Problem connecting to internet with wired ethernet

Shortly after installing the Leopard 10.5.2 update, I could not connect to the internet through the wired ethernet connection. Connected wireless with no problem. Spent time with Apple tech. Determined that the machine was fine. Told to check the wall port. Had a windows PC connect fine through same cable and wall port. Also brought the MacBook to a different location. Connected to the ethernet port and connected to the internet successfully. Determined that the MacBook kept using an IP address of 192.168.1.103. This is the wrong address for my connection. The correct IP address is 172.16.7.1. Installed this address manually in the MacBook and established a connection. The MacBook cannot seem to connect automatically at this location. The Windows PC connects fine. The MacBook keeps coming up with the wrong IP address. Any idea what could be causing this??

The IP address when connected to a router will start with 192.168.x.x.
When connected to a modem you will get a different address.
When you connect to a cable modem for the first time it looks at the Media Access Control (MAC) address of whatever is connected.
It is a unique number for your device.
It only attaches to one device and provides an internet connection to that device by way of an IP address.
If you wish to connect another device and get an IP address for that new device, you need the modem to start over, since it has a monogamous relationship with the connected device.
In order to have the modem drop its relationship, it needs to be restarted.
This is not true of a dsl modem.
It sounds like your modem has linked with the MAC address of the router.
In order to connect directly to the modem and get it to link to your computer, you need to unplug the router from power.
Disconnect its ethernet cable.
Restart the modem after about 15 seconds and wait until it restarts, about 2 minutes.
Then reconnect the modem and you will likely be able to connect to the internet.

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