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Quote:
Originally Posted by Bruno2020
Can you tell me how to open port 20? Do i need to modify anything in the /etc/services file ?
Bruno,
You do not need to worry about port 20 (yet). That line of thinking is leading you off track (sorry Rudi) because you need to establish you have a working route (network connection) between your private IP address space and the Internet. What you are describing (so far) is just a simple network configuration issue.
You cannot ping your ftp host. ping does not use ports. The ping protocol works at the transport layer.
Quote:
There is no TCP or UDP port number associated with ICMP packets as these numbers are associated with the transport layer above.
So, if you cannot ping, you can do nothing (unless ping is blocked by a firewall rule, but then you have other problems, and you are not ready for that yet) .... on any of the ports from 1 to over 65,000 (65,535 TCP and 65,535 UDP ports, to be exact), open or not, LOL. You can open port 20 as wide as a truck and you will still not be able to connect to it; because you have described basic networking issues. You cannot ping at the transport layer (yet).
Since you can ping your own interface (that is good news, at least) , you need to try to ping the next hop on your network (normally your router, but you have not provided a diagram. Please upload a sketch as I mentioned, using the attachment feature of the site, not an external img hosting link).
Do you know what the IP address of your router is?
Also, can you run the arp command on your computer?
Try:
That is the next step.... you need to see if you can or cannot connect (ping) the next hop in your network.
You are getting "ahead of yourself" if you try to work / troubleshoot at the TCP or UDP layer before you make sure you are good to go lower in the stack (at the transport layer).
That is why we need to establish you can ping first.
Understand yet? To troubleshoot networking issues, it is best to start at the bottom and work your way up the protocol stack (not the other way around). If you learn to troubleshoot like this, you will find it much easier and much faster to solve problems, I promise.
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