Home Networking NIGHTMARE

May 17, 2009 at 02:08:54
Specs: Windows XP
First off I am a power user and there is rarely a problem I cannot fix, so you can probably reserve any Tier 1 type fixes.

3 Desktops all running Windows XP SP3
2 of them are HP Pavilions, mine is custom built with ASUS mobo
I've been through 6 different routers of 3 different brands and styles, because it SEEMS like a router issue but it simply cannot be after that many replacements.

Usually we have these 3 IP addy's:

When everything is fine, the default gateway is

At random moments ranging from an hour to a week, one of the computers will suddenly have a new default gateway. It is usually something strange and last time it was

When this happens the PC with the bad gateway cannot access the interent, but can ping all other computers on the network at <1ms each. However, if you ping it from another PC on the network its a bit high like 10-13ms

The way I "fix" it is by doing 'ipconfig /release' on each machine, unplugging all cables from the router, power cycling the router and connecting 1 PC at a time in the order of which we need internet access the most. (because sometimes only 2 can connect)

This problem does not occur when only 2 PCs are connected to the router.

I have disabled wireless for the purposes of troubleshooting and it still happens.

I have heard of this problem with Vista specifically, and in that case there is a registry fix related to DHCP / router interactions. I have not heard of it with XP.'

Also, please note this can happen at ANY time. Since it doesn't just happen when turning 1 machine on/off or release/new or plug/unplug cables that may rule out some simpler issues.

See More: Home Networking NIGHTMARE

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May 17, 2009 at 06:56:09
I normally use static IP addresses on small networks but if you just want to troubleshoot the problem as is, let me ask a question. Do you have an HP printer on the network with an IP address of it's own?

The IP that you posted belongs to HP.

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

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May 17, 2009 at 09:05:55
Sounds like you have a rouge DHCP server on your network. Run a packet sniffer, such as wireshark, to capture all DHCP traffic.

If that's not the problem, then you might have some sort of malware on the effected computer.

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May 17, 2009 at 13:53:31
There is no HP printer here. I have a Canon but it is usually off when I'm not using it. Thanks for the suggestions I will probably just try a static IP setup if my router allows. I looked for it the other day and could not find a way to set that up within my routers settings page... I'll search again.

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Related Solutions

May 17, 2009 at 15:37:06
You set the static IPs in the LAN & TCP/IP properties on each PC, not on the router.

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

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May 17, 2009 at 18:58:50
Are you sure that will work? I mean I know I can set static info on each PC but when I've tried that in the past without setting the router to know it also, it was rejected by the router. I know for a fact many routers have a page for this, such as D-Link so why would those exist if all you had to do was set it on the PC?

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May 17, 2009 at 20:58:16
I had a Dlink & I always used static IPs with it. Of course, I chose IPs our of the DHCP range. If I needed to use DHCP, I limited the range to the amount of PCs that needed it.

The router never rejected the configuration.

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

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May 17, 2009 at 21:24:09
I just had a eureka moment! There are several printers showing up on our network that don't physically exist. I haven't looked into it yet, but I have a feeling one of them is HP (because someone suggested that a HP printer was the issue due the numbers in the fake gateway)

More to come...

But in the meantime here's more info with NBTSTAT logs and such:

*edit* I've deleted a total of 6 devices listed in printers & faxes that didn't physically exist. I fully expect the problem to be fixed now, but only time will tell. :) Thanks to everyone that contributed.

*edit2* Nope not fixed, an iPhone just got the same bulls--- IP/gateway

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May 18, 2009 at 06:02:11
Install wireshark and have a look at your traffic in order to figure out what's causing this.

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May 18, 2009 at 07:49:16
I did, look at the link in my above post.

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