Pertanyaan seputar jaringan komputer

Pertanyaan seputar PROXY...

Part 1

How does the proxy works?
The Proxy works between the client and the web server. It receives the requests from the clients, communicates with the web server on behalf of the client, receives the request back from the web server and passes it back to the client.

How does the client communicate with the Proxy?
Modify your browser proxy settings so that it isset to the proxy. The proxy listens to the port for incoming connections. On receipt of a connection from a client, it opens a socket for communication

How does the proxy reply to the Client?
After the proxy gets the reply from the proxy server, it writes back on the socket it had opened with the client.

How do I configure my Browser for sonnecting to the proxy?
You will also need to configure your web browser to use your proxy. This depends on your browser. In Internet Explorer, you can set the proxy in "Internet Options" in the Connections tab under LAN Settings. In Netscape (and derived browsers, such as Mozilla), you can set the proxy in Edit->Preferences and then select Advanced and Proxies.

In both cases you need to give the address of the proxy and the port number which you gave when you started the proxy. You can run the proxy and browser on the same computer without any problems.

I am confused on what is question #2 in Ethereal Lab is asking, "Within the IP packet header, what is the value in the upper layer protocol field?". Which field is it asking to look for in ethereal, I can't find something that says upper layer protocol field?

If you go throught the IP Header of a packet, it contains a field which says which transport protocol to deliver the packet to. The IP header in etheral too contains this information and is very much visible. Just see the packets closely.

sumber

http://www.cs.ucsb.edu/~sudipto/TA/cs176a/faq-extra.html