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If both DHCP and DNS auto discovery are enabled, the requesting client attempts to use
DHCP first, and, that failing, attempts DNS. It may be useful to enable both because
some clients may not resolve the DHCP Wpad entry, but instead use the DNS entry.
Assuming that a DHCP server has already been set up in the internal network, use the
following steps to set up client auto discovery through DHCP:
1. From the internal server that is running DHCP (not the ISA server), open the DHCP
Console (Start, All Programs, Administrative Tools, DHCP).
2. Right-click on the name of the server in the left pane, and select Set Predefined
Options.
3. Click the Add button.
4. Enter Wpad for the name of the option, and then enter a data type of String, a code
of 252, and a description.
5. Click OK.
6. In the String field, enter a value of http://10.10.10.1/wpad.dat, as shown in Figure
11.4 (where 10.10.10.1 is the IP address of the ISA server; a DNS host name can be
used as well if it is configured).
7. Click OK.
8. Close the DHCP Console.
With this setting enabled, every Firewall client that receives a DHCP lease can set its proxy
settings to point to ISA Server.
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