I have a question about my internet connection.

By pbell5 ·
I have a wireless router that I use for my personal MacBook Pro laptop which works great. However, I also work at home and I use a desktop PC running Windows XP. I log onto our company network from that PC and they don't allow me to use the wireless router to log on. The setup I typically use is an A/B network switch. Position A is used when I am not working and I am using my personal laptop wirelessly, and position B is for the PC when I am working, connected directly to the modem. Recently I have had difficulties with the PC not acquiring an IP address despite turning the modem off and on once I flip the switch to the B position. The internet connection at the A position through the router always works. How do I get the wired connection to consistently work? Do I have to assign an IP address to the PC every time? Thanks for your help.

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Yes and no.

by seanferd In reply to I have a question about m ...

Yes, an IP address needs to be assigned to the connection every time it changes. No, you need not do it manually. And you shouldn't be rebooting the modem for anything. If DHCP turned on in the computer and the modem, you should get an address. If you statically assign IP addresses, the same addresses will always be used.

Are the referenced router and modem two separate things? If so, I would cable to the router, not the modem.

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by robo_dev In reply to I have a question about m ...

Some cable modems are actually firewall/routers, and some are just modems.

What cable modem model do you have?

You plug your PC via ethernet into this device, correct?

I do not understand the the A/B this used to switch the ethernet from your PC to the wireless router used for your mac?

On the XP machine, if you goto a command prompt and type ipconfig /all, this will show you if you have a valid IP or not.

Ipconfig /renew should renew the address, as will the Windows 'repair' option on the adapter.

If these do not work, then it's the DHCP server in the cable modem that is at fault.

Some cable companies want you to use only one device, so the cable modem is provisioned with only one mac address allowed on the LAN side. Most routers have the capability of 'cloning' the mac address of a PC.

If this is your problem, then the solution is to clone the 'allowed' mac address of the PC into the wireless router configuration, that way the cable modem is happy.

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Wire, Wireless and Address space conflicts

by oldbaritone In reply to I have a question about m ...

I've done the same kind of thing, for other reasons.

Simply, I just tell the laptop to turn the wireless "off" and plug in a 10-base cable. The cable comes from a port on the wireless router.

The only time there is an issue is if I forget to unplug the wire when I turn the wireless back "on." Then the computer gets two separate addresses in the same address pool, and it will complain about it.

Unplugging the cable fixes the problem, and I don't even need a switch.

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