General rules for this subnet

Source IP	Target IP	Target port	Protocol	Function	Additional information
PC – SDC	ANY		ICMP	Ping (connection test)	The Internet Control Message Protocol (ICMP) is used in computer networks to exchange information and error messages
DNS server	53	TCP	DNS name resolution	The Transmission Control Protocol (TCP) is a network protocol that defines the way in which data is to be exchanged between network components. Almost all of the operating systems used by modern computers can handle TCP and use it to exchange data with other computers. The translation of domain names (e.g. sew.de) into IP addresses that can be processed by computers is referred to as "name resolution". This is an Internet service provided by the Domain Name System (DNS).
User	123	UDP	Time synchronization	The Network Time Protocol (NTP) is a standard used for synchronizing clocks in computer systems over packet-based communication networks. NTP uses the connectionless transport protocol UDP.

Source IP

Target IP

Target port

Protocol

Function

Additional information

PC – SDC

ANY

ICMP

Ping (connection test)

The Internet Control Message Protocol (ICMP) is used in computer networks to exchange information and error messages

DNS server

TCP

DNS name resolution

The Transmission Control Protocol (TCP) is a network protocol that defines the way in which data is to be exchanged between network components. Almost all of the operating systems used by modern computers can handle TCP and use it to exchange data with other computers.

The translation of domain names (e.g. sew.de) into IP addresses that can be processed by computers is referred to as "name resolution". This is an Internet service provided by the Domain Name System (DNS).

User

123

UDP

Time synchronization

The Network Time Protocol (NTP) is a standard used for synchronizing clocks in computer systems over packet-based communication networks. NTP uses the connectionless transport protocol UDP.

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