2 Subnets Network Communication Help...

June 12, 2012 at 07:45:32
Specs: Windows XP Pro SP2
I have these two different subnet networks that are connected with a Cat5e cable. I want the computers on network A to see the computers on Network B and viceversa. NO internet requirements just network communication. I read a procedure from a contributor here Curt R but I don't know if that applies to what I want to accomplish.

Network A has a router in it that is used to manage wireless connectivity and internet connectivity to a selected group of computers.

Network B is just wired to an unmanaged switch that is part of network A


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#1
June 12, 2012 at 07:57:26
Yes, it does apply.

I want the computers on network A to see the computers on Network B and viceversa.

If you want communication back and forth between Subnet A and Subnet B, creating a second, separate subnet is a moot point and you should just use a single subnet and completely forget about the 2nd router altogether.

Reread my guide and pay attention to the version (I believe it's version 1) wherein you interconnect the routers "LAN port to LAN port"

IMHO you're overcomplicating this by introducing a second subnet. KISS (Keep It Simple Stupid) is a good rule of thumb to live by in computing and in this case you're not doing it (ie: keeping it simple)

If you feel you absolutely have to have a second, separate subnet, please explain your logic and reasoning. I confess I'm rather curious about that.

Oh and if you have to have a second subnet, my guide still does apply, only you'd use the other version wherein you interconnect "LAN port to WAN port"

I made that guide to help out people like you so if you're having issues understanding it, there's not much more I, or anybody else, will be able to do.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#2
June 12, 2012 at 08:09:42
I have a piece of software that I configure in such a way that it can see which equipments are attach and online on network 199.199.xxx.xxx. I can also get information from those equipment through the network.

The network on 192.168.xxx.xxx is now wired into network 199.199.xxx.xxx. If I add a router I have (DLink DIR-655) between network 199.199.xxx.xxx and network 192.168.xxx.xxx by connecting them on the LAN side of the router I could follow your instructions Curt R and get the communication to work.

I don't need to create any type of "Static Routing" or anything like that. Router 1 doesn't have DHCP enable, FYI. It's all static IP addressing.


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#3
June 12, 2012 at 09:51:26
"by connecting them on the LAN side of the router"

that accomplishes nothing. no routing which you need to go between subnets.

why don't you want to use a single subnet?
you can easily change the 192.168.x.x to 199.199.x.x

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#4
June 12, 2012 at 10:25:11
After doing the connections as instructed I realize that it didn't work because I was trying to Ping on of those CPU on network 192.168.xxx.xxx and I wouldn't get any response.

This is a production facility, and the machines in question are automated equipment that vendors already have them set up with that IP address structure.

Changing will require interrupting production which I can't afford, that's why I'm trying to route communication from network 192.168.xxx.xxx to 199.199.xxx.xxx so I can go into this machines PLC's and do monitoring, editing, etc.

How can I do the routing, Wanderer. Could you please help me.


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#5
June 12, 2012 at 10:56:41
What is the reason you can't change the 192.168.x.x network to the 199.199.x.x network. Then the two would be on the same network.

Otherwise you need a router between the subnets with one lan going in the lan port and the other lan going into the wan port.

Some routers have a "gateway" setting that makes it a router between subnets instead of between lan and internet.

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#6
June 12, 2012 at 11:14:44
If I change those IP addresses when OEM integrators come in to work on the equipment they service for ustThat will disrupt the abillity to do so. This IP addresses are use for various equipment to exchange infromation so they can work in sequence. I will have to shutdown the facility to change everyone of them addresses.

Is just to complicated Wanderer. That's how a have it connected 199.199.xxx.xxx connected to a WAN port on router 2 and 192.168.xxx.xxx connected to LAN port on router 2.

I want to make sure that I can communicate in both directions.


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#7
June 12, 2012 at 14:53:52
I would have planned the network so the equipment has static but anyone visiting would have gotten dhcp ips. This way the "tech" would easily get the correct ip to do their job.

