Proxies are important devices for either giving connectivity
of nodes on a private network to a public one, or for allowing
enhanced security. In Figure Ch4.1 Host1 makes a direct
connection to the Internet through the Proxy. It does this
by communicating the destination address and port to a specific
port on the proxy server, which will then forward the request
onto the destination. In this case, the proxy is setup to
receive this traffic on port 1001. It then forwards this
data onto the Internet.
In this case, 102.10.10.3 is a real Internet address, while
the 192.168.0.x network is a private network, which cannot
directly connect onto the Internet. The proxy thus offers
Internet connectivity to any node on this network, through
the proxy server.
Figure Ch4.1:
Challenge 4
Name:
Email:
Matriculation number:
Programme:
Institution:
1. If the proxy server in Figure
Ch4.1 is setup to act as a proxy for WWW and FTP
traffic, complete Figure Ch4.2 for the setup of
the proxy settings on Host1.
2. Outline how the server code for
the client-server connection in the Teaching Pack
could be modified so that it could act as a proxy
server for the network connection given in Figure
Ch4.3. In this case, the host at 192.168.0.10 requires
to communicate with port 2000 on 201.10.11.3.
3. How might the proxy server software
be enhanced so that it allows for additional security
checking?
