I’ve been able to set up sending and listening to http requests locally using 127.0.0.1:8000. I want to try doing it using the internet now.
I have a VPN with port forwarding enabled, but sending requests to that IP address and port does not yield a response like it did when doing it locally.
Can anyone clarify which address I should be listening on in order to receive http requests from the internet? I tried 0.0.0.0 and a few inet addresses from ip add, but none of them work.
In unicast traffic is sent to the network interface when it matches the IP. In a layer 2 lan this is done by using ARP to query the Mac associated with the IP. When traffic gets routed in layer 3 it is done by subnet.
When a new packet is received the OS then will put the data into a buffer accessible by the application. When an application “listens” it is simply telling the OS that it wants to be the one to process incoming data on a particular IP and port.
With multicast, a client requests a particular IP be sent to it via IGMP packets.