For cPanel & WHM version 11.50
Internet Protocol (IP) is the communications protocol that routes traffic across the Internet. IPv4, which stands for Internet Protocol version 4, carries the vast majority of Internet traffic. However, IPv4 only allows approximately four billion addresses, and there is currently a shortage of available IPv4 addresses. IPv6 addresses the problem of IPv4 address exhaustion.
service network restartcommand removes the IPv6 addresses from the network device. To restart your IPv6 configuration, you must run the
/etc/init.d/cpipv6 restartcommand after you restart the network service. For more information, read our The cpipv6 Script documentation.
The following table lists some of the differences between IPv4 and IPv6:
|Format||A 32-bit address that consists of four period-separated octets.||A 128-bit address that consists of eight colon-separated groups of four hexadecimal digits. Hexadecimal digits use the numerals |
|Availability||4.2 billion possible addresses.||340 undecillion possible addresses. This is equivalent to 3.4 x 1038 addresses, or 2128 possible addresses.|
|Accessibility||Anyone can access an IPv4 address.||You can only access an IPv6 address if you use an IPv6-enabled network and server.|
Why should I want an IPv6 address?
- While there is a finite number of IPv4 addresses, there is essentially no limit to the number of IPv6 addresses.
- The shortage of IPv4 addresses causes some hosting providers' prices for dedicated IPv4 addresses to increase.
- The Internet authority that provides IP addresses to hosting providers (IANA) requires justification and audits of IP addresses to avoid waste.
- The availability of IPv6 addresses helps hosting companies and website owners avoid the impact of this shortage.
- Your server will use both an IPv6 address and an IPv4 address.
- Most browsers try to access the IPv6 address first, but they implement a very short fail time. If the page does not load in that time, the browser accesses the IPv4 address for the site.
- Eventually, more IPv6 options and functionality will become available.
Services with IPv6 support
For more information about IPv6, read the following third-party resources:
- Wikipedia provides an in-depth explanation of IPv6. This article includes a brief history of IPv6, some comparisons between IPv4 and IPv6, and a technical explanation of IPv6 implementation.
- Google provides a brief history and the logic behind IPv6.
- You can test your current IPv4 and IPv6 status and availability.