I have a few confusions regarding the ethernet shield. The sketch works totally fine,taken from the examples but I have some confusion behind the concept of it. Why is the sketch working without the internet as well? I have found that the sketch is working without a connection to the internet, so then how does the shield work? Does it makes its own network that works without the Internet??Is it a network without the internet?
Secondly, if my friend wants to chat using the same server using the IP address, will he be able to access that if he is in another country/city? If not then why?.
Finally, I want to ask what is the need for the gateway IP. In this case, I am not using an external router to act as a gateway, then why is it asking for it in this case?? Kindly help me clear my confusion as I am new to this shield and the internals of networking. My results are shown below where telnet was used in the command prompt:
I want to know how the sketch works without the internet as this is a server example with ethernet it should work with internet. Secondly I want to know will another user having the access to the same IP anywhere in the world be abole to become a client. My last question is related to the second one. A gateway is basically a router and if i dont have a connection then why is it asking for the gateway in the arduino example sketch.
