Network error: IP Address conflict.

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3 Feb 2009
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Hey guys.

I've had this combination working before, but it seems to be playing up now...

Basically I've got an ethernet socket in the wall which connects to the Uni network. Into this socket is plugged an access point (Linksys, the blue famous one)

This allows me to connect to my uni network, but it's range is crap so I have a second router (Belkin) plugged into this. I can't use the belkin directly, as it's a DSL router rather than an access point. The second router throws out the wireless network. It's not ideal, but it was very fiddly to get it working with the uni network (proxies, ip configuration etc), so as far as possible I try not to even touch the router settings: it's working, I'm as likely to break what works as fix anything.

I used to have the PC plugged straight into the linksys: I would occasionally get an error saying "Network Error: Windows Has detected an IP Address conflict" and the little network bars have the blue working/loading circle on. It didn't seem to stop it working at the time, it would just pop up every few days.

Anyway, I reformatted the PC and suddenly it's coming up all the time. I tried swapping to a network card and it seemed to fix the problem, but now it's back with a vengeance. Every now and again it works for a few hours, but then it goes again. The odd thing is that I could understant it happening when I had the PC plugged into the access point, since my PC had been verified onto the network (It's all NAT/proxy based) and it was easiest to just clone the MAC address of the PC onto the router (same MAC address, IP conflict warnings - it seemed to make sense, and didn't cause any problems so I ignored it). However, I'm now using a wireless card with a different MAC and it's still happening.

Even stranger is that my MacBook is absolutely fine, as is my friend's windows laptop... I can't work out what's going on: the access point is performing DHCP so should just assign the IPs out to the router (192.168.1.100) and others (the mac gets 192..1.101). I'm trying to tell the PC to manually use 192.168.1.500 or something out of the way, but I can't find the option in Win7: it's not where I think it should be in network and sharing centre.

Any thoughts? A way to just set the PC to use a set IP should work, but I can't find it. I'm trying to avoid messing with the two routers at all, because it would be a major hassle if the MacBook stopped working since it's my work machine. The PC is my gaming/media machine, so it's not critical to get it working, but it's a major nuisance as you'd imagine.

Thanks
 
Static IP sounds like your best bet. Try: Control Panel -> (small icons) Network and Sharing Center -> Change Adaptor Settings (on the left) -> Your LAN adaptor -> (right click) Properties -> Internet Protocol Version 4 -> Use the.... etc
 
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It sounds like you've got two dhcp servers to be honest.
On the belkin > login to the management and disable dhcp, make sure that the belkin is connected on one of the 4 switch ports to the linksys (you may need a crossover cable) that should be all you need to do. Let the linksys worry about dhcp and nat.
Do not set an ip address of 192.168.1.500 (it won't let you anyway) but it's not a valid ip address- .1>.254 are valid on your average home network :)
 
DHCP is definitely disabled on the Belkin. It's also definitely connected to the Linksys - it works sometimes, and definitely works for the laptop(s).

And sorry, I didn't mean 500 - I wasn't paying attention and just threw out an arbitrary value. 200 will do.

I'll have another look at the adapter settings when I get back in an hour or so, but I'm sure I couldn't find anywhere to change the settings earlier.
 
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