IPv6 Tunnel CentOS

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CentOS

/etc/sysconfig/network

NETWORKING_IPV6=yes
IPV6_DEFAULTDEV="tun6to4"

/etc/sysconfig/network-scripts/ifcfg-eth0

IPV6INIT="yes"
IPV6TO4INIT="yes"
IPV6TO4_RELAY="192.88.99.1"

Restart your networking (/etc/init.d/network restart)
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centos

/etc/sysconfig/network

NETWORKING_IPV6="yes"
IPV6_DEFAULTDEV="he-ipv6"


/etc/sysconfig/network-scripts/ifcfg-he
DEVICE=he-ipv6
TYPE=sit
BOOTPROTO=none
ONBOOT=yes                         # set to "no" if you prefer to start the tunnel manually
IPV6INIT=yes
IPV6TUNNELIPV4=66.220.18.42        # Server IPv4 address
IPV6ADDR="2001:470:f0be::1/48"      # Client IPv6 address
IPV6ADDR_SECONDARIES="2001:470:f0be::2/48"