JGS524PE Lock up under prolonged load

Just to update in case others have a similar problem, I think I have found a work around.

In additions to

• JGS524PE -> System → Maintenance -> defaults settings
• Upgrading the firmware to the current 2.6.0.48 version
• LAG has not been used
• JGS524PE -> System → Multicast → IGMP Snooping → disable all
• JGS524PE -> System → Management → Broadcast Forwarding → Dynamic (default) changed to Hardware
• JGS524PE -> System → Management → Management mode → Web only (default as “Plus Utility support” exposes security vulnerabilities)

I disabled

• JGS524PE -> System → Management → Loop detection -> disable

Which appears to have prevented to lock ups. Unfortunately I can not be certain as in the past the lock ups have only occurred about once a month, so it is relatively early days atm.

As for the reason loop detection would lock up the device.

• The desk top computers are wired to the LAN network but do have wifi hardware. However there is no access point at that site so should not have carried any traffic and besides the desktops did not loose LAN access first. Wifi in the desktops has now been disabled as well.
• The lock ups appear to start between the NAS and windows server. The windows server has dual NIC and both are connected but only 1 is configured to be used. So while a small amount of broadcast traffic may go out through the second NIC, it should be minimal. And even if this minimal traffic under heavy load is enough to legitimately block traffic between the windows server and NAS, it should spread to all other ports (including direct IP address access).
• In my opinion that leaves a firmware race condition bug. It would be nice is future firmware indicated when a port was disabled due to loop detection or other blocks such as broadcast forwarding / IGMP snooping was dropping packets.

Hopefully the end result is a functional router even if disabling most of it's features is required to achieve reliable function.

Marc_V 

Thanks for the suggestion to contact support. I did and they tried to help, suggesting replacing one of the devices. I'm not convinced that would have had a high chance of success as the fault occurs with 2 devices at two sites despite changing devices. But at least they were friendly and made an effort. ATM they are short on replacement hardware but I will revisit their options in the future if required.