We have 8 sites with DSL as our secondary links for failover. All units are either 110/120 Astaro units. Most of the time when the units are given enough time to failover to the DSL link, they lock up. Logs for system and Kernel cease to be created after failover to DSL. Webadmin access stops, and ssh access hangs also. Of our 8 sites, many are Verizon DSL, but we also have Earthlink and Covad DSL. All interfaces are set for 1492 MTU, use PPPoe, and the DSL modem is set to bridged mode.
On our testing, we've been successful with pulling the plug on the primary link, and it fails over to DSL, and establishes our VPN tunnels fine. It's when check IP is used, and layer 2 is still up on cable or FIOS on the primary link that the unit hangs. One of the interesting entries in the PPPoe log is the default gateway hasn't been replaced. The default gateway is selected for the backup interface, and is expected to be replaced on the failover. Unfortunately, because the unit locks up completely, there are no logs available to help identify the problem.
Anyone experiencing anything like this?
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