How to configure routing to different subnet

If it's not on a VLAN, communication between the Servers/PC/phones are "open". Just change all IP configuration to subnet mask 255.255.0.0 and they will be able to communicate without a problem.

You can add alias IP addresses on any Windows OS
So, the easiest way: on the computer where is TeamViewer installed, make an alias IP where you add an IP address from telephony system; in that way that computer will be in both subnets

Best regards!

IN fact you can add alias IP's in any OS. So for one physical NIC you can have many IP addresses (virtual IP address)

If you use a DHCP server, it's easier to change only the mask. If you only need a few PC's, then adding the extrra IP address is also an option (change IP on each PC manually)

Kimputer: I would not like to have a big extranet with workstations mixed with telephony system, for security reasons and for broadcast traffic to be at a lowest possible level ... I think that he wants that  from only one station to access the telephony system ... my guess, no offense!

Best regards

matrix8086. Yes, I really only need the external support team to have access to the one device. As I mentioned, they use TeamViewer to connect to the company network and then use IE to hop onto the Mitel box. The fact that they use TeamViewer means that they can be allocated any PC that's free at the time so I would like all PCs to be able to access it.

If ALL PC's need this configuration, it's faster to change the subnet mask at the DHCP server.

I could change it to 255.255.254.0 ?

If you think it's that big of an issue, sure, limit the subnet, but do it with 255.255.252.0

I have set my server settings as:
IP: 192.168.0.3
Subnet mask: 255.255.252.0
Default Gateway: 192.168.0.1
Preferred DNS: 192.168.0.3
Alternate DNS: 8.8.8.8

However, I still can't contact the Mitel box on 192.168.1.2

the mask 255.255.254.0 make extranets from 192.168.0.0 to 192.168.1.254, from 192.168.2.0 to 192.168.3.254, etc

the mask 255.255.252.0 make extranets from 192.168.0.0 to 192.168.3.254, from 192.168.4.0 to 192.168.7.254, etc

You should check if the Mitel box have also the mask 255.255.252.0. If the Mitel box have the mask 255.255.255.0, you cannot access it from a workstation.

Also, the ip telephony system and the workstations has to be connected in the same switches. If the 2 systems have different switches, you need to configure a route in the gateway (if they are connected to the same one ..)

But, I have already mentioned:  I would not make an extranet from workstation and IP telephony because of security reason and broadcast traffic

To help you further, I need to know the physical connection architecture go the two systems ...

As a conclusion: Mitel box has to be connected in the same switch, or in the same router with the server 192.168.0.1

Does your network allow traffic between the two subnets? Is everything on one internet connection, or is everything literally separated, even from the physical side of things? You need to provide more information to allow for good answers to be provided.

The devices are on the LAN and are connected to the same switch. From a LAN device on 192.168.0.3 I am unable to make a connection to 192.168.1.2
A agree, more information will provide better answers but I as I don't know the answer then I don't really know what information to provide

can you ping from 192.168.0.3 to 192.168.1.2? If the answer is no:

- what is the net mask of 192.168.0.3 and 192.168.1.2?
- what is the default gateway for each of those two?

No, I can't ping from 192.168.0.3 to 192.168.1.2 and I'm going to follow up your previous post where you said the subnet mask must be the same on the Mitel box. I will need to visit site to check this but won't be able to do this until Tuesday after the UK bank holiday is over. At the moment I can only check the details of the PC I'm working on.

Chances are your switch does not allow communication between the two subnets. You will need to configure the switch to allow interLAN communication or put a computer in the phone LAN for support to access from outside and use it to access the phone system. I would more likely advise the latter, as it prevents the need to allow communication between the two subnets. L

Can I ask why TeamViewer is not installed directly to the Mitel box?????  Why they can't access the Mitel box from a specific station designated in the organization by you.

The easy way will be to install the software on the Mitel box.

VOIP phones do not support Teamviewer.

So the Mitel system run on what??????

SIP firmware (as that's all the basics a VOIP phone needs)

what mitel system do you have?  I'll find out with my provider!!

Are you referring to getting the phones to run Teamviewer? That would make as much sense as getting my old Nokia 5160 moble phone to run Teamviewer (yes the brick sized ones, with the only function being, calling).

No... your system has to be controlled by a PC, running your voice mail, settings, names on the phones, etc. that computer....

That's a good question, I assumed asker needed to configure the phone itself, not the phone system itself. The asker still has to report back (fixing network mask, which would still be needed if the phone system was to be remote controlled directly through the internet anyway), so it's not a wasted step.

Sorry I thought I was talking to the "Author"!!!

I'll wait!!

Got the telephony guy visiting next week to check the IP address of the Mitel box. I'm convinced it's not as he thinks it is because even when I set a PC to the same subnet as it's supposed to be on I still can't contact it.
I'll update when I get more details and confirmation of what I dealing with.

That would make a big difference... thanks for the update!

Support engineer configured a static route after visiting site.
Unfortunately I wasn't given the true facts when I posted the question and if I had been told that it had been configured on a VLAN then I think the answer would have been forthcoming (Kimputer's first post referred to VLANs).
Thanks to all who contributed.