How to access computers from first router to second router?

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mozbius

Occasional Visitor
Current setup:
I have a RouterB (Asus RT-AC86U) (Lan: 192.168.3.1/Wan 192.168.2.20) running a VPN client (on stock firmware) connected to the WAN port of RouterA (Asus RT-AC1200G) (Lan 192.168.2.1) which has no VPN. DMZ is set on RouterA to allow transparent Internet connectivity to RouterB. Internet is provided by a cable modem connected to the Wan port of RouterA.

Reasoning:
That setup allows me to keep some PCs behind a VPN while other devices connect freely.

Question:
What do I need to set to allow me to have devices connected to RouterA access computers connected to RouterB?
 

SomeWhereOverTheRainBow

Very Senior Member
you could attempt setting up static routes, but if it doesn't work 100% by itself you may have to take RouterB out of the DMZ of router A and disable the firewall on routerB in combination with using static routes.
 

mozbius

Occasional Visitor
you could attempt setting up static routes, but if it doesn't work 100% by itself you may have to take RouterB out of the DMZ of router A and disable the firewall on routerB in combination with using static routes.

That works. I already had a static route setup but I still couldn’t reach devices on the subnet. Disabling the DMZ in RouterA and turning off the firewall in RouterB did the trick.

Thank you very much!!
 

ColinTaylor

Part of the Furniture
Disabling the DMZ in Router A should not make any difference (other than preventing remote access to Router B).
 

mozbius

Occasional Visitor
Disabling the DMZ in Router A should not make any difference (other than preventing remote access to Router B).

So then it is really RouterB’s firewall that was at fault for not allowing me to reach devices in its subnet. Disabling the DMZ makes disabling RouterB’s firewall a safer decision I guess.
 

ColinTaylor

Part of the Furniture
So then it is really RouterB’s firewall that was at fault for not allowing me to reach devices in its subnet.
Correct.

Disabling the DMZ makes disabling RouterB’s firewall a safer decision I guess.
True. If you need remote access to something like RouterB’s VPN server it would be better to forward just that one port on RouterA rather than using the DMZ.
 

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