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IPv4 ip address is almost done. All IPv4 are assigned to RIRs by IANA ( http://www.nro.net/news/ipv4-free-pool-depleted ) so we must learn and configure IPv6.
Here is how to do that in Red Hat Enterprise Linux:
Files to configure:
/etc/sysconfig/network
/etc/sysconfig/network-scripts/ifcfg-eth0
And here is the contents of that file
First /etc/sysconfig/network file should contain
NETWORKING_IPV6=yes
then /etc/sysconfig/network-scripts/ifcfg-eth0 file should be edited:
DEVICE=eth0
BOOTPROTO=static
ONBOOT=yes
HWADDR=00:30:48:33:bc:33
IPADDR=202.54.1.5
GATEWAY=202.54.1.3
NETMASK=255.255.255.248
IPV6INIT=yes
IPV6ADDR=2607:f0d0:1002:0011:0000:0000:0000:0002
IPV6_DEFAULTGW=2607:f0d0:1002:0011:0000:0000:0000:0001
As you can see above this machine has both IPv6 and IPv4 address which is very reasonable for at least 2 years on transition process. IPV6ADDR and IPV6_DEFAULTGW states. But be aware that there is no IPV6_NETMASK or something like that you have to use IPV6ADDR for that:
IPV6ADDR="3ffe:ffff:0:1::1/128"
More available sysconfig variables for IPv6 is at your RHEL installation at /usr/share/doc/initscripts* directory and /usr/share/doc/initscripts*/sysconfig.txt file
This blog was partly taken from http://www.cyberciti.biz/faq/rhel-redhat-fedora-centos-ipv6-network-configuration/
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