AT&T West → [Modem] 4100 modem IP 192.168.1.64 ?

I am using a Speedstream 4100 modem with PPPOE and authentication located at the modem. I'm sure it's no big deal because it does not appear to be causing any issues, but in looking at my Windows XP system event log, every time my PC is booted up, there is an entry that says that an attempt to assign IP 192.168.1.64 was unsuccessful. What causes this and is there a way to avoid it?

Thanks!

Go here and scan down the page to lines 121 and 122.

The SS4100 can be configured to assign a private IP address via DHCP. It is hard coded to assign 192.168.1.64; but only does that if configured to assign that IP address, or if the modem can't get a public IP address to share.

Until the beginning of December I had been running my SS4100 to share the public IP address with the router; since then I have it configured to assign 192.168.1.64 to the router. Just trying to assess which I would prefer.

Perhaps you can tell us how you have your SS4100 configured, since there are a couple of different ways which will work.

Thanks Norman. I am at work now but I will do as you suggest and post more tonite.

Here are lines 121 and 122 from the tech readout:

121 DHCP Start IP Address 192.168.1.64
122 DHCP End IP Address 192.168.1.64

And this is the actual error seen in my system event log:
Event Type: Error
Event Source: Dhcp
Event Category: None
Event ID: 1002
Date: 12/9/2005
Time: 5:05:43 PM
User: N/A
Computer: BOBZ
Description:
The IP address lease 192.168.1.64 for the Network Card with network address 000D88198D4D has been denied by the DHCP server 192.168.0.1 (The DHCP Server sent a DHCPNACK message).

In the SS4100 Connection configuration screen there is a question:

Let LAN device share Internet address?

No, use private IP address.
Yes, use public IP address

It was set to "Yes"...I am going to change it to no, reboot and see what happens.

Rebooted twice...no more error! Even though it was not causing any problems that I saw before, I feel better now not seeing any errors in my system event log.

Its nothing to worry about

The modem's DHCP server is active when the modem is in
"PPP is on the modem" mode.

To avoid that XP system event log message:

The modem's DHCP server is inactive when the modem's mode is in
"PPP is on the computer"
OR
"Bridged Mode (PPPoE is not used)".
OR
You could change your computers TCP/IP properties to match this Image Depending on what you do with your computer this address may be better 192.168.1.64

If you are connecting your computer directly to the SS4100, you probably should follow wayjac's advice. Sharing the public IP address, or using 192.168.1.64 allows unsolicited packets to reach the computer, and you are then relying on having the Windows XP firewall properly configured for protection. Moving your assigned IP address on the computer to a different IP address, as in his image, will block all unsolicited packets (at the expense of being unable to use P2P, and some features of IM, which require open ports and unsolicited packet permission to those ports).