Instructions

UM-0085-B09 DT80 Range User Manual Page 239

Note4: Once the NAT router has been set up to forward the required ports, you should now be able to access the DT80 from outside

the local network using the network's public IP address. So in this example, you could enter

http://203.54.192.12 into a web

browser and you should see the DT80 web interface.

Note5: The public IP address (203.54.192.12) should only be used from computers outside the local network. If you wanted to access

the DT80 from PC1 or PC2 you would still use the DT80's private address, 192.168.1.7.

 Adding a DNS Entry

It is customary (although not essential) to set up a Domain Name System (DNS) entry for an Internet-accessible DT80.

This allows you to associate a meaningful name, e.g.

mydt80.gigadata.com, with the DT80's public IP address, so

users can just type in the name without having to remember the actual IP address.

Depending on the structure of the local network, this may involve configuring the local DNS server (if any) and/or

requesting that the ISP add an entry to its DNS server. For more details, contact your network administrator or ISP.

Note: This assumes that the ISP has assigned a static IP address. More commonly, it will assign a dynamic IP address, in which case

you will need to use a dynamic DNS service in order to locate it.

 Dynamic DNS

The DT80 does not directly support Dynamic DNS (DDNS) on the Ethernet interface – only on the integrated modem

interface (for DT8xM models). However, most Ethernet router or gateway devices include a DDNS client. You could

therefore create a DDNS account as described in Dynamic DNS (P218) and then configure the router/gateway DDNS

client to update it with the DT80's public IP address.

Direct Internet Connection

The other possible configuration is where the DT80 is essentially connected directly to the Internet. A typical setup is

shown in Figure 90 below.

Figure 94: Typical Ethernet LAN with DT80 directly connected to the Internet

In this case two public IP addresses have been allocated by the ISP – one (203.54.192.13) for the DT80 and one

(203.54.192.12) for everything else, via the NAT router.

Because the DT80 is now effectively directly connected to the ISP's network, its IP address, subnet mask, gateway and

DNS server addresses will need to be set up using values provided by the ISP.

Once the DT80's network profile settings have been set it should be possible to connect to it from either a local computer

(e.g. PC1) or a remote system on the Internet, using its unique public IP address (203.54.192.13).

Note that in this case port forwarding is not required, as requests for the DT80 no longer pass through the NAT router.

If desired, you can request that your ISP set up a DNS entry so that the DT80 can be referred to by name, e.g.

mydt80.nanodata.com.