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SMB same physical location, separate lans

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post #1 of 5 (permalink) Old 01-13-2020, 10:49 AM - Thread Starter
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SMB same physical location, separate lans

Hello everyone,
I have a... Unique.. Set up that I am wondering if this is even possible on.

I rent a room where the owner of the home has given me leave to add my own router into the DMZ for purpose of portforwarding a server I own. It's been working great minus some double NAT issues preventing NAT Loopback working but I digress...

I'd like to open up access to my file server to someone in the same physical location, but connected onto the other LAN.

Could I forward the SMB ports used by windows to my server on my router to my server and connect to it from the router IP given to me by the second router?

Or is it not possible?
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post #2 of 5 (permalink) Old 01-13-2020, 11:05 AM
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Couldn't this be accomplished by using a subnet? It's been years since I learned CCNA so I'm just spitballing

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post #3 of 5 (permalink) Old 01-13-2020, 12:15 PM - Thread Starter
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Could you elaborate?

The networks subnets are different and to my knowledge cannot be the same, else they'd be the same network.

Is the "primary"
192.168.0.x is my own.
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post #4 of 5 (permalink) Old 01-13-2020, 03:24 PM
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Sure, why wouldnt you? Depending on what routers your have theres no reason you couldnt

So on the network, assuming that is the router, is your router, is a client on the first lan, and is the server

Easy / correct option
Router 1 needs a static route adding so it knows that 1.1/24 is hanging out off a port thats plugged into it, then it will just work.

Medium / Eh option
If you want to keep nat, (bad idea as you allready know!) , then you may be able to do it if supports DNAT or Dynamic routing.

If dynamic routing, (try this first it may "just work") : if you have plugged the routers in the correct way *(client port on to the WAN port of and both routers support whatever random protocol the router manufacture chose, you may only need to add a rule on to forward SMB to the server and it will work.

For DNAT : If it supports DNAT, you can add a nat rule to forward the traffic from to and then add another DNAT onto router two to forward the traffic onto your server. Most consumer routers will set up a rule to forward the traffic back, and as SMB is all client initated, it should all be NAT safe and work.

Super Easy method, Just get 2X 10 quid wireless adapters from Amazon, connect one to Lan 1, one to Lan 2, and dual host the sever. Turn off routing on windows server to prevent network insanity and boom done, lan 1 connects to lan 1 wifi adapter, lan 2 connected to lan 2 wifi adapter

Also the Networks can be "the same" if your router supports it, is called super netting and it lets you have a /24 over all, and then each router just manages a /25.

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post #5 of 5 (permalink) Old 01-13-2020, 06:37 PM
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Ulquiorra is correct, this is done with setting up static route in the routers.
You will also need to be doing port forwarding in the main router as well to get around your double-NAT situation to access your server properly. Just because you are in a DMZ specified port doesn't mean you arent still behind the router and going through his NAT stuff.

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