2 net works

March 22, 2010 at 01:54:45
Specs: Windows 7
Hi all, and thanks for the help in advance here is my problem

I have 2 net works; each one of them connected to a DSL modem router and has Internet access, I have 4 PC's each 2 connected to one of these networks, what I want is, 1 PC to be connected to the both networks, so that I can share my files in both networks and I want this PC to connect to an internet as well.

The PC comes with 2 Ethernet connections built in the motherboard, and the PC is using windows 7, I tried many ways and did not work,
Please can someone help me?

Thank you so much


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#1
March 22, 2010 at 08:19:53
First, ensure both onboard NIC's are enabled in the BIOS. Once they are, then you should be able to connect one NIC to each nettwork using DHCP.

Do you have a SOHO router running DHCP on each network?


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#2
March 22, 2010 at 09:18:45
thank u so much dear sir for your reply,

yes both network using DHCP as they get it from the DSL router modem.

and i will check about the NIC in the bio's now and reply,
thank u again


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#3
March 22, 2010 at 09:46:42
If you're using the default IP addressing scheme on both networks your problem may be that both are using the same subnet.

Open a command prompt window (ie: Start >> Run >> type cmd and hit Enter) on one PC in each network and type the following command:

ipconfig /all

Compare the output. If both networks are using the same subnet, you'll need to change one of them.

I can help you with figuring out if they're in the same subnet or not if you can't tell. All you have to do is post the Default Gateway IP from both computers and the Subnet Mask and I'll be able to tell.


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#4
March 22, 2010 at 11:10:21
thank u sir, i compared both of them, and yes both of them same in default gateway and in the subnet mask.
any recommandation please?
thank u so much for ur help

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#5
March 22, 2010 at 12:28:14
thank u sir, i compared both of them, and yes both of them same in default gateway and in the subnet mask.

Ok, that's going to be your problem. Basically, you have the exact same subnet on two separate subnets. If you try to connect two NIC's on PC, one to each, you end up with IP's in the same subnet and you'll only ever connect to one network, if you even get to connect to one.

I would suggest you change the LAN IP addressing scheme of one network or the other to a completely different subnet. Then you shouldn't have any trouble connecting to both at the same time with different NIC's on one PC.

Since you didn't post the default gateway IP's as I asked, I'll give you a rough idea.

The typical default subnet on most SOHO Router's that I've worked with is either: 192.168.0.0/24, or 192.168.1.0/24

If for example, both of yours are 192.168.0.0/24, change the LAN side of the other router to 192.168.1.0/24

Now, with both NIC's on your PC set to DHCP, each will get an IP address that isn't the same subnet and you'll be able to communicate with both networks.


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#6
March 22, 2010 at 12:36:27
sorry the default gateway is 192.168.1.1 on both of them,
so now i need to change one of them to be 192.168.0.1 right?

i have a question please. since the both networks has different internet access, which one the PC will use? can i chose?
thank u so much really for ur help


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#7
March 22, 2010 at 15:15:49
sorry the default gateway is 192.168.1.1 on both of them, so now i need to change one of them to be 192.168.0.1 right?

You do need to change one networks subnet yes.

i have a question please. since the both networks has different internet access, which one the PC will use? can i chose? thank u so much really for ur help

Decide which interface (network/subnet) you want to use for your internet.

For the one you don't want to use as your internet connection, statically assign and IP address that is not in the DHCP Scope. (The default on most SOHO Routers is to have a scope like the following: 192.168.x.100 to 192.168.x.199 but you want to check the scope settings on the appropriate router to ensure you pick an IP not in the scope to avoid a duplicate IP) When statically assigning an IP, do put in the correct subnet mask but if you leave out the default gateway address, it will not have internet access, only LAN access.


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#8
March 22, 2010 at 22:27:08
really thank u so much for your time, this helped me a lot, thanks sir.

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