1.6 Public IP

A public IP associated with a Cloud VPS enables the latter to be reached via the Internet network. Furthermore, the Cloud VPS to which a public IP is assigned, has direct access to the network on which you can rely on a very high dedicated connection speed, almost comparable to the maximum speed of the actual network card.
 
The public IP provided lets you connect to the Cloud VPS via tools such as RDP (Windows) or SSH (Linux).

IPv6 is a new Internet orotocol developed to overcome the shortage of IPv4 addresses.
The growing and constant increase of devices connected to the Internet (PCs, Laptops, Smartphones, Tablets, SmartTVs, VoIPs, home automation-enabled devices, etc.) has saturated the available public IP addresses, the latest blocks of IPv4 were distributed to the 5 RIR (Regional Internet Registry - the organizations that manage the allocation of internet number resources in a specific geographic region) on 3 February 2011.

Differences between IPv4 and IPv6

	IPv4	IPv6
bit	32 bit	128 bit
format	4 groups of 3 decimal numbers separated by a dot 62.149.188.210 2 8 . 28 . 28 . 28 2 8 in decimal = 256 a number between 0 and 255	8 groups of 4 numbers (2 hexadecimal) separated by 2 dots 2001:0db8:85a3:0000:1319:8a2e:0370:7344 2 828 : 2828 : 2828 : 2828 : 2828 : 2828 : 2828 : 2828 2 8 in esadecimai = ff a number between 00 and ff
n° Ip addresses	28x28x28x28 2 32 approximately 4,3x109 4,3 billion	216x216x216x216x216x216x216x216 2 128 = 1632 approximately 3,4x1038 340 undecillion

Advantages of IPv6

The billion new addresses that IPv6 provides, allow users to have, not just one IPv6 address (like with IPv4), but blocks of IP addresses in a 64 bit address space range (around 1.8x108 therefore 18 billion-billion combinations), making the NAT (Network Address Translation) unnecessary assigning unique addresses to each single device.

Another advantage is security: IPv6 includes IPsec technology (Internet Protocol Security), considered optional for IPv4.

IPv6 address syntax

There are rules on how to write IPv6 addresses:

• use only lowercase letters
• any four-digit group of zeros can be reduced to a single zero
  2001:0db8:85a3:0000:0000:8a2e:0370:7344 = 2001:0db8:85a3:0:0:8a2e:0370:7344
• a sequence of two or more groups of zeros can be reduced to ::
  2001:0db8:85a3:0000:0000:8a2e:0370:7344 = 2001:0db8:85a3::8a2e:0370:7344
• IPv6 can only include one : therefore this address would not be valid 2001::85a3::0370:7344
  2001::85a3::0370:7344 non è accettato
• it is not necessary to write the initial zeros of each block
  2001:0db8:85a3:70aa:0101:1000:8a2e:0370:7344 = 2001:db8:85a3:70aa:101:1000:8a2e:370:7344
• the last 32 bit can be written in decimal format, e.g.
  
  having as IPv6
  2001:0db8:85a3:0000:0000:8a2e:0370:7344
  
  0370 = 03 e 70 in hexadecimal = 3 and 112 in decimal
  7344 = 73 e 44 in hexadecimal = 115 and 68 in decimal
  
  therefore
  
  2001:0db8:85a3:0000:0000:8a2e:0370:7344 = 2001:0db8:85a3:0000:0000:8a2e:3.112.115.68

Transition from IPv4 to IPv6

Our cloud infrastructure uses Dual-Stack technology to manage the transition phase from IPv4 to IPv6 and these will operate side by side ensuring compatibility of both protocols.

Converting IPv4 to IPv6

Converting an IPv4 address to an IPv6 address consists in representing the decimal format of the IPv4 in the hexadecimal format of the IPv6.

If, for example your IPv4 is 62.149.188.210 you would proceed by converting the 4 decimal groups in hexadecimal groups:
therefore this address 62.149.188.210 can be represented like so 3e95:bcd2 and so

62.149.188.210 = 0000:0000:0000:0000:0000:ffff:3e95:bcd2 = ::ffff:3e95:bcd2