My 4801 NanoBSD NTP server

(This page is mostly for historical interest)

I downloaded my original NanoBSD (FreeBSD 6.2-STABLE) Compact Flash image from here, and have a copy stored on DropBox in case that one ever goes away. (warning - file is 44Mbyte)

config files: The GPS is connected via the 2nd serial port (This is all typed while logged into the 4801 over a serial cable using minicom, the /cfg/ files get copied over the /etc/ ones at boot)

first mount the config files so we can edit them.

#mount /cfg

then enable the /dev/gps0 -> /dev/ttyd1 symlink at boot

#echo "link ttyd1 gps0" >> /cfg/devfs.conf

start dhcp on sis0 ethernet port so we get working network

#echo "background_dhclient=yes" >> /cfg/rc.conf.local
#echo "ifconfig_sis0=DHCP" >> /cfg/rc.conf.local

now set up ntp server with PPS from the GPS unit (add more servers if you want)

#echo "enable pps" >> /cfg/ntp.conf
#echo "server 127.127.20.0 mode 2 prefer" >> /cfg/ntp.conf
#echo "restrict 127.0.0.1" >> /cfg/ntp.conf
#echo "restrict ::1" >> /cfg/ntp.conf
#echo "restrict -4 default kod notrap nomodify nopeer" >> /cfg/ntp.conf
#echo "restrict -6 default kod notrap nomodify nopeer" >> /cfg/ntp.conf
#echo "driftfile /etc/ntp.drift" >> /cfg/ntp.conf
#echo "0" >>/cfg/ntp.drift

and finish up

#umount /cfg
#reboot