Meaning of the destination NAT on the USG2000 and USG5000


The destination NAT is mainly used to modify the destination gateway address when a mobile device user accesses the Internet.

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Meaning of the NAT on the USG2000 and USG5000
The Network Address Translation (NAT) is an address translation technology. It can convert the address in an IPv4 packet header to another address. Generally, the NAT is used to convert a private IP address in the IPv4 packet header to a public IP address, so that multiple users on the private network can access the Internet using less public IP addresses. Therefore, the NAT technology can address the IPv4 public address shortage issue caused by the expansion of the Internet scale.

Meaning of the source NAT on the USG2000 and USG5000
The source NAT indicates that the source address in a packet is converted. The source NAT modes implemented in different application scenarios are different.

Whether the USG2000 and USG5000 series support the NAT based on domain names accessed by intranet users
USG firewalls do not support NAT based on domain names accessed by intranet users. To allow users to access specified websites, you can configure the URL filtering.

NAT classification on the USG2000 and USG5000
Based on application scenarios, the NAT can be categorized as source NAT, server mapping, and destination NAT.

Meaning of GRE for the USG6000
The Generic Routing Encapsulation (GRE) protocol encapsulates data packets of certain network-layer protocols, so that the encapsulated packets can travel through another network-layer protocol. GRE is one of the tunneling technologies and is an L3 tunneling protocol. The GRE provides a transmission path for encapsulated packets by establishing a virtual point-to-point connection.

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