Predefined DHCP Options
Palo Alto Networks firewalls support user-defined and predefined DHCP options in the DHCP server implementation. Such options are configured on the DHCP server and sent to the clients that sent a DHCPREQUEST to the server. The clients are said to inherit and implement the options that they are programmed to accept.
The firewall supports the following predefined options on its DHCP servers, shown in the order in which they appear on the DHCP Server configuration screen:
DHCP Option Name
IP Pool Subnet (mask)
Domain Name System (DNS) server address (primary and secondary)
Windows Internet Name Service (WINS) server address (primary and secondary)
Network Information Service (NIS) server address (primary and secondary)
Network Time Protocol (NTP) server address (primary and secondary)
Post Office Protocol Version 3 (POP3) server address
Simple Mail Transfer Protocol (SMTP) server address
As mentioned, you can also configure vendor-specific and customized options, which support a wide variety of office equipment, such as IP phones and wireless infrastructure devices. Each option code supports multiple values, which can be IP address, ASCII, or hexadecimal format. With the firewall enhanced DCHP option support, branch offices do not need to purchase and manage their own DHCP servers in order to provide vendor-specific and customized options to DHCP clients.
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