After one whole week of test of Netbalancer with ZS 3.3.1 and 3.3.2, it’s now obvious that there is a big bug in these versions as soon as one member of the Netbalancer pool is a PPPOE link.
As said previvously, NetBalancer won’t bring up Online the PPPOE link after a fault (typically the regular operator drop to change public IP). It’s necessary to manually click on the “save” button of the NetBalancer setup, at each time the link went down, to bring the link up again.
Reverting back to ZS 3.2.1 with the same configuration file solves the issue.
Hope that “the boss” can fix this problem, as NetBalancer users with PPPOE internet providers cannot run ZS in last versions including security fixes.