Hello there… first post ever. 
I realized that (using 2.9.27 routerboard) dynamic address list ( added with firewall rules) - eg black-list - are not retained upon a reboot. Is this a feature, a bug ? Is ther any hidden way to retain these addresses at least until they expire ?
Thanks
They expire on reboot because they are dynamic. You could write a script that enumerated the dynamic entries and added them as static, however they wouldn’t auto-expire then.
We use quite a few dynamic black lists- however if they get erased on a reboot its not a big deal because they just get blacklisted again on the next hit that originally blacklisted them. . . althoguh we only reboot once in a blue moon on that box.
Thank you for your response. However I guess address lists could still be dynamic and retained in a file (purhaps as an option in case of low space).
Well you are certainly right : The lists rebuilt by themselves as soon as the same cause appear.
Keep up with this great product, and congratulation for all your contribution.