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Windows 7: IP changing

15 Aug 2011   #1

Windows 7 Ultimate 32bit
 
 
IP changing

Hello

I have a problem with a network so if you could help I will be grateful.

I have a network witch has the IP 20.1.1.x, 20.1.2.x, 20.1.3.x. For a few day some of the computers receive another IP (192.168.1.x). We are using here swithches, routers...

Could you tell me what is the problem?

(Sorry for my english)

My System SpecsSystem Spec
15 Aug 2011   #2

Windows 7 x64 pro/ Windows 7 x86 Pro/ XP SP3 x86
 
 

Well I can see only 2 ways this would happen. Either your DHCP server is handing out ip addresses in the 192.. range (check in the router settings) or the computers are obtaining ip from another device other than the intended device. Unless the no. of computers is very large, you can also try assigning ip addresses manually in the 20.. range.
My System SpecsSystem Spec
16 Aug 2011   #3

Windows 7 Ultimate 32bit
 
 

Until 2 weeks ago everything worked just fine.
I already assigned the IP manually on the computers that have that problem, but this is only a temporary solution, because the number of the computer is large and it's not an option.

Somebody told me that maybe the output of a router could be connected to the output of another router. Could this be the problem?
My System SpecsSystem Spec
.


16 Aug 2011   #4

Windows 7 x64 pro/ Windows 7 x86 Pro/ XP SP3 x86
 
 

If you have multiple routers you need to make sure only one is assigning ip addresses, so switch off dhcp serve on the other. If the second router is connected via CAT5 cable, it must be a lan port to lan port connection with the mother router. Basically the second router should just act as a device for the mother router.
My System SpecsSystem Spec
16 Aug 2011   #5

Windows 7 Ultimate 32bit
 
 

A switch could cause a problem like that? Or only a router?
Because I have here many swithches (3COM, Cisco, Trendnet; 8 ports, 24 ports, 48 ports).
My System SpecsSystem Spec
16 Aug 2011   #6

Windows 7 Ultimate X64 SP1
 
 

If it's a home (or small business for that matter) network, check this out: Multi Router Network - Configure It may point you to where you've gone wrong.

Generally speaking it's best to only have one DCHP server on a network, unless you have a bit system and you don't have enough IP's to go around. I agree with Bills assesment, that another router is handing out IP's when it shouldn't be.
My System SpecsSystem Spec
16 Aug 2011   #7

Windows 7 x64 pro/ Windows 7 x86 Pro/ XP SP3 x86
 
 

Quote   Quote: Originally Posted by Bogd4n View Post
A switch could cause a problem like that? Or only a router?
Because I have here many swithches (3COM, Cisco, Trendnet; 8 ports, 24 ports, 48 ports).
A switch doesnt require any ip address or dhcp configuration so it does greatly simplify things.

So are there different subnetworks here or just one large network? And wired/wireless/hybrid?
My System SpecsSystem Spec
16 Aug 2011   #8

Windows 7 Ultimate 32bit
 
 

I didn't create and configure the network. It was already created when I get here and it's pretty big. There are also here 6 Access points (these are working as routers, right?).

Than you guys. I will read that tutorial.
My System SpecsSystem Spec
16 Aug 2011   #9

Windows 7 Ultimate 32bit
 
 

There is one big network witch has access to Internet. Most of computers use the wired connection, and the wirelles is used only by a few laptops, sometimes. There are 6 access points for wireless coverage.
My System SpecsSystem Spec
16 Aug 2011   #10

Windows 7 Ultimate X64 SP1
 
 

Actually, what would make this process much quicker, rather than trying to figure out which router is to blame manually, is this.

From a machine that has the "wrong" ip address (ie 192.*) open command prompt and type ipconfig /all and post back the results.

If you could do the same to one that is on the "right" network as well that would make things much easier....
My System SpecsSystem Spec
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 IP changing





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