I am switching ISP to Gigabit Networks 900Mbit broadband on City Fibre.  I am also looking to get rid of poor coverage in some parts of the house by getting a Deco XE75 mesh system.  Before I do, I just want to check that I won't have any compatibility issues.  Gigabit state the router "will have to be able to support VLAN tagging on the WAN port and DHCP Authentication as standard".  They will then let me know what VLAN to use for access.  From my reading of the information I have been able to find everything should be OK.  Does anyone have experience, or know something that I don't?