The 5 switch ports  seem to be OK they are all active.One from the 1600v, another connects directly to an iMac in the same room, another to a DLink FGS 005A unmanaged switch in another room, 2 ports from that then connect to an Apple TV and another music streamer, they work well no problems, all three get valid IP addresses.   Do you think if I had a managed switch, would it allow me to see the problem? Is there a way to manipulate the  DHCP server in the 1600v to provide valid addresses to the first music streamer and player? The player gets its address through the streamer. The streamer's firmware is the latest. Trying ddress reservation for the wired devices works fine for the iMac, Apple TV etc but not for the first music streamer and player.   I only got the TPLink 2.5G switch as I was going to setup a Deco X20 Mesh Wi Fi  system for all the iPads and Laptops from the remaining port.   In the end its not critical as I can always stream using a port on the 1600v, it would just be neater in the room to have all the cables from the switch.   Thanks  gsm ... View more

  Thanks david64. I realise now in my first post I failed to mention that the WAN of the VR1600 was connected directly to my NBN box and I was using a LAN port on the VR1600 via the supplied ethernet cable to the Deco. I knew from looking at other posts that in order to keep VOIP, I had to retain the VR1600.    I guess my new Deco is now kaput if it needs to be directly connected to the NBN box. My better half insists on having VOIP.  gsm75967   ... View more