We have a WatchGuard SOHO 6 with the latest firmware (6.4.1) and an ISP-supplied DSL modem. The firebox's PPPoE settings look like this:
We've been having a problem lately where our internet service will go down every once in a while at no particular time of the day or stress levels, and the only way to get it back up is to reset the modem, the router, or both. Sometimes just the router will do, others it has to be the modem and then the router.
It does not seem to be related to our external IP changing, which logs indicate this is handled fine at least sometimes. (I say at least sometimes because often after a modem reset we get a new IP.)
Both boxes are pretty old but otherwise are working fine.
Last night our connection dropped:
2010-02-24 22:33:38 Local0.Warning PPPoE: PPPoE connection terminated, service unavailable @35813ms 2010-02-24 22:33:39 Local0.Error MONITOR: Protocol Down @35814ms 2010-02-24 22:33:40 Local0.Info MONITOR: Ethernet Link Up @35815ms 2010-02-24 22:33:47 Local0.Warning PPPoE: Timeout locating PPPoE server, will retry @35821ms 2010-02-24 22:34:36 Local0.Warning PPPoE: entry duplicated 2 times @35821ms 2010-02-24 22:34:36 Local0.Error PPPoE: Unable to locate PPPoE server @35871ms 2010-02-24 22:34:36 Local0.Error MONITOR: Protocol Error @35871ms 2010-02-24 22:34:37 Local0.Info MONITOR: Ethernet Link Up @35872ms 2010-02-24 22:34:44 Local0.Warning PPPoE: Timeout locating PPPoE server, will retry @35878ms 2010-02-24 22:35:33 Local0.Warning PPPoE: entry duplicated 2 times @35878ms 2010-02-24 22:35:33 Local0.Error PPPoE: Unable to locate PPPoE server @35928ms
...the last five lines repeated ad nauseam every minute until this morning when I reset the modem. Still didn't work. The syslog at the time of modem reset had a momentary interruption from the pattern it had been repeating:
2010-02-25 08:32:17 Local0.Error MONITOR: Protocol Error @71734ms 2010-02-25 08:32:18 Local0.Info MONITOR: Ethernet Link Up @71735ms 2010-02-25 08:32:24 Local0.Warning PPPoE: Timeout locating PPPoE server, will retry @71741ms 2010-02-25 08:33:04 Local0.Warning PPPoE: entry duplicated 2 times @71741ms 2010-02-25 08:33:07 Local0.Error MONITOR: Ethernet Link Down @71784ms 2010-02-25 08:33:11 Local0.Error MONITOR: entry duplicated 3 times @71784ms 2010-02-25 08:33:11 Local0.Info MONITOR: Ethernet Link Up @71788ms 2010-02-25 08:33:12 Local0.Info CONFIG: Config file updated @71789ms 2010-02-25 08:33:12 Local0.Info PPPoE: PPPoE service established @71789ms 2010-02-25 08:33:12 Local0.Info PPP: Starting login @71789ms 2010-02-25 08:34:12 Local0.Error PPP: PPP negotiation failed during LCP @71849ms
...after that it continued the same sequence of 'error, link up, timeout, duplicated, unable to locate' that it had been doing all night. Then I reset the router, and it worked fine. What's the most likely cause?