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Old 08-23-2007, 04:44 PM   #1
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Default 2 Computers on a network and then suddenly different addresses

Hope someone can help with this. I have two computers on a home network. Both can see the internet but they cannot see each other (which is a bummer as we run a business using them and need to share data and do backups etc..

Running ipconfig/all on both I get that one has the IP address of 192.168.1.101 and the other has 192.168.102.100 Both have the same subnet mask of 255.255.255.0

My question is how do I alter the IP addresses so that they can see each other again and which one do I alter?? (I'm assuming that is the reason for this.)

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Old 08-23-2007, 05:54 PM   #2
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Default Re: 2 Computers on a network and then suddenly different addresses

its probably just a firewall running on either on of the computers, even windows firewall will block out another computer
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Old 08-23-2007, 10:01 PM   #3
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Default Re: 2 Computers on a network and then suddenly different addresses

OK, so at the risk of appearing dumb, what do I do about it?

Thanks
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Old 08-24-2007, 06:49 AM   #4
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Default Re: 2 Computers on a network and then suddenly different addresses

well for example in zone alarm you click on firewall>zones, and then make sure the other computers ip is there as being "trusted". id also run the windows home network setup.
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Old 08-24-2007, 06:29 PM   #5
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Default Re: 2 Computers on a network and then suddenly different addresses

If I run the network setup wizard it does nothing at all... It won't / can't change anything.

If I look at the firewall setup in the control panel I see nothing to do what you said.

Is there simply some way of changing the IP address of one of the computers to something which will allow the other to recognize it's on the same network??
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Old 08-24-2007, 06:46 PM   #6
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Default Re: 2 Computers on a network and then suddenly different addresses

network connections>choose your card, right click>properties. go right to the bottom to internet protocol tcp/ip
then input the stuff in there
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Old 08-24-2007, 09:45 PM   #7
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Default Re: 2 Computers on a network and then suddenly different addresses

Do you even have file/printer sharing enabled? I may be wrong, but I think that's disabled by default unless you have more than one user.

Also, make sure they are both on the same workgroup. If they are on different workgroups, then they will not see eachother to share files and printers.

Quick way to check all of that, is to run the network connection wizard.
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Old 08-25-2007, 05:19 AM   #8
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Default Re: 2 Computers on a network and then suddenly different addresses

This has nothing to do with a firewall etc, the reason they cant see each other is because they are on different subnets, notice how the third block of numbers on each computer is different here, 192.168.1.101 and the other has 192.168.102.100. You need to change the third set of numbers on one of the computers. For example, change them to 192.168.1.101 and 192.168.1.102 respectively.

This can be done from the network settings, alternatively you could enable DHCP and let the computer setup them for you.
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Old 08-25-2007, 08:42 AM   #9
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Default Re: 2 Computers on a network and then suddenly different addresses

^^Great catch. I did not notice that.
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Old 08-25-2007, 08:49 AM   #10
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Default Re: 2 Computers on a network and then suddenly different addresses

Quote:
192.168.1.101 and the other has 192.168.102.100
I thought someone would have caught that sooner. I bet hes running static ip addresses instead of using dhcp either way works.
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Old 08-25-2007, 02:09 PM   #11
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Default Re: 2 Computers on a network and then suddenly different addresses

Actually, I can't seem to alter the numbers. If I try, it reverts back to the ones I posted earlier.
DHCP is enabled and it doesn't seem to make any difference.

Any specific thoughts / actions?

The only thing I can think of which might have something to do with it (or not) is that I had a new Motorola modem (SR5101) recently to replace my old and ailing D-Link. It was round that time that things went yucky, but I can't be sure about the definite link to this replacement and the networking problems.
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Old 08-25-2007, 04:21 PM   #12
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Default Re: 2 Computers on a network and then suddenly different addresses

Quote:
Originally Posted by 0x0161 View Post
I thought someone would have caught that sooner. I bet hes running static ip addresses instead of using dhcp either way works.
Yep, i thought so too

