If you experience Lag or issues with parties due to your NAT type being "Moderate/Strict" Try these...
Connection
Use a wired connection if possible, Wired is always stronger than wireless!
If you can't. Maybe use Ethernet plugs/Powerline adapters
I use these...http://www.argos.co.uk/static/Product/partNumber/4273888.htm
Channel Changing
Try going into your router settings by typing in the routers IP address (If you don't know how to, read below!) and change the channel to 1,6 or 11 (default setting will be "AUTO"). They are the ones with less interference.
Port Forwarding
Go into the port forwarding section and open the ports which Xbox One generally use
which are...
Port 88 (UDP)
Port 3074 (UDP and TCP)
Port 53 (UDP and TCP)
Port 80 (TCP)
Port 500 (UDP)
Port 3544 (UDP)
Port 4500 (UDP)
Also open these specifically for Fifa 16...
Port 3659 (UDP and TCP)
For COD Black Ops 3
Port 3075 (UDP)
Access to Router Settings
If you don't know your router IP address, just Google "Default IP address for "so and so" router" Then type the IP in the address bar of your browser.
I'll list some of them here...
BT Homehub - 192.168.1.254 or 192.168.1.1
Virgin - 192.168.0.1
TalkTalk - 192.168.1.1
Sky - 192.168.0.1
The password to access it should be on the back of the router.
If it isn't, then again...Google "default password for "so and so" router".
Most of the time it is; Username = Admin, Password = password
Enable UPnP
Inside the firewall settings, there will be a section called "UPnP" just hit enable. Basically opens the ports when asked by a device.
Sources...
http://support.xbox.com/en-GB/xbox-one/networking/network-ports-used-xbox-live
http://help.ea.com/uk/article/online-ports-for-fifa-16/
Connection
Use a wired connection if possible, Wired is always stronger than wireless!
If you can't. Maybe use Ethernet plugs/Powerline adapters
I use these...http://www.argos.co.uk/static/Product/partNumber/4273888.htm
Channel Changing
Try going into your router settings by typing in the routers IP address (If you don't know how to, read below!) and change the channel to 1,6 or 11 (default setting will be "AUTO"). They are the ones with less interference.
Port Forwarding
Go into the port forwarding section and open the ports which Xbox One generally use
which are...
Port 88 (UDP)
Port 3074 (UDP and TCP)
Port 53 (UDP and TCP)
Port 80 (TCP)
Port 500 (UDP)
Port 3544 (UDP)
Port 4500 (UDP)
Also open these specifically for Fifa 16...
Port 3659 (UDP and TCP)
For COD Black Ops 3
Port 3075 (UDP)
Access to Router Settings
If you don't know your router IP address, just Google "Default IP address for "so and so" router" Then type the IP in the address bar of your browser.
I'll list some of them here...
BT Homehub - 192.168.1.254 or 192.168.1.1
Virgin - 192.168.0.1
TalkTalk - 192.168.1.1
Sky - 192.168.0.1
The password to access it should be on the back of the router.
If it isn't, then again...Google "default password for "so and so" router".
Most of the time it is; Username = Admin, Password = password
Enable UPnP
Inside the firewall settings, there will be a section called "UPnP" just hit enable. Basically opens the ports when asked by a device.
Sources...
http://support.xbox.com/en-GB/xbox-one/networking/network-ports-used-xbox-live
http://help.ea.com/uk/article/online-ports-for-fifa-16/