Networking & Wireless forum

Question

Router Config: 2 WANs, 2 Lans, need communication between

by ecobrett / April 26, 2018 6:12 AM PDT

Hi I've been trying to work this one out for a while with no success. This setup is in a 2-story house with 2 WAN connections each at opposite ends of the house.
Downstairs:
Router ActionTec T3200- IP 192.168.254.254 Subnet 255.255.???.0
DHCP: Required

Upstairs:
Router ActionTec T3200- IP 192.168.1.254 Subnet 255.255.???.0
DHCP: Required

Goal:
Allow a home automation hub to connect to devices on both networks.

These T3200 routers don't seem to allow static routes to be configured so is this setup impossible even with the addition of a more advanced router on the network. Replacing both T3200s which provide bonded dsl connections is not an option.

I was imagining that an advanced router with the automation hub on another subnet, 192.168.50.0 for example, might be possible but now I'm having doubts. Thanks for any advice!

Answer This Ask For Clarification
Discussion is locked
You are posting a reply to: Router Config: 2 WANs, 2 Lans, need communication between
The posting of advertisements, profanity, or personal attacks is prohibited. Please refer to our CNET Forums policies for details. All submitted content is subject to our Terms of Use.
Track this discussion and email me when there are updates

If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.

You are reporting the following post: Router Config: 2 WANs, 2 Lans, need communication between
This post has been flagged and will be reviewed by our staff. Thank you for helping us maintain CNET's great community.
Sorry, there was a problem flagging this post. Please try again now or at a later time.
If you believe this post is offensive or violates the CNET Forums' Usage policies, you can report it below (this will not automatically remove the post). Once reported, our moderators will be notified and the post will be reviewed.

All Answers

Collapse -
Answer
You are battling what is called....
by R. Proffitt Forum moderator / April 26, 2018 8:15 AM PDT

"Non routable IP ranges" is covered at https://en.wikipedia.org/wiki/Private_network

This is why you can't fix this with routing tables. I have run into folk that can't believe this and you give them time to ponder.

If you want to join the two networks to make a LAN, then you look into VPN solutions. But that's beyond the scope of what I'll discuss here. I may point to the VPN solution but setup must be done by the person that is going to care and support the system.

Again, the routers must support this so changes in hardware is not unusual.

Collapse -
Router Config: 2 WANs, 2 Lans....clarification
by ecobrett / April 26, 2018 9:31 AM PDT

Thanks so much for your response! There's one piece of info I failed to mention. I can connect the two LANs locally, so most of the home automation traffic would stay local. However upstairs I would still want to use the upstairs WAN for internet and downstairs I would want to use the downstairs WAN. Would that still necessitate a VPN? Thanks again!

Collapse -
If the LAN is connected locally.
by R. Proffitt Forum moderator / April 26, 2018 9:54 AM PDT

Then we only need to change the netmask to add addressable space so I can ping the other IP.

If the connection is over a router with two ISPs and such it is not a local connection and you fall into the non-routable IP issue. The WAN is not local and we are back to a VPN to make it so it's like we are on the other LAN.

But both LANs at the same time? A redesign would be required to bring the LANs under the same LAN. Or something entirely different than a VPN. If you can remote to a PC or such on the other LAN then you can control what ever the thing is on that PC.

Confusing at first, but at some point it will become clear that we can't route our way around this one. That is, from the above it looks like VPN or remote into a PC on the other LAN to do the controls.

--> And then we have one more (advanced to most) solution. It's to create an automation server (this is what you see in those home automation hubs) which does expose itself to the internet where a command is received and replied to the Internet and locally it talks to the smart light switch or such.

Note: Edited for grammar.

Post was last edited on April 26, 2018 9:57 AM PDT

Collapse -
Router Magic
by ecobrett / April 26, 2018 12:33 PM PDT

Thanks again for the response. You inspired me to try something new that to my extreme surprise seems to work. So as I mentioned in my most recent message I wanted to communicate between LANs but continue to use respective internet connections upstairs vs. downstairs. Perhaps I could accomplish that by combining LANs...

I turned off DHCP on the upstairs router, changed the IP to match the downstairs subnet and plugged a wifi repeater connected to the downstairs router into the upstairs router. As expected upstairs devices are now getting IPs from the downstairs router DHCP. Upstairs computers have a default gateway set to the upstairs router. So it appears that the upstairs devices can communicate with the downstairs devices while using the upstairs WAN for internet.
Is this typical behavior?

Collapse -
Sure. Combine the LANs but choose which gateway.
by R. Proffitt Forum moderator / April 26, 2018 12:40 PM PDT
In reply to: Router Magic

The gateway is where IP non-LAN traffic is sent. So if you want certain machines to use one router for the Internet then you change the gateway as you wish.

While I may share ideas here, I can't teach all about IP networking. That is, be sure to find articles on each area as you need more information.

Popular Forums
icon
Computer Newbies 10,686 discussions
icon
Computer Help 54,365 discussions
icon
Laptops 21,181 discussions
icon
Networking & Wireless 16,313 discussions
icon
Phones 17,137 discussions
icon
Security 31,287 discussions
icon
TVs & Home Theaters 22,101 discussions
icon
Windows 7 8,164 discussions
icon
Windows 10 2,657 discussions

Does BMW or Volvo do it best?

Pint-size luxury and funky style

Shopping for a new car this weekend? See how the BMW X2 stacks up against the Volvo XC40 in our side-by-side comparison.