====== Настройка IPv6 в CentOS ======

Включаем поддержку IPv6 в **/etc/sysconfig/network**

<code>
NETWORKING_IPV6=yes
</code>

Добавляем в конфигурационный файл сетевого интерфейса **/etc/sysconfig/network-scripts/ifcfg-eth0**

<code>
IPV6INIT=yes
IPV6ADDR="<IPv6-IP-Address>[/<prefix length>]"
IPV6ADDR_SECONDARIES="<Secondary-IPv6-IP-Address>"
IPV6_DEFAULTGW="<IPv6-IP-Gateway-Address>"
</code>

Пример конфигурационного файла

<code>
DEVICE=eth0
BOOTPROTO=static
ONBOOT=yes
IPADDR=192.168.1.1
NETMASK=255.255.255.0

IPV6INIT=yes
IPV6ADDR="2607:f0d0:1002:54::3/64"
IPV6ADDR_SECONDARIES="2607:f0d0:1002:54::4/64 2607:f0d0:1002:54::5/64"
IPV6_DEFAULTGW="2607:f0d0:1002:54::1"
</code>

Применяем изменения

<code>
# service network restart
</code>

или

<code>
# /etc/init.d/network reload)
</code>

Если система выдает ошибку

<code>
CRITICAL : [ipv6_test] Kernel is not compiled with IPv6 support
</code>

то в файле **/etc/modprobe.conf** комментируем следующие строки

<code>
#alias net-pf-10 off
#alias ipv6 off
</code>

также меняем значение с 1 на 0

<code>
options ipv6 disable=0
</code>

в итоге

<code>
#Uncomment the next two lines to disable IPv6 support at boot.
#alias net-pf-10 off
#alias ipv6 off
#Swap commented/uncommented lines below to disable IPv6 support at boot.
#options ipv6 disable=1
options ipv6 disable=0
</code>

Проверяем

<code>
# ping6 -c 4 ipv6.google.com 
PING ipv6.google.com(dfw06s03-in-x14.1e100.net) 56 data bytes
64 bytes from dfw06s03-in-x14.1e100.net: icmp_seq=1 ttl=52 time=66.4 ms
64 bytes from dfw06s03-in-x14.1e100.net: icmp_seq=2 ttl=52 time=65.3 ms
64 bytes from dfw06s03-in-x14.1e100.net: icmp_seq=3 ttl=52 time=65.3 ms
64 bytes from dfw06s03-in-x14.1e100.net: icmp_seq=4 ttl=52 time=66.5 ms

--- ipv6.google.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3071ms
rtt min/avg/max/mdev = 65.371/65.951/66.556/0.600 ms
</code>

Публичные IPv6 DNS серверы:

|                                                                                | IPv6                  | IPv4            |
^ [[http://www.opendns.com/|Open DNS]]                                           | 2620:0:ccc::2         | 208.67.222.222  |
^ :::                                                                            | 2620:0:ccd::2         | 208.67.220.220  |
^ [[http://code.google.com/speed/public-dns/docs/using.html|Google Public DNS]]  | 2001:4860:4860::8888  | 8.8.8.8         |
^ :::                                                                            | 2001:4860:4860::8844  | 8.8.4.4         |

===== Ссылки =====

Howto

  * http://blog.titax.fr/post/Centos-Fedora-et-IPv6.html
  * http://kbeezie.com/ipv6.txt
  * http://wiki.hetzner.de/index.php/Netzkonfiguration_Debian#Root-Server_2

Немного теории

  * [[http://tldp.org/HOWTO/Linux+IPv6-HOWTO/|Linux IPv6 HOWTO]]
  * [[http://www.ripe.net/internet-coordination/press-centre/understanding-ip-addressing|Understanding IP Addressing (RIPE)]]
  * [[https://version6.ru/ip6tables|Настройка IPv6-файрвола (ip6tables)]]
  * http://ip.v6net.ru/
  * https://labs.ripe.net/Members/emileaben/6to4-why-is-it-so-bad

Немного про Hurricane Electric

  * [[https://samsclass.info/ipv6/proj/he-cert-win.html|How to Earn IPv6 Certifications]]
  * [[https://chronos-tachyon.net/reference/debian-ipv6-and-hurricane-electric/|Debian, IPv6, and Hurricane Electric HOWTO]]
  * [[https://heliosj.net/main/ipv6_rdns_tunnelbroker|Tunnelbroker He.net IPv6 rDNS Delegation]]