3Com SUPERSTACK 3 WEBCACHE 3000 User Manual page 50

50 C 1: W
HAPTER EB
C C
ACHING ONCEPTS AND
interface of the Webcache; for further information, see
Auto-configuration File"
When Internet Explorer is launched it searches for a WPAD server. The
Web browser adds the subdomain "wpad" to the beginning of the
fully-qualified domain name and progressively removes subdomains until
it either finds a WPAD server answering the domain name or reaches the
third-level domain. For example, Web browsers on client machines in the
a.b.3Com.com
and then
wpad.3Com.com
downloads and executes the PAC file and configures the browser
settings.
Configuring Your DNS Server
You must define your network Domain Name System (DNS) server with
the appropriate use of domains in order to use WPAD. If you are using
the Webcache as the WPAD server, you need to create a DNS record
which resolves
For further information about the Domain Name System, see
Name System"
When a Web browser on a client machine is configured to use a WPAD
server on your network or the Webcache as a WPAD server, there may be
a pause of several seconds when it first tries to connect. The delay is
caused by the Web browser connecting to your Domain Name System
(DNS) server when it is initially started. This is normal behavior. Once the
Web browser has accessed the WPAD server or Webcache, subsequent
browser requests will operate without delays caused by WPAD.
Configuring Your DHCP Server
You can use the Web Proxy Auto-Discovery (WPAD) protocol with
Dynamic Host Configuration Protocol (DHCP) client machines on your
network if:
the DHCP server is Windows 2000-based and
I
the DHCP client machines are Windows 2000-based and
I
the DHCP client machines are using Internet Explorer 5 or later
I
D
EPLOYMENT
on page
domain would query
. If a WPAD server is found, the Web browser
wpad.your.domain.name
on page 28.
115.
,
wpad.a.b.3Com wpad.b.3Com.com
to the Webcache's IP address.
"Creating a Proxy
,
"Domain