My experience has been different routers act differently. The Actiontec router I have does not allow slingbox to work over the LAN, ditto any surveillance cameras, nothing over Wifi where the device is part of the LAN. I have to disable the Wifi connection if I am testing my cameras with my smartphone so I am over the Cell network.
My linksys router worked great for so many years, but it throttled the speed of newer applications for some reason. My new Netgear router handles everything great -except I have to reboot it every so often when I realize the speed over WiFi has drastically dropped. And the new protocol whatever it's called works much better than the old over Wifi but not all devices I have can use that. (IPV6)
So I too would be looking at the router or some setting on it.
My linksys router worked great for so many years, but it throttled the speed of newer applications for some reason. My new Netgear router handles everything great -except I have to reboot it every so often when I realize the speed over WiFi has drastically dropped. And the new protocol whatever it's called works much better than the old over Wifi but not all devices I have can use that. (IPV6)
So I too would be looking at the router or some setting on it.