Connecting 2 RV042 to different subnet and DSL connections

Small office, 2 RV042, 2 DSL connections. 1 is used striclty for the business side, and the other is for our CCTV network. They also have seperate DSL connections as we have 2 external IP address for clients to connect remotely. We don't want to take away our exisring setup, but would like to bridge both networks so a few of our internal clients can connect to our CCTV network and use some of the devices. Right now they come in on VPN but its not as fast.
Is this doable without adding additional hardware? Both networks need DHCP enable as well.
Breakdown:
DSL 1
|
RV042
|
192.168.20.X
|
| Would like to somehow join the 2 networks together.
|
DSL 2
|
RV042
|
192.168.40.X

Hi Matt, you may utilize 1 RV042 router and host the dual wan for each connection then bind the appropriate services to the WAN. You then may enable the multiple subnet feature on the router to allow both separate LAN IP network communication through the LAN.
Next you can make very specific firewall rules for the specific services.
The caveat of this router firewall is that it has a default state table. To bypass the default state table you will need to make such a deny all rule for every field.
Then make a service rule to permit source ip to destination IP using which WAN for what service. (Confusing isn't it?)
Reference this topic to get an idea what I'm talking about.
https://supportforums.cisco.com/message/3828616#3828616
-Tom
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