Detection packet protocol types for the USG2000 and USG5000 series

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The supported detection packet protocol types include TCP, ICMP, HTTP, DNS, and RADIUS. If service types provided by the server are beyond these five types, you are advised to use ICMP packets to check the server reachability.

Other related questions:
Detection packet protocol types for the USG9000 series
The supported detection packet protocol types include TCP, ICMP, HTTP, DNS, and RADIUS. If service types provided by the server are beyond these five types, you are advised to use ICMP packets to check the server reachability.

Routing protocol types based on the used algorithm on the USG2000 and USG5000 series
Based on the type of algorithm they use, dynamic routing protocols are classified into the following types: Distance-vector routing protocol: includes RIP and BGP. BGP is also called path-vector protocol. Link-state routing protocol: includes OSPF and IS-IS.

Routing protocol types based on the application range on the USG2000 and USG5000 series
Based on the application range, routing protocols are classified into the following types: Interior Gateway Protocol (IGP): runs inside an AS, such as RIP, OSPF, and IS-IS. Exterior Gateway Protocol (EGP): runs between different ASs, such as BGP.

Protocol used in IPSec packet encapsulation and decapsulation on the USG2000 and USG5000 series
IPSec uses Authentication Header (AH) and Encapsulating Security Payload (ESP) to implement the encryption and decryption of IP packets.

Packet detection protocols supported by the USG6000 series
TCP, ICMP, Hypertext Transfer Protocol (HTTP), Domain Name Service (DNS), and Remote Authentication Dial In User Service (RADIUS) are supported. If any service type provided by the server is not included in the five protocols, it is recommended that ICMP be used to verify the reachability of the server.

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