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ISP :

I have a BT inifinty modem but I need to setup VPN site-to-site for a customer.
Whilst the BT router doesnt work, I've bought an Archer D2 AC750 which I should be able to connect to the BT infinity box via the EWAN feature.

I am assuming I connect to the AC750 over wifi then form the VPN via that router then traffic goes through the BT infinity router then out...

Can someone help on how/where I find the right information on how to configure this and get it working?

many thanks