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Informing The Modem/Router
Once you've set up the fixed LAN IP address in the computer, you need to let the modem/router
know about it for two reasons. Firstly, so the modem/router knows the computer could be on the
network and, secondly, the tell the modem/router not to issue the IP address to another computer.
Log into the modem/router as usual and click the Basic button. This time, select
Dhcp from the list on the left. The following window will
appear:
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In the bottom table (Table of fixed host entries), Enter the MAC Address and the fixed LAN IP Address that we've set for the computer and press the Add button. (Note that the Mentor modem/router calls
the MAC Address the 'Ethernet address'). Some modem/routers are smart enough to discover the
MAC address for you so, if that's the case, you'd just need to confirm that it's associated with
the correct computer & LAN IP address.
Here, I've added two computers with fixed LAN IP addresses of 192.168.8.2 and 192.168.8.3 so the
next available address would be 192.168.8.4
In the top table (General DHCP parameter), set the DHCP Start IP to the next
available - in our case here, 192.168.8.4
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Note that the top table also contains the two DNS server entries we found earlier. The modem/router
should already have those addresses entered. Leave the Trigger DHCP service radio button as Enabled: Any time you want to add an "ad hoc" computer to your LAN, provided its TCP/IP properties are set to Obtain IP address automatically, the modem/router will oblige
with an IP address when asked.
When you've finished adding entries, click the Finish button and then
Save & Restart.
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