@darkfinger - please open Support ticket with Asus account I think they call it Asus VIP support or something like that
We need much more complaints in order to push Asus to do something
DualWan is broken for sure here is the list what doesn't work (tested) wih latest Asus original firmware
For Load Balancing mode
load balancing is not working properly
policy routing is not working properly
For Failover mode
failover doesn't work properly
failback doesn't work properly
ping watchdog doesn't work properly
I have opened a few tickets with Asus support already, and I they have asked for syslog and I have sent them complete log
I have written them step-by-step description how to replicate problem (bug) every time (there are no exceptions) so it is clearly a bug
Since I have 5 Asus AC68U I have asked Asus to send me written confirmation that Asus DualWan feature is not working, so I can return Asus routers to my dealer in order to get money back and order Synology routers, their DualWan feature called SmartWAN simply works.
Asus told me they will try to fix DualWAN until end of March 2018, but personally I highly doubt that. There are so many things wrong with Asus DualWan implementation, they need more manpower and more time to fix all major bugs related to DualWan, not to mention smaller bugs for example port forwarding in dualwan scenario, or separate dyndns for wan1 and wan2 etc.
Gut feeling tells me they will asign one person to work on this ticket just in order to avoid sending written confirmation DualWan is broken and giving money back for 5 routers.
Their solution could probably work to some extent, still a lot of the things will be still broken, but they will concentrate on Asus mesh and other new marketing bs features, while features already built in are missing funcionality in everyday life.
On top of that, Asus support is highly buerocratic. They told me I can't get support for LTE dongle listed as supported by Asus. I have asked them why, and they told me: it is not supported in your country. On Asus 3g/4g supported dongles list, the very same dongle is supported if you are in Sweden. So I have asked them, lets pretend I live in Stockholm, can you fix your own bug in that case?
Or do I really need to move to Sweden just in order that Asus fix their own bugs?
I could start crowdfunding campaing just as proof-of-concept in order to spread the word and humiliate such "we don't give a f##k attitude"
They have ignored the question, but if you thing reasonably about this "supported but not in your country problem, even though it is officialy listed as supported" it leaves bad feeling like they are pissing on common sense. It could be this is support daily practice.