a00:1630:1:100::1 dev eth2 metric 1 mtu 1500 advmss 1440 hoplimit 4294967295