After the sixth, any user could not access anything after R2.
Public IP addresses
unique addresses that are public domain addresses
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nat
Public IP addresses must be unique across the entire Internet.
Any host or user can get a public IPv6 network address because the number of available IPv6 addresses is extremely large.​ smb
Because the number of public addresses is limited.
public
All IPv4 IP addresses can be divided into two major groups: global, or public, or external - this group can also be called 'WAN addresses' — those that are used in the Internet, and private, or local, or internal addresses — those that are used in the local network (LAN).
public ip-addresses are used in the Internet (they are registered addresses). private ip-addresses are used in local networks. imagine you have a computer in your local network that has a public ip-address and your PC has simultaneously an Internet connection: if you try to ping this pc you wouldn't be able to tell which computer is replying, the local one or the webserver.
Private addresses are used within an organization, and they are not visible to the outside. Within your local network, you should use the address ranges recommended in RFC 1918, for example, IP addresses that have "10" in the first byte (octet). An equipment with NAT enabled will translate these addresses to a single public address (or a few of them) - making it look, to the outside world, as if the information from several computers originated at the single public address.Thus, the combination of private addresses and NAT will not "provide extra external IP addresses", instead, it will save those valuable IP addresses, requiring only a single public address for a larger network. Cisco mentions, as a rule-of-thumb, a limit of about 4000 machines per public IP address.Private addresses are used within an organization, and they are not visible to the outside. Within your local network, you should use the address ranges recommended in RFC 1918, for example, IP addresses that have "10" in the first byte (octet). An equipment with NAT enabled will translate these addresses to a single public address (or a few of them) - making it look, to the outside world, as if the information from several computers originated at the single public address.Thus, the combination of private addresses and NAT will not "provide extra external IP addresses", instead, it will save those valuable IP addresses, requiring only a single public address for a larger network. Cisco mentions, as a rule-of-thumb, a limit of about 4000 machines per public IP address.Private addresses are used within an organization, and they are not visible to the outside. Within your local network, you should use the address ranges recommended in RFC 1918, for example, IP addresses that have "10" in the first byte (octet). An equipment with NAT enabled will translate these addresses to a single public address (or a few of them) - making it look, to the outside world, as if the information from several computers originated at the single public address.Thus, the combination of private addresses and NAT will not "provide extra external IP addresses", instead, it will save those valuable IP addresses, requiring only a single public address for a larger network. Cisco mentions, as a rule-of-thumb, a limit of about 4000 machines per public IP address.Private addresses are used within an organization, and they are not visible to the outside. Within your local network, you should use the address ranges recommended in RFC 1918, for example, IP addresses that have "10" in the first byte (octet). An equipment with NAT enabled will translate these addresses to a single public address (or a few of them) - making it look, to the outside world, as if the information from several computers originated at the single public address.Thus, the combination of private addresses and NAT will not "provide extra external IP addresses", instead, it will save those valuable IP addresses, requiring only a single public address for a larger network. Cisco mentions, as a rule-of-thumb, a limit of about 4000 machines per public IP address.
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