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Windows 7: IP address conflicts


23 Dec 2010   #1
allend66

Windows 7 Home Premium x64 OEM --> RTM clean install
 
 
IP address conflicts

Hi, didn't know whether or not to post this in the network category, but here goes...

In a nutshell - sometimes 2 machines want to have the same IP address (192.168.1.36)

My setup is: Win7 HP x64 (main rig, wired + wifi) going to a 4 port wifi router that also connects a WinXP Pro x86 (now dedicated torrenter & jukebox, wired only), and an Xbox360 (wired only).

The router's address (default gateway) is 192.168.1.1. It assigns (or Win7 assigns) IP address to my main rig, ethernet (192.168.1.33) and wifi (192.168.1.34)

Then the WinXP box will want to assign itself 192.168.1.36, the same address as the Xbox. With all machines' settings at "automatic", I find it strange and frustrating that from a pool of 255 numbers to choose from I get a conflict. (Note: this is a combined wireless/4-port router, before I had a monoport modem (192.168.1.1) and a 4 port wifi router (192.168.2.1), but no problems, IP addresses started at 192.168.2.2 upto 192.168.2.6) Question 1 - Why do addresses start at 192.168.1.33, not at 192.168.1.2?

Now, I've already gone into the Xbox settings and instead of "automatic", I've selected "custom" and I've even input the same numbers (IP address, default gateway, DNS servers, submask) as the auto but it doesn't connect to Xbox Live!. Ok - I reset it to auto - fine.

Question 2 - I assume I can demand the WinXP to always use, for example, 192.168.1.99, leaving 192.168.1.36 for the Xbox? HOW? The problem only seems to happen if I turn something on after the others are booted and stable, typically both PCs are running, I boot the Xbox for a bit of gameage, the Xbox will rob the WinXP address and then I get the yellow exclamation triangle in the WinXP tray telling of a conflict of IP addresses.

Thank you for patience and help!
D


My System SpecsSystem Spec
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23 Dec 2010   #2
kegobeer

Windows 7 Ultimate x64 SP1
 
 

The router assigns IP addresses using DHCP. It sounds like your computer has been configured to use a static IP address that is inside the DHCP range of the router. If you ever set a static IP address on a computer you have to make sure that it's not in the block of IP addresses that the router will assign.

1) Have you configured your computer(s) to use static IP addresses? If so, why?
2) What is the make/model of your router?
My System SpecsSystem Spec
23 Dec 2010   #3
allend66

Windows 7 Home Premium x64 OEM --> RTM clean install
 
 

Thanks for the reply kegobeer. I'm at work at the moment, so will postback info in 3 or 4 hours' time.

D
My System SpecsSystem Spec
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23 Dec 2010   #4
allend66

Windows 7 Home Premium x64 OEM --> RTM clean install
 
 

Quote   Quote: Originally Posted by kegobeer View Post
The router assigns IP addresses using DHCP. It sounds like your computer has been configured to use a static IP address that is inside the DHCP range of the router. If you ever set a static IP address on a computer you have to make sure that it's not in the block of IP addresses that the router will assign.

1) Have you configured your computer(s) to use static IP addresses? If so, why?
2) What is the make/model of your router?
OK, so I'm lost with DHCP - no idea what it is, or how it works.

1. I'm assuming by static you mean fixed, in which case I can tell you from ethernet properties --> Internet Protocol (TCP/IP) --> properties "Obtain IP address automatically" this was always checked (same with obtain DNS servers automatically). I have now unchecked these and put my required 192.168.1.99, with the same subnet mask 255.255.255.0 and my DNS servers 84.#.#.#). I have just set this to static to see if there are any conflicts...

2. Router is a ZyXEL P-660HW-D1. It was a free replacement from my ISP when my monoport modem died recently.

Thanks,
My System SpecsSystem Spec
23 Dec 2010   #5
jhansen965

Windows 7 profesional
 
 

Go to your router's setting and make sure the DHCP server is enabled. One of your machines has a static ip address assigned. You can change this by going to START , CONTROL PANEL , NETWORK AND INTERNET, SHARING CENTER , CHANGE ADAPTER SETTINGS, RIGHT CLICK ON LAN OR WIRED CONNECTION, CLICK PRORTIES, CLICK INTERNET PROTOCOL VERSION 4, CLICK PROPORTIES, CLICK OBTAIN IP ADDRESS AUTOMATICLY AND DO THE SAME THING FOR THE DNS SERVER OPTION. (this may be different on the windows xp machine.)
My System SpecsSystem Spec
23 Dec 2010   #6
allend66

Windows 7 Home Premium x64 OEM --> RTM clean install
 
 

@jhansen965 - yes, I've (temporarily?) put one machine as static IP because it would always fight for control over address 192.168.1.36.

