By default the file is downloaded to the default download folder as log.txt
Extract from log at beginning of link loss
Tue Oct 23 09:46:38 2018 daemon.notice netifd: Network device 'ptm0' link is
down
Tue Oct 23 09:46:38 2018 daemon.notice netifd: Interface 'wan6' has link
connectivity loss
Tue Oct 23 09:46:38 2018 daemon.debug ledfw[1640]: setting device_name to
eth4
Tue Oct 23 09:46:38 2018 daemon.debug ledfw[1640]: setting mode to link
Tue Oct 23 09:46:38 2018 daemon.info odhcpd[3376]: Raising SIGUSR1 due to
default route change
Tue Oct 23 09:46:38 2018 daemon.notice netifd: Interface 'wan' has link
connectivity loss
Tue Oct 23 09:46:38 2018 daemon.info odhcpd[3376]: Raising SIGUSR1 due to
address change on wl1_1
Tue Oct 23 09:46:39 2018 daemon.notice miniupnpd[30444]:
ProcessInterfaceWatchNotify RTM_DELADDR index=19 fam=2
Tue Oct 23 09:46:39 2018 daemon.debug ledfw[1640]: applying action on
internet:green
Tue Oct 23 09:46:39 2018 daemon.debug ledfw[1640]: writing to
/sys/class/leds/internet:green with action none
Tue Oct 23 09:46:39 2018 daemon.debug ledfw[1640]: setting brightness to 0
Tue Oct 23 09:46:39 2018 daemon.debug ledfw[1640]: applying action on
internet:red
Tue Oct 23 09:46:39 2018 daemon.debug ledfw[1640]: writing to
/sys/class/leds/internet:red with action none
Tue Oct 23 09:46:39 2018 daemon.debug ledfw[1640]: setting brightness to 0
Tue Oct 23 09:46:39 2018 daemon.debug ledfw[1640]: applying action on
internet:blue
Tue Oct 23 09:46:39 2018 daemon.debug ledfw[1640]: writing to
/sys/class/leds/internet:blue with action none
Tue Oct 23 09:46:39 2018 daemon.debug ledfw[1640]: setting brightness to 0
Example of events to look for during loss of internet connections
Start of loss off internet
.
Tue Oct 23 09:46:38 2018 daemon.notice netifd: Interface 'wan' has link connectivity loss
Online light goes off
Tue Oct 23 09:46:39 2018 daemon.debug ledfw[1640]: applying action on internet:red
Online light purple
Tue Oct 23 09:48:50 2018 daemon.notice netifd: Interface 'wwan_6' has link connectivity