DHCP Relay problems - Cisco Community

WPAD uses several methods for finding out location of the PAC script. If the method does not provide information about the port or the path name, then the client should use, as defaults, port 80 and /wpad.dat respectively. Sep 27, 2011 · WPAD using DHCP. For complex networks with multiple gateways or egress points, DHCP is a better option than using DNS. With DHCP, a web proxy can be configured as a scope option, allowing for the assignment of a unique proxy server on a per-subnet basis. For more info about creating a WPAD entry, see Creating a WPAD entry in DNS. After the database file propagates to the server, the DNS name, wpad..com resolves to the server name that includes your automatic configuration file. Note IE11 creates a default URL template based on the host name,wpad. For example, https://wpad..com Aug 15, 2016 · The Web Proxy Auto-Discovery Protocol (WPAD), developed by Microsoft in 1999, is turned on by default and is designed for computers to automatically discover which web proxy they should be using WPAD=http://server.domain/config.pac. Location of a proxy server (Web Proxy Auto Detection) used by Internet browsers to automatically detect proxy settings. Full client support for DHCP is not as ubiquitous as for DNS. That is, not all clients are equipped to take advantage of DHCP for their essential network configuration (assignment of IP address, network mask, etc). APIs for DHCP are not as widely available. Luckily, using DHCP for WPAD does not require either of these facilities.

This tool, developed by SpiderLabs, will respond to WPAD requests (among other protocols) allowing it to collect the NetNTLMv2 hashes from users with WPAD enabled. I use this in almost every penetration test I perform and is the quickest way to get username and password hashes for offline cracking or "pass the hash" attacks.

The Web Proxy Auto-Discovery Protocol (WPAD) is a method for a browser to automatically discover the proxy configuration file, without any browser configuration, using settings in DNS or DHCP. For more information about this method, refer to the following Internet Engineering Task Force (IETF) draft: [PROXY]: Web Proxy Auto-Discovery Protocol (WPAD) - YouTube

Configuring WPAD (option 252)

The WPAD protocol can use a DNS or DHCP server to locate a PAC file. DHCP detection involves the URL being pushed to the user in the DHCP assignment, while DNS detection is based on an informed guess, using known information about the DNS. A web browser that supports both methods checks the DHCP assignment first, and then attempts the DNS method. Cisco DHCP server setting for WPAD - Cisco Community Cisco DHCP server setting for WPAD Hi All, i have a problem with DHCP Server. we used Cisco WS-C4503-E with IOS cat4500-ipbasek9-mz.122-53.SG1.bin. for the existing DHCP server is running well.-----ip dhcp pool ACB123 network default-router The DHCP server should be configured to serve a 252 entry in the DHCP information sent to a user. When configured this entry includes a direct link to the wpad.dat file. Windows 2003 DHCP