I'm on UFB with Vodafone using the supplied HG659 modem. I see using the admin login you can change the router to bridge mode. I have an Asus RT-AC66U router that I use for wireless, so I tried putting the Huawei into bridge mode and using the Asus to handle everything. It said it was connected and everything was looking good settings-wise, but there was no internet access at all.
So does this mean it can't be done or am I missing something with the settings?

