Hi,
We have moved office and everything was working fine for the router vigor2925n but now I just cannot get this box to work
Setup is BT VDSL line
TP link AC1200 (all ports are enabled for VPN)
I've tried plugging in the 2925n from the TP link to the 2925n using lan on tplink and wan on the router cannot see the 2925n admin page change it to the lan port on 2925n it appears.
Tried plug into the lan on 2925n from the lan on the tplink and then wan to the switch and all pc's lose internet connection.
I've changed the WAN interpage page to reflect the same static IP address of the TPlink box but not sure if this is correct or not.

Really struggling to work out how to get this box working so any help would be appreciated.

Thanks
Brenden