User guide

SerVision MVG 400 System Guide
Installing the MVG 400 System 26
• External IP: An IP on each external network to which it is connected (cabled LAN,
WiFi, and/or cellular). These are the IP addresses of the MVG 400 unit itself. Optimally,
these addresses should also be static. If they are not, various solutions are available to
make it possible to connect the unit to the internet, and to connect to the unit remotely
via the internet, as explained below.
Connecting the MVG 400 to an External Network
The following types of external network connections are supported:
• Ethernet cable
• Cellular
• WiFi
The MVG 400 has a distinct IP address on each of the external networks to which it is
connected. For example, if it is connected to a LAN via Ethernet cable, to a wireless network
via WiFi, and to a cellular network via cellular modem, it will have three external IPs – one
on each network.
Each of the external IP addresses of the unit can be static – fixed within the network – or
dynamic – assigned by the network on the fly. Dynamic IP addresses can change at any
moment. This makes it difficult to connect to the unit remotely, because the address to use to
access it is not known. Therefore, it is best to try to ensure that the unit has static external IP
addresses whenever possible. The system administrator of each network is responsible for
deciding whether static or dynamic IP addresses are assigned to devices in the network. Each
network has its own policies in this regard.
The public IP address of the MVG 400 is the address through which it is actually connected to
the internet. This address is assigned to the unit by the ISP or cellular provider, and it may be
either static or dynamic. If the service provider assigns a static IP address to the unit, client
applications can easily be configured to connect to it. On the other hand, if the unit is assigned
a dynamic IP address, the address may be different each time the unit connects to the internet,
and clients cannot easily connect to it. In this case, you can use a dynamic DNS (DDNS)
service to facilitate internet connections to the unit. For additional information, see Proxy and
DDNS Settings, page 76.
NOTE: To ascertain whether your MVG 400 has a static or dynamic IP address, contact
your ISP or cellular provider.
NOTE: Some devices connect to the internet even though they do not have public IP
addresses (IP addresses that are recognized on the internet) assigned to them. In
this case, they connect to a LAN that is managed by the service provider, and that
LAN connects to the internet by means of a public IP. To ascertain whether your
unit has a public IP address, contact your service provider. You may have to
specifically request a public IP address from your provider. If your unit cannot be
allocated a public IP address, remote access to your MVG 400 via the internet can
only be established by means of a SerVision proxy server. For additional
information, see Proxy and DDNS Settings, page 76, or contact your vendor.