6/20/2023 0 Comments Utm definition![]() ![]() ESP: The Encapsulating Security Payload (ESP) is a part of the IPsec tunneling protocol suite that provides encryption services for tunneled data via VPN.Once you have selected IP, provide the number of the protocol to be encapsulated within IP, for example 121 (representing the SMP protocol). IP: The Internet Protocol (IP) is a network and transport protocol used for exchanging data over the Internet.Note that IPv4 firewall rules do not work with ICMPv6 and IPv6 firewall rules do not work with ICMP. Once you have opted for ICMP or ICMPv6, select the ICMP code/type. ICMP/ICMPv6: The Internet Control Message Protocol (ICMP) is chiefly used to send error messages, indicating, for example, that a requested service is not available or that a host or router could not be reached.When you have selected TCP/UDP, the same configuration options can be edited as for TCP or UDP. TCP/UDP: A combination of TCP and UDP appropriate for application protocols that use both sub protocols such as DNS.When you have selected UDP, the same configuration options can be edited as for TCP. The receiving computer does not signal the sender when receiving a data packet. This statelessness, however, also means that UDP cannot recognize when packets are lost or dropped. Because it does not keep state, UDP is faster than TCP, especially when sending small amounts of data. UDP: The User Datagram Protocol (UDP) uses port numbers between 5 and is a stateless protocol.Source port: Enter the source port either as single port number (e.g., 80) or as a range (e.g., 1024:64000), using a colon as delimiter.Destination port: Enter the destination port either as single port number (e.g., 80) or as a range (e.g., 1024:64000), using a colon as delimiter.TCP sessions begin with a three way handshake and connections are closed at the end of the session. In a TCP connection, the receiver notifies the sender when a data packet was successfully received (connection related protocol). Lost packets can be recognized through TCP and be requested again. TCP: Transmission Control Protocol (TCP) connections use port numbers ranging from 0 to 65535. Type of definition: Select the definition type. Name: Enter a descriptive name for this definition. (Note that further parameters of the service definition will be displayed depending on the selected definition type.) The Add Service Definition dialog box opens. On the Service Definitions page, click New Service Definition. To create a service definition, proceed as follows: Tip – When you click on the Info icon of a service definition in the Service Definitions list, you can see all configuration options in which the service definition is used. You can use services to determine the types of traffic accepted or denied by Sophos UTM. Services are definitions of certain types of network traffic and combine information about a protocol such as TCP Transmission Control Protocol or UDP User Datagram Protocol as well as protocol-related options such as port numbers. On the Definitions & Users > Service Definitions page you can centrally define and manage services and service groups. ![]()
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