Is static IP such a bad thing?? DHCP is enabled, though I don't know what it does.
My System SpecsSystem Spec
23 Dec 2010   #7
kegobeer

Windows 7 Ultimate x64 SP1
 
 

Quote   Quote: Originally Posted by allend66 View Post
@jhansen965 - yes, I've (temporarily?) put one machine as static IP because it would always fight for control over address 192.168.1.36.

Is static IP such a bad thing?? DHCP is enabled, though I don't know what it does.
DHCP: Dynamic Host Configuration Protocol - Wikipedia, the free encyclopedia

The router assigns IP addresses to any computer/device that connects to it.

Nothing is wrong with setting a static IP address. You just can't set a static IP address that is in the middle of the IP addresses your router "owns" and will assign to any computer that connects to it.

Download the manual for your router and read it. It will explain how to check DHCP. Set all of your computers to DHCP. Read this: How to enable DHCP in Windows 7? | Windows 7 Themes
My System SpecsSystem Spec
23 Dec 2010   #8
allend66

Windows 7 Home Premium x64 OEM --> RTM clean install
 
 

Quote   Quote: Originally Posted by kegobeer View Post
D'Oh! <smacks own forehead> Why didn't I think of that...

Thanks

+1
My System SpecsSystem Spec
24 Dec 2010   #9
chev65

Windows 7 Ult, Windows 8.1 Pro,
 
 

Quote   Quote: Originally Posted by allend66 View Post
Hi, didn't know whether or not to post this in the network category, but here goes...

In a nutshell - sometimes 2 machines want to have the same IP address (192.168.1.36)

My setup is: Win7 HP x64 (main rig, wired + wifi) going to a 4 port wifi router that also connects a WinXP Pro x86 (now dedicated torrenter & jukebox, wired only), and an Xbox360 (wired only).

The router's address (default gateway) is 192.168.1.1. It assigns (or Win7 assigns) IP address to my main rig, ethernet (192.168.1.33) and wifi (192.168.1.34)

Then the WinXP box will want to assign itself 192.168.1.36, the same address as the Xbox. With all machines' settings at "automatic", I find it strange and frustrating that from a pool of 255 numbers to choose from I get a conflict. (Note: this is a combined wireless/4-port router, before I had a monoport modem (192.168.1.1) and a 4 port wifi router (192.168.2.1), but no problems, IP addresses started at 192.168.2.2 upto 192.168.2.6) Question 1 - Why do addresses start at 192.168.1.33, not at 192.168.1.2?

Now, I've already gone into the Xbox settings and instead of "automatic", I've selected "custom" and I've even input the same numbers (IP address, default gateway, DNS servers, submask) as the auto but it doesn't connect to Xbox Live!. Ok - I reset it to auto - fine.

Question 2 - I assume I can demand the WinXP to always use, for example, 192.168.1.99, leaving 192.168.1.36 for the Xbox? HOW? The problem only seems to happen if I turn something on after the others are booted and stable, typically both PCs are running, I boot the Xbox for a bit of gameage, the Xbox will rob the WinXP address and then I get the yellow exclamation triangle in the WinXP tray telling of a conflict of IP addresses.

Thank you for patience and help!
D
Lots of confusing statements in your first paragraph which I highlighted in bold.

You say that you have Win7 machine going to your router?

This is a very confusing statement as the correct set up should be modem>router>Win7 machine and other machines or switch not the other way around. You can't have the Win7 machine before the modem or router.

You don't need to use static IP's for this set up. It will work fine using DHCP provided that everything is connected in the correct order.
My System SpecsSystem Spec
24 Dec 2010   #10
PooMan UK

Windows 7 Ultimate 64bit
 
 

Alternatively you could assign the IP address in the router settings via the MAC address of each device, this way you would be guaranteed that each device would obtain an IP address that you decide before hand.
To find out the MAC address of your PC's open cmd and type ipconfig /all (see pic)
To find out the MAC address of your Xbox goto the advanced settings or look on the back of the unit (there should be a sticker) (see pic)
Once you have these just logo onto your router and under the LAN TCP/IP Setup you should be able to reserve the addresses you want. (see pic)

Your router settings will differ from mine but the concept is the same on most routers



Attached Thumbnails
-tcpip-setup.png   -address-reservation.png  
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