I have a 2820n router that uses the WAN2 port to connect to a BThub for WAN connection.
WAN1 is disconnected and disabled but the router is logged a message every 2 minutes as follows in the syslog:
12/03/2015 22:05:40 Probe Device Syslog Receiver SYSLOG (Unknown Event)
709: 192.168.10.1: eosclwyd: DSL: DSL Rebooting...IPLM
12/03/2015 22:03:40 Probe Device Syslog Receiver SYSLOG Notify
708: 192.168.10.1: eosclwyd: DSL: DSL Rebooting...IPLM
12/03/2015 22:01:40 Probe Device Syslog Receiver SYSLOG Notify
707: 192.168.10.1: eosclwyd: DSL: DSL Rebooting...IPLM

What is DSL: DSL Rebooting...IPLM?
What causes it
How do I stop it rebooting? As nothing is connected it's a pointless task the router is doing.

Thanks,
Dave

:arrow: First check with ISP if there is any line fault

If they will tell you everything is fine...
Have you updated the unit with the correct order for fully functionality? (see released notes)

IMPORTANT NOTE: Do not upgrade directly from 3.3.5 (and earlier) to 3.3.7.5.
Due to differences in the Web UI and functionality the router MUST first be
upgraded to 3.3.5.2 prior to upgrading to 3.3.7.6.

Upgrade your router to Version 3.3.5.2 first, and afterward upgrade the router
to Version 3.3.7.6.

If you have not done this, use the *RST* file extensions and downgrade to 3.3.5 then to 3.3.5.2 then to 3.3.7.6 ... then try again if your ISP says there is NO fault
ftp://ftp.draytek.com/Vigor2820/Firmware/
The UK SEG only files are fine (modem code 232201) or if using only wan 2 any modem code file is fine