I would also not be using public ip 199.199... on the lan. That can cause problems if there is ever the need for internet access.

Given your situation adding a router is your only choice. I would suggest doing some planning and redo your ip plan. Otherwise this isn't the first bug you are going to be running into.

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#8
June 12, 2012 at 15:06:40
Thank you for your suggestion. I didn't put this network together by the way, I just joint the company and all this IT infrastructure was already in place. All I can do is work with what I have.

I already added the router and I connected one LAN port to Network A and another LAN port to Network B. I also went to the "Routing" menu and created two static routes, this is an example of one of them.

Destination IP: 192.168.1.xx
Gateway: 199.199.199.xx
Netmask: 255.255.255.0
Metric: 1
Interface: LAN

After I did this I was trying to ping 192 address to confirm if it works but I wouldn't get any response.


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#9
June 12, 2012 at 15:47:00
You should not need a static route.

You assgined 199.199.x.y on on the wan interface and 192.168.x.y on the lan interface or visa versa?

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#10
June 13, 2012 at 05:35:43
I did this for the WAN side,

IP: 199.199.199.xxx
Mask: 255.255.255.0
Gateway: 199.199.199.xxx

and this for the LAN side,

IP: 192.168.1.xxx
Mask: 255.255.255.0

But I'm not able to ping anyone of the IP addresses on the 192.168.1.xxx network


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#11
June 13, 2012 at 07:51:39
Ok, it looks like you have set the second router up correctly. Devices connected to it's LAN side should have internet connectivity. Is this correct?

If it is, then all you should need to do at this point to establish communication in the other direction is add a static route on router 2 from the 199.999.x.x network to the 192.168.x.x network.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#12
June 13, 2012 at 07:56:45
I connected my laptop to one of the LAN ports on the DLink router and I couldn't get internet to work.

The static route goes from gateway on 199 network to gateway on 192 network, correct.


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#13
June 13, 2012 at 09:04:51
where is the gateway entry on the lan side in post #10?

if doing static routes you would need to do them both ways not just one.

the present router may not work for you.

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#14
June 13, 2012 at 10:54:27
I was looking at the current router and on the LAN configuration it doesn't give me the ability to add the Gateway Address to the LAN port.

What router do you think I should use? or do you have another option suggestion besides the router?


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#15
June 13, 2012 at 11:25:14
Not seeing gateway services as a feature for that Dlink.

You have no choice. You need a router. I would suggest a Cisco PIX. You can pick up a used one pretty cheaply these days.

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#16
June 13, 2012 at 11:31:50
I see the gateway feature, when configuring the WAN but not to configure the LAN. The only options on the LAN setup is IP address and Subnet Mask.

Is the (CISCO PIX-515E-R-BUN 32mb Dram 16mb Flash) a good choice.


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#17
June 21, 2012 at 08:08:26
Pix specs look good

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#18
June 21, 2012 at 15:20:06
If I buy this CISCO PIX-515E you will guarantee me a better performance because right now I'm getting spotty connections.

I'm losing connection to the devices I need to talk too very frequently and it makes my job difficult to do.


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#19
June 21, 2012 at 16:02:12
What do you mean by spotty connections?
can you give some examples?

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#20
June 21, 2012 at 16:35:17
I have a software on my computer that scans the network and a graphical display shows me which devices are responding to its request to report connection.

When a device responds, the software shows an icon that represents the device presence in the network. When a device doesn't respond or connections is intermittent, the software shows the icon but with a big red "X" representing l"Loss of Connection"

When I'm looking at the programming code running on the CPU of these network devices,I can observe the execution of it "Real Time" but if the device loses connectivity to the network, the software I'm using to view the program kicks me out of the "Real-Time" environment and I have to start all over again.


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#21
June 22, 2012 at 14:19:10
Wanderer,

I bought the CISCO PIX-515E unit and I should be receiving it next week. Can you help me configure it to open a VPN tunnel to access the network I have at work through the internet from my home.


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