Ntpd and gps

  • Is there a way to connect a gps to an alix board (via usb) and then tell ntpd to get its time from the gps unit using pfsense?

  • Depends on the GPS device and how it provides clock. Most likely it will require a custom kernel with SYNC_PPS enabled. It will definitely require manual editing of ntp.conf to fudge local clock as a stratum 1.

  • I guess I'm not looking for PPS capability (no serial gps) but wanted to plug up a usb model we have laying around the office and see what happens.  I was curious if anyone had done this using pfsense already and could save me some time. 

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