In the previous installment of this article, we looked at one aspect of network troubleshooting. Now we’ll look at specific network settings that can cause network problems and how to troubleshoot them.

Incorrect network settings can result in a loss of network connectivity. The steps used to determine if your network settings are the cause of the problem is probably the single most frequent troubleshooting process that any user will go through, so it’s important to understand what’s going on so that you can get a better idea of what choices are made along the way.

Disable ICF and ICS. Enabling Internet Connection Sharing (ICS) or Internet Connection Firewall (ICF) on the connection used to connect to the network will result in connectivity problems.

To disable ICS, open the Network Connections utility in the Control Panel. Right click the local area connection and click Properties. Remove the check beside the option to Allow other network users to connect through this computer’s Internet connection.

To disable ICF, click the Settings button under Windows Firewall from the Local Area Connection Properties window. Click the button beside the Off (not recommended) option and click OK.

Use the IPCONFIG /ALL command. To verify the IP settings for the network card, type IPCONFIG /ALL at the command prompt.

XP uses TCP/IP as the default networking protocol. Each system that runs TCP/IP must have a unique IP address and appropriate subnet mask in order to communicate properly. In order for a system to further communicate with systems outside of the local area network such as on the internet or on other subnets, a default gateway must be assigned, and a DNS Server address assigned as well.

[tags]network, xp, windows, diana huggins, troubleshoot, wired, ICF, Internet Connection Firewall, ICS, Enabling Internet Connection Sharing[/tags]