pclerie wrote:
... I'm having a problem with L2TP/IPsec from one router.
... an EdgeRouter 5, firmware 1.9.0.
... It's one of two of the 5 that is connected to two WAN and doing some load balancing.
That sounds like load-balancing issue that was was fixed 1.9.1 (see release hotes here):
[Release Notes v1.9.1] ... [LoadBalancing] Fix bug when L2TP interface lost connectivity in load-balancing
scenario because connected routes got deleted from load balancing
routing tables.
Try 1.9.1 firmware.