Adding an IPv6 address to an existing IPv4 interface

Adding an IPv6 address to an existing IPv4 interface

Add the following to /etc/sysconfig/network  : 

NETWORKING_IPV6=yes                     # Enables global IPv6 initialization
IPV6_DEFAULTGW=(your ipv6 gateway in Hex) # Default gateway 
IPV6_AUTOCONF=no
IPV6_AUTOTUNNEL=no

Then add the following to /etc/sysconfig/network-scripts/ifcfg-eth0 (or whatever interface)

IPV6INIT=yes
IPV6ADDR=(your assigned IPv6 address)
IPV6ADDR_SECONDARIES=””
IPV6_DEFAULTGW=(IPv6 default gateway)

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