LSN, CGN, NAT444 - There is widespread

LSN, CGN, NAT444 - There is widespread -

Traditional NAT has been in use for over a decade and typically was deployed between networks of clients and SP network ( Service Provider). Using one or more public IP addresses, NAT provides internet connectivity to customers using private IP addresses within their network. But as SP is out of public IPv4 addresses, they can not allocate IPv4 increase public responds to meet the demand of the population increasingly Internet. LSN (Large Scale NAT), also known as CGN (Carrier Grade NAT) or NAT444, fills this gap - it brings in another layer of NAT, which is done in the SP network. This enables SPs to use private IPv4 address, even to NAT client devices and the public IPv4 address translation is done in the SP network. The following diagram shows how LSN works

As can be seen a double translation happens -. Once the NAT EC and the SP network before the traffic goes public Internet. Accordingly SPs are able to allocate a private IPv4 address SP side facing NAT devices and record public IPv4 addresses. But LSN, by virtue of its requirements for deployment, has an additional level of complexity. Some of the key requirements of an LSN solution are:

1. Ability to manage large numbers of simultaneous sessions and support for the high rate of new establishment connection
2. policies quotas leads - LSN must apply quota policies on the amount of resources that each client can consume. These can vary in number of IP addresses and user ports allocated by the restriction of connection speed. This is done to ensure that every customer gets the right resources to its needs without stifling other clients.
3. The functional requirements as
   1. Allow internal users / applications to use the same external IP address for all of their sessions
   2. hairpinning - to allow customers behind the same device LSN to communicate using their public IP addresses
   3. Endpoint Filtering independent - make the work of NAT traversal
4. full logging capabilities to monitor port allocation and IP use, and for compliance

until the world of hobby to a whole IPv6 environment, as LSN solutions continue to fill the void while allowing IPv6 to come . For example, another variant of LSN NAT464. - This allows the access network between clients and SP to be an IPv6 network connectivity while enabling end to end IPv4

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