Configuring IPv6 is this easy if your ISP is IPv6-ready on CentOS 5 and 7:
- /etc/sysconfig/network-scripts/ifcfg-my_interface file, note the settings that start with “IPV6”
- DNS2=2001:4860:4860::8888 – Google Public IPv6 nameserver
- IPV6INIT=yes – This is needed when configuring IPv6 on the interface
- IPV6ADDR=my_ipv6-address – Specifies a primary static IPv6 address
- IPV6_DEFAULTGW=my_ipv6-address – Adds a default route through the interface specified
You don’t need new IPv6 switches, since switching is done at Layer 2. I’m using the old bargain web-managed HP Procurve J9028A. Image may be NSFW.
Clik here to view.
(When people say IPv6-capable, that means the management features can be assigned IPv6 addresses, or that it can do Layer 3 routing functions with IPv6 addresses.)
To test:
ping6 ipv6.google.com# ping6 ipv6.google.com PING ipv6.google.com(sfo07s17-in-x0e.1e100.net (2607:f8b0:4005:80a::200e)) 56 data bytes 64 bytes from sfo07s17-in-x0e.1e100.net (2607:f8b0:4005:80a::200e): icmp_seq=1 ttl=56 time=1.39 ms
traceroute -6 ipv6.google.com# traceroute -6 ipv6.google.com traceroute to ipv6.google.com (2607:f8b0:4005:80a::200e), 30 hops max, 80 byte packets 1 gateway (xxx:xx:x:xxx::1) 3.959 ms 3.978 ms 4.005 ms 2 10ge7-3.core3.fmt2.he.net (2001:470:0:274::1) 7.859 ms 7.933 ms 11.998 ms 3 10ge10-5.core1.pao1.he.net (2001:470:0:263::2) 11.296 ms 0.785 ms 11.311 ms 4 google-as15169.10gigabitethernet8-2.core1.pao1.he.net (2001:470:0:244::2) 0.944 ms 0.946 ms 0.980 ms 5 2001:4860:0:1004::1 (2001:4860:0:1004::1) 1.471 ms 2001:4860:0:1006::1 (2001:4860:0:1006::1) 1.478 ms 2001:4860:0:1004::1 (2001:4860:0:1004::1) 1.577 ms 6 2001:4860:0:1::1f71 (2001:4860:0:1::1f71) 1.328 ms 1.266 ms 1.221 ms 7 sfo07s17-in-x0e.1e100.net (2607:f8b0:4005:80a::200e) 1.150 ms 1.197 ms 1.210 ms
Tips:
- on CentOS 7, leaving network manager enabled was more successful than attempting to disable it
- the files are in network-scripts/ are space-sensitive, so don’t use spaces
- if you’re a Perl programmer, for best results use perl 5.14 or newer and IO::Socket::IP instead of IO::Socket::INET.
rootusers.com: Configure IPv6 Addresses And Basic Troubleshooting In Linux
google.com: Google Public DNS IP addresses
centos.org: Are you using Network-Manager in no-GUI CentOS 7 Server?
