Draytek 2862ac (ADSL) with TP Link MR200/AC750 (4G)

I have a Draytek Vigor 2862ac with a slow ADSL connection which I want to load balance with a 4G connection. The 4G connection is via a TP Link Archer MR200 (also known as AC750). The TP Link gets a good 4G signal in my loft and I have an ethernet cable from this to the WAN2 connection on the Draytek.

The Draytek gets and IP address from the TP Link so it can definitely see it but for the life in me I can't get any traffic from devices connected to the Draytek to route over the TP Link.

I'm thinking it's a configuration problem with the TP Link but no idea what - has anyone else got a similar setup working?

Are the private LAN ranges different, having the same range on the LAN and WAN side of the Draytek could confuse things.

In reply to a post by MrSaffron:

Are the private LAN ranges different, having the same range on the LAN and WAN side of the Draytek could confuse things.

Thanks for the reply but I already have them set separately. The Draytek is using 192.168.1.1 ~ and the TP Link 10.0.0.1 ~

The Draytek gets an IP from the TP Link OK of 10.0.0.102 but alas no internet!

Does the Draytek have a gateway set via DHCP? It needs the TP Link IP address to be set as the gateway device.

Another possibility is that the Draytek may not be routing the private LAN ranges, i.e. the load balancing may be expecting a public IP range.

Thanks for your replies.

I updated firmware, reset everything, removed load balancing on the 4g connection and then added device groups to specify which device uses which WAN and hey presto, seems to work perfectly.