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OPT_NTP provides the Network Time Protocol (NTP) for fli4l. This is not to be confused with the normal Time Protocol. The protocols are not compatible and thus new client programs understanding the NTP are required.
OPT_NTP works in both server and client mode. In client mode it synchronizes fli4l's system time with Internet time references (Time Servers) or uses the time information of a connected Radio clock.
In server mode OPT_NTP acts as a time server for the local net (LAN). NTP uses port 123.
Like with all fli4l packages configuration is done by adapting the file
Path/fli4l-4.0.0-r60785-testing/<config>/ntp.txt to your needs.
Default: OPT_NTP='no'
Setting this to 'no' completely deactivates OPT_NTP. No changes to the fli4l boot medium resp. archive opt.img are made. OPT_NTP does not overwrite any other part of the fli4l installation. To activate OPT_NTP set OPT_NTP to 'yes'.
This variable determines the type of a locally connected reference clock. Possible values are listed in Tab. 1.1. If no reference clock is available and hence system time is only synchronized by other network time servers specify “none” here.
| Shortcut | Model |
| none | no Reference Clock |
| mouseclock-nts | mouseCLOCK NTS |
| mouseclock-usb-ii | mouseCLOCK USB v2.0 |
| sure | Sure RPC DCF77 |
| neoclock4x | NeoClock4X DCF77 |
| hopf-seriell | hopf DCF77/GPS (serial) |
This variable specifies the interface to which the reference clock is connected. Typically, this is /dev/ttySx for the (x+1)-th RS232-Interface or /dev/ttyUSBx for the (x+1)-th USB-Interface, i.e. /dev/ttyS0 or /dev/ttyUSB1.
This variable specifies the the number of servers for time synchronisation.
This variable contains the IP address or the FQDN of the server to be used for time synchronisation.
This variable controls the type of relationship between fli4l and the time Server. When setting the value to 'peer', the time is synchronized with the defined server. This is used if more local NTP servers exist (usually using time sources with similar Stratum) and that should be synchronized with each other. Setting this value to 'server' specifies the defined time server as the source for the router's NTP server. This is for using external time servers (which usually have time sources with a higher stratum).
This variable is optional.
'yes' speeds up the synchronization with the defined NTP Server
by using eight NTP adjustment packages.
This variable is optional.
'yes' speeds up the synchronization with the defined NTP Server
by using 16 NTP adjustment packages.
This variable is optional.
With 'yes' this NTP server is preferred over other NTP servers with
the same Stratum.
This variable is optional.
This variable defines the minimum time interval between
NTP time synchronization packets. Values between 4 (15 s) and 6 (64 s)
are allowed.
This variable is optional.
This variable defines the maximum time interval between
NTP time synchronization packets. Values between 10 (1024 s) and 17
(131 702 s = around 36.4 h) are allowed.
This variable is optional.
This variable specifies the NTP packet's version number to be used. Values
between 1 and 4 are allowed.
With 'yes' the clock of the BIOS is also used as a time source. This enables the NTP daemon to continue to work as a time server even if none of the specified time servers can be reached or the connected radio clock does not provide a valid time anymore.
Defines the priority of the local clock within the NTP hierarchy. The higher the value the more inaccurate is the accuracy of the time source used. A server using the time of the reference clock has a stratum of '1'. The BIOS clock should normally have a value from '10' to '12' assigned.
This variable specifies the number of IPv4 networks which are allowed to access the router via NTP.
This variable holds a reference to an IPv4 network that is allowed to access the NTP server, for example, IP_NET_1.
This variable is optional.
'yes' allows peering of fli4l with NTP servers in the referenced IPv4 network.
This variable specifies the number of IPv6 networks which are allowed to access the router via NTP.
This variable holds a reference to an IPv6 network that is allowed to access the NTP server, for example, IPV6_NET_1.
This variable is optional.
'yes' allows peering of fli4l with NTP servers in the referenced IPv6 network.
Setting this variable to 'yes' will display information on the time synchronization in the WebGUI in case of OPT_HTTPD='yes'. With an activated RRDTOOL_NTP graphs for the time drift are generated in addition.
Specifying 'yes' here will indicate the state of NTP synchronisation on the defined LEDs given that the package “hwsupp” defines any LEDs. The following assignment applies:
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