WPAD - Web Proxy Autodiscovery Protocol
When using wpad there are some things that you should take note of;
- DHCP wpad will override DNS wpad
- DHCP 252 option can in some cases be slightly slower to resolve than DNS - there may be a patch for WinInet to resolve this.
- You should always use lower case - wpad.dat (it is case sensitive)
- DHCP will allow either a URL or a file location for wpad.dat
Within IE on the LAN settings tab if you have WPAD “automatically detect settings” enabled and also configure a proxy server the WPAD should override the manual proxy configuration.