TrueNAS:

- TrueNAS server v13.0.

- Dedicated Intel Gigabit NIC.

- Switch negotiation all-AUTO, same for TrueNAS, with FlowControl DISABLED.

TP-Link Stack:

- 8-Switch-Stack of T3700G-28TQ.

- 10G Ring topolgy using SFP+ FO ports.

- DoS Defend all options enabled, except for Blat Attack

(When we enabled Blat Attack prevention PC communication between stack members died but that is another story).

- At least 50 users accessing TrueNAS storage through a single port on switch No. 8.

- Switch No. 8 is on a separate VLAN.

- We are 100% sure DoS Defend is the problem killing link to TrueNAS on load increase, because it reconnects when DoS Defend is totally disabled.

- We are also 100% sure it is DoS Defend because TrueNAS reconnects if we change the NIC MAC address using ifconfig command.

This is a blocking bug. We need firmware upgrade to fix this issue. Or a guaranteed and reasonable workaround.

Any help is much appreciated.