conflict between internet and local networks

Dell / INSPIRON 9300
June 10, 2009 at 02:56:54
Specs: Windows XP home, n/a
I live/work in a shared space with a wireless internet router. I also have a private wired network based around a 3com gigabit switch that I use for my work PCs. This is for both the speed and to deliberately keep the work PCs off the internet, apart from one laptop which I use to access both networks. This has worked perfectly for a couple of years, until now.

Recently I have had problems connecting my laptop to both the internet and my separate wired network at the same time.

Whenever I plug in the wired network cable the internet stops working. The instant I pull it out the internet works again.

I have noticed that when I plug in any pc to the gigabit switch it has problems assiging an IP, so I have to do it manually. DHCP works for the wireless network, though.

The IPs for the laptop are:
wireless:

IP Address: 192.168.1.101
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.254

wired network:
IP Address: 192.168.0.3
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.0.1

Also, I can connect to the wireless router admin page at the gateway address (192.168.1.254). So the wireless network itself works from the laptop. just not the internet.

I'm using a d-link gigabit cardbus adapter in the laptop, but I have the same problem using the dell's built-in network port.

Also, this happened both before and after a fresh install of XP. Any ideas?


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#1
June 10, 2009 at 05:37:40
I'm surprised that you had it working in the first place. It's supposed to be one enabled interface at a time.

How do you know when a politician is lying? His mouth is moving.


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#2
June 10, 2009 at 07:29:07
hi - who says that? I can assure you it worked fine for ages. It only stopped working in the last few weeks. I thought it had something to do with installing zonealarm around that time but a complete reinstall of windows didn't fix it.

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#3
June 10, 2009 at 07:44:58
I'm not saying that you didn't have it working. I'm just surprised that it was.

I did a quick search on Google. Someone recommended removing the default gateway from the wired NIC.

How do you know when a politician is lying? His mouth is moving.


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Related Solutions

#4
June 10, 2009 at 08:38:28
Brilliant! that seems to work. Thanks very much. Not sure what you searched for because all my searches were fruitless. ah well.

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#5
June 10, 2009 at 10:53:00
Hey, I'm glad it worked. I learned something myself.

I searched for: wired & wireless at the same time.

How do you know when a politician is lying? His mouth is moving.


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