The cause of the reduced Internet speed was an old switch

The connection to the Internet is via my cable modem ch7466ce from compal (In bridge mode), the router TL-WDR4300 from tp-link and then finally via the switch from netgear model gs108 (Construction year 2003).
My Internet provider is Vodafone with 400 Mbps downlink and 25 Mbps uplink. But unfortunately I do not have the full speed on the computer. As it turned out, the old netgear switch was the cause.

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Ports for the shared printer via a router with NAT Forwarding

A printer behind a router is usually not available for computers in front of it or from the Internet.

To make this printer accessible, several forwarding rules can be created in the router in the NAT area. To do this, you must know the port numbers, or service port numbers and their protocols:

Service Port Protocol Description
 9100  TCP  PDL Data Stream / Datatransfer
 161  UDP  Simple Network Management Protocol (SNMP) / Status query
 162  UDP  Simple Network Management Protocol (SNMP) / Status query

The printer protocol must be changed from LPR to RAW in the configuration of the port in Windows.