Change from DHCP and set them manually on both computers then, static addresses will be fine. Some more info might be good if you would prefer to setup DHCP tho. If you goto start > run > type cmd > and then enter ipconfig and press enter on both computers and post the results then we can probably help more.
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Old 08-25-2007, 08:01 PM   #13
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Default Re: 2 Computers on a network and then suddenly different addresses

Computer 1 has
IP address 192.168.102.100
Subnet 255.255.255.0
Default Gateway 192.168.102.1

Computer 2 has
IP address 192.168.1.101
Subnet 255.255.255.0
Default Gateway 192.168.1.1

On the admin of the Linksys router the setup page has
Local IP address 192.168.1.1
Subnet mask 255.255.255.0
Local DHCP Server Enabled
Start IP address 192.168.1.100 (with the last group being editable)
Number of addresses 50 (editable)
DHCP Address range 192.168.1.100 to 192.168.1.149
Client Lease time 0 minutes (0 means one day)

Thanks for helping with this

I've tried disabling and then re-enabling the connection but not much more than that
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Old 08-25-2007, 11:48 PM   #14
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Default Re: 2 Computers on a network and then suddenly different addresses

Are they hooked up to the same router? Looking at the default gateways, I 'd say you aren't....
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Old 08-26-2007, 02:35 AM   #15
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Default Re: 2 Computers on a network and then suddenly different addresses

As celegorm said, the default gateways should be the same, this would normally be the routers IP address. Im guessing you only have the one router, so if you have then change computer 1s gateway.
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Old 08-26-2007, 11:00 AM   #16
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Default Re: 2 Computers on a network and then suddenly different addresses

They're on the same router.

It's driving me crazy!
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Old 08-26-2007, 11:27 AM   #17
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Default Re: 2 Computers on a network and then suddenly different addresses

Of course, it's on the same router. However, you're using 'static' IP address setup for this network. You need to go into the TCP/IP Properties of either your *local area connection* or *wireless network connection* and correct this. Either have the router act as the DHCP server or manually assign IP addresses to the computers on your network,either way works.

for example, 192.168.1.102 192.168.1.103 etc...

also, to share properly youmight want to make sure

client for microsoft networks

file and pritner sharing for microsoft networks

and having the same *workgroup name*


if you want join an Active directory domain, you need at least one domain controller and one DNS server online and available.

cheers,0x0161
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Old 08-26-2007, 12:50 PM   #18
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Default Re: 2 Computers on a network and then suddenly different addresses

Ok so if I look at the TCP/IP Properties of my Local Area Connection I see that it is set to obtain an IP address automatically and to obtain a DNS server address automatically. The items you listed are also correct.

So, if I'm reading these posts correctly, what you're saying is as follows:

1 Go to router and disable DHCP server.
2 Change the Default gateway on Computer 1 to something like 192.168.1.102 (Do I do this using the router interface or using the TCP/IP properties of Local Area Connection?)
3 Make sure that the Local Area Connection properties do NOT obtain an IP address or a DNS server address automatically
4 What do I do about the IP address on Computer 1? Set that to the same as the Default Gateway in step 2 above?

What have I missed here?
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Old 08-26-2007, 12:55 PM   #19
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Default Re: 2 Computers on a network and then suddenly different addresses

Quote:
what you're saying is as follows:

1 Go to router and disable DHCP server.
2 Change the Default gateway on Computer 1 to something like 192.168.1.102 (Do I do this using the router interface or using the TCP/IP properties of Local Area Connection?)
3 Make sure that the Local Area Connection properties do NOT obtain an IP address or a DNS server address automatically
4 What do I do about the IP address on Computer 1? Set that to the same as the Default Gateway in step 2 above?

What have I missed here?
IM not saying log into the router and disable the DHCP part.

2.) Leave the default gateway the way it is

just go to the tcp/ip properties of the pc(s) with the OFF IP addresses to correct problem. The router has nothing to do with this because these are manually assigned in the TCP/IP properties.
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Old 08-26-2007, 08:53 PM   #20
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Default Re: 2 Computers on a network and then suddenly different addresses

Well, I tried just altering the tcp/ip properties of computer 1 to 192.168.1.102 and then I couldn't access the internet anymore. So I reset it to what it was again.

Did I miss out something?
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