Using the version cooked with lime-sdk solves the problem.
Firmware Version LiMe 17.06 DaybootRely (17.06 rev. ac18095 20171019_1644)
/ LuCI lede-17.01 branch (git-18.033.59178-3d46f25)
bmx6 -c version: BMX6-0.1-alpha comPatibility=16
revision=4016a1980d900309771e432d1f7c741d6c48d477
But, really, those download builds should be updated.,,,
On Tue, Feb 6, 2018 at 3:34 PM, bruno vianna <bruno(a)pobox.com> wrote:
 
 Dear meshies
 We're trying to upgrade to version 17, but there are issues with Internet
 routing.
 Even though the devices see each other and create a mesh network, Internet
 works only on the gateway router. We tried in meshes with wdr3500 and 4310
 and got the same problem.
 We got the binary images from here [1]. I also attached the output of
 "bmx6 -cp && bmx6 -cd8" in the gateway and in the other router as per
Gui's
 suggestion.
 Any clues?
 Thanks
 Bruno
 [1] 
https://downloads.libremesh.org/dayboot_rely/17.06/targets/
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