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(Step 8). The DNS server returns the response to the proxy server (Step 9). Finally,
the proxy server uses the obtained IP address of www.someother.com. to contact it
and provides the necessary information to the client (Step 10).
A computer in the ZZZ Corporation needs to resolve a DNS query for
www.someother.com. It submits an appropriate query to the assigned DNS server
(Step 1). If its cache contains necessary data, then the server will respond to the
client. Otherwise the server forwards the query to the DNS server containing the
zzz.com. zone (Step 2). This server forwards the query to the external server (Step
3) through the firewall. The latter performs the name resolution similar to the
previous case (Steps 4-9) and passes the result to the client though the firewall and
the chain of participated in the resolution servers (Steps 10-12). Then the client
uses the resolved IP address of www.someother.com. to contact it through the
firewall and download the desired web page.
Windows 2000 White Paper 52