Option 66 (TFTP/HTTP(S) server name)

This option is used to identify a TFTP/HTTP(S) server. The code for this option is 66, and its minimum length is 1.

  • Valid Values
    • <protocol> : // <IP address> or <domain> e.g. http://10.0.0.2 , https://provisioning.company.com
    • <IP address> or <domain> e.g. 10.0.0.2, provisioning.company.com

      where <protocol> = server type/protocol
      where <IP address> = server IP address
      where <domain> = server domain name

Without specifying the <protocol> the firmware will attempt all supported server protocol types consecutively:

  1. tftp://...
  2. http://...
  3. https://...

Examples:

DHCP option 66 = http://192.168.2.200/desktop/

  1. The first file it tries to fetch is <phoneType>.htm
    1. Example: GigasetP820IPPRO.htm
  2. Apart from phoneType.htm, the phone also tries to fetch <phoneType>-<macAddress>.htm
    1. Example: GigasetP820IPPRO-7C2F80C6E5C2.htm
  3. Then the <phoneType>-firmware.htm
    1. Example: GigasetP820IPPRO-firmware.htm

DHCP option 66 = http://192.168.2.200/desktop/{mac}.xml

The File extension can be defined by you, in this example = "xml"


  1. The first file it tries to fetch is <mac address>.xml
    1. Example: 7C2F80C6E5C2.xml
  2. Apart from phoneType.htm, the phone also tries to fetch <phoneType>-<macAddress>.htm
    1. Example: GigasetP820IPPRO-7C2F80C6E5C2.htm
  3. Then the <phoneType>-firmware.htm
    1. Example: GigasetP820IPPRO-firmware.htm

DHCP option 66 = http://192.168.2.200/desktop/{phone_type}{mac}{firmware_version}.xml

The File extension can be defined by you, in this example = "xml"

  1. The first file it tries to fetch is <phoneType><mac address><firmware_version>.xml
    1. Example: GigasetP820IPPRO7C2F80C6E5C210.1.193.0.xml
  2. Apart from phoneType.htm, the phone also tries to fetch <phoneType>-<macAddress>.htm
    1. Example: GigasetP820IPPRO-7C2F80C6E5C2.htm
  3. Then the <phoneType>-firmware.htm
    1. Example: GigasetP820IPPRO-firmware.htm

DHCP option 66 = http://192.168.2.200/desktop

This is an example of a wrong configuration.

  1. The first file it tries to fetch is "desktop"
    1. Example: desktop
  2. Apart from "desktop", the phone also tries to fetch "desktop"-<macAddress>
    1. Example: desktop-7C2F80C6E5C2
  3. Then the <phoneType>-firmware.htm
    1. Example: GigasetP820IPPRO-firmware.htm