Either bridge the network or redirect the necessary ports if you are natting inside your network. Having mikrotik on only one side of the link effectively prevents you from using the transparent bridging mode.
Alright, maybe we can get a native Italian speaker to help.
))) WiFi ((( – WAN – – LAN – DVR
^^ Is this how your camera’s and DVR are connected today?
If so, you cannot see the cameras because the TP-Link is likely performing network address translation (NAT) between the WAN and LAN. You either need to setup network address translation (NAT) rules on the TP-LInk to translate the IP addressing on the camera’s and LHG units to LAN IPs or more likely you need to create a layer 2 domain (bridge) that the camera’s and DVR unit share. The shared layer 2 domain is likely the solution you need. Most camera systems use discovery methods that are link-local and are unable to pass routed interfaces (also unable to pass through NAT boundaries). If my drawing is accurate, you can bridge the two LHG units and connect them to the LAN interface of your TP-Link. As long as the IP addressing is within a common network everything will work. Their are several ways you could do this in a better manner but we’d need to get past the communication barrier.
It would help to post a drawing of what you are trying to do. Even something drawn on a napkin and a picture taken of it with a cell phone will do if you don’t have Microsoft Visio.
Is the LHG connected to the Internet directly or is it be used to connect to another location?
Are you able to configure the LHG? If so, please run the command:
/export hide-sensitive
Just to be certain. You are trying to access the DVR system locally and remotely?
Like Jarda said the LHG and the TP-Link are both likely doing NAT, network address translation. That’s most likely your problem but I need to know what the LHG connects to and if it is public or private IPv4 addressed to be certain.