Join Two Networks

lukestclair55 used Ask the Experts™

I have a little problem.

I have a network with ip addresses of 172.16.168.*

I have a couple of devices within the 192.168.0.* range of ip address which I cannot change the ip addresses on. Phone systems, etc.

Can anyone advise how I can get the network ip addresses talking to each other?
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I think we will need a little more information.  Are these subnets on the same physical lines?  Are they in separate buildings?  Are they VLAN? Do you have a firewall?  what are the current gateway configs. do you have any routing rules in place...  The questions are endless.

Please elaborate on what equipment you have and how you currently have it configured.

(i.e.  I have a 12 port switch with 2 VLANS (subnets 172.16.168.x and 192.168.0.x)
I have two firewalls, one controlling subnet 172.16.168.x and other 192.168.0.x )




Okay, sorry,

I have one network within the same building.


I have a firewall router with an ip of that details with virus protection and web browsing, etc.

One vpn router that allows remote access from the outside on an ad-hoc basis to the resources on 172.16.168.*.

The default gateway is
Add a simple router that connects the two subnets.  And add a route on the gateway router(s) that points to the added router.

Route / 16 (if that's the right mask) to the appropriate port on the router.  The one that's connected to
Route / 24 to the appropriate port on the router.  The one that's connected to

Without knowing the network topology it's hard to go any further and there well may be issues that aren't evident.  What *is* the network configuration?
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Have you considered changing the IP addresses of the nodes you can change to match the ones you can't?
As I understand you have L2 switches in a building and two different ranges on the switches.

What router are you using?!
If you are using cisco, you can configure a secondary IP to the LAN interface.

More info here:
Search for:  "Assign Multiple IP Addresses to Network Interfaces"
Have you found a solution to this?  If so, please let us know what the resolution was .



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