@Philbert many many thanks! So firewall is like an antivirus or internet security? it "knows" what activity should be blocked? as for forwarding: I have to digest your answer and see what do I have...

@Philbert many many thanks! So firewall is like an antivirus or internet security? it "knows" what activity should be blocked? as for forwarding: I have to digest your answer and see what do I have...

@Philbert Thank you for your prompt answer: firewall: where do I find lan host or wan host? do I need both? forwarding: where do I find service port, ip address, internal port of programs I want to...

@Philbert meanwhile the problem was solved by resetting the router. to complete the picture: I'm with windows 10 pro winver 1809 as modem I use a lousy cable device by sagemcom I was given by my...

Greetings I work with Sagemcom as modem and td-w9970 as router cannot enter 192.168.1.1 (tp-link configuration site) What can I do? thank you