Unlocking Sophos UTM DHCP Capabilities
The Dynamic Host Configuration protocol allows the client to receive options from the DHCP server describing the network configuration and various services that are available on the network. When configuring dhcpd(8) or dhclient(8) , options must often be declared. The syntax for declaring options, and the names and formats of the options that can be declared, are documented here. Cisco DHCP Server Configuration for IP - Cisco Community Jun 15, 2020 UniFi - USG: How to Configure Custom DHCP Options
If the dhcp server you are using is configured to provide the ntp-servers option, you can configure your dhclient to request ntp-servers by adding ntp-servers to the default request line in dhclient.conf, as shown at the end of this example from Ubuntu Linux (as of 19.04, but present since at least 12.04):
@Kronos A DHCP "client" is a piece of software. I think I'm reading a different question than you guys. ;) "neither OS X nor Windows 7 are able to auto-configure their NTP servers" is NOT asking how to configure them, it's stating that they don't support it (which is true). 5. After making delegations to the custom DHCP option click Save near the bottom of the page. Pre-defined DHCP Options . DHCP UniFi Controller - Option 43 (IP Address) DHCP NTP Server - Option 42 (IP address) DHCP Network Boot - Option 66 (Server) Option 67 (Filename) DHCP Time Offset - Option 2 ; DHCP TFTP Server - Option 66 The dhcp server you are using must be configured to provide the ntp-servers option Configure your dhclient to request ntp-servers (it doesn't by default). To do this add ntp-servers to the default request line in /etc/dhcp3/dhclient.conf; Create an /etc/ntp.conf with all of the other settings that you wish A different NTP server can be configured either from the UI or from management platforms such as Central. It can also be provisioned through the DHCP option 42. If the NTP server is configured, it takes precedence over the DHCP option 42 provisioned value. The NTP server provisioned through the DHCP option 42 is used if no server is configured.
Jan 22, 2020 · The vendor-option-space declaration tells the DHCP server to use options in the SUNW option space to construct the DHCPv4 vendor-encapsulated-options option. This is a limitation of that option - the DHCPv4 VIVSO and the DHCPv6 VSIO options can have multiple vendor definitions all at once (even transmitted to the same client), so it is not
Jun 30, 2020 · DHCP option 12: host name of the client, very useful for IoT and any device without user; DHCP option 15: specifies the domain name that client should use as suffix when resolving hostnames via the Domain Name System; DHCP option 42: list of the NTP Servers by order of preference, used for time synchronization of the client Jul 27, 2018 · Option 42 (NTP Server) Description The NTP server option specifies the NTP server , available to the client. The code for the NTP server option is 42. The minimum length for this option is 4 octets, and the length MUST always be a multiple of 4. VALIDVALUE 184.108.40.206, de.pool.ntp.org SETTING ntp_server