NVR not being detected by hub (network) when using ethernet cable
I've recently puchased a three hub Deco M5 system and set it up without issue. However, when I hard wire my NVR (digital recorder for CCTV) it does not show up on the network and therefore I can't access it remotely (via appropriate software). All the other clients eg. PC's, phones etc, connect wirelessly or hard wire without issue.
I'd previously used the same ethernet cable to hardwire the NVR to my main router and it worked fine then. Just to be on the safeside, I've tried hardwiring my PC to the hub, via the same ethernet cable (with Wi-Fi turned off!), this works perfectly and shows up on the network map through my brower via 198.168.x.x. So I've ruled out a duff cable, and defective ethernet socket on the hub (by the way I've also tried with the other two hubs with no success).
Its a high quality NVR, Dahua brand. It doesnt have Wi-Fi (like most NVR's) so hard wiring is my only option and due to a new location, I can't hard wire it as previously to my main router, I've got to use a hub....that's one reason I purchased the M5 system.
Can any of you nice folks out there suggest why the hub(s) wont detect the hard wired NVR, but it'll detect other clients? Or any other diagnostics that my unearth what's going on. It's completely stumped me after many hours of trying to get it working.
Thank you in advance.