Connecting two networks with different IP Ranges

[Killswitch67]

Hi Folks,

I have two companies that occupy the same building.

Company 1 has a High speed dedicated line connected to a Cisco Router,(891 ISR). The internal network consists of around 5 PC's , workstations. The high speed line is used to provide a fast upload speed for MRI scans. It also provides access to the internet for company one. The ip range for company one is 10.88.10.x . DCHP is handled by the cisco router. Router IP is 10.88.10.161

Company two has around 45 client PC's connected to an HP pro-curve router/s. Company 2 has an Ip Range of 192.168.0.x . The internet access is provided by a simple Netgear 834 ADSL Router ,(Ridiculous I know), This will be upgraded soon to a Cisco 891 ISR. However I would like to focus on what we have now as opposed to the future. Company 2 also has a Primary Domain Controller based on SBS 2003 platform. This server runs DHCP for company 2 network only. A second/member server,(Xray Server), has been added to company 2. This server will act as a repository for a new elctronic Xray system that is being installed. This server has to be connected to company 2 network in order that the Xray system client PC which manages the Xray process can connect to it and upload Xrays to it. The server will also be expected to then forward these xray's to a central database located offsite.

Heres the problem:
I need the Xray server to be able to connect to the high speed dedicated line that is present in Company 1. So far I have physically connected and Cat 5e cable between the FastEthernet 8 port, (FE8) on Company 1 Cisco router and the HP proCurve switch in Company 2. I have used Putty to log into the Cisco on company 1 and configured FE8 interface with an ip 192.168.0.235 subnet 24. I am now able to ping the router interface IP from any system within company one or company 2. However, I can ping nothing else inside company 1 from company 2. Obviously I would like the Xray server,(192.168.0.x) to be able to send data to the Cisco router,(10.88.10.161) so that we can avail of the high speed line.

I should point out that after reading several articles on line I see that some people are suggesting that I change the gateway information in the sending system(Xray Server), to match the interface IP address on the Cisco FE8 Port(192.168.0.235). However, if I do this then the Xray Server will surely loose internet access via the current router,(netgear 834, 192.168.0.250). or can we have 2 gateways, one for the inter-network connection and one for the internet connection??

Also, if I do manage to establish a connection between the two networks will this cause problem with the two DHCP services on either network as you are only meant to have one DHCP device on a network.

Apologies for the long winded explanation but I wanted to give as much information as possible.

Many Thanks in advance

 

[unclerico]

You need a route in your company 2 gateway pointing to 192.168.0.235 as the next-hop to reach network 10.88.10/24

As for DHCP, as long as the 891 has a dhcp scope configured for the 10 net and not for the 192 net and vice versa you don't need to worry about it.

 

[Killswitch67]

Hi Unclerico

Many Thanks, I have now setup a static route and can indeed ping across the networks. However, I probably need to do some work on the Zone Based Firewall to all traffic arriving at port 192.168.0.235 to continue out via the cisco router onto the internet via the WAN port.

Thanks again..