MX64 - Setting a route to subnet managed by a gateway

[fmarcoux96]

Hey everyone,

I am currently trying to create a route that will allow me to create a sub-network controlled by another router.

Right now, my MX is 192.168.1.1, the gateway (another router) is plugged into it on port 4 with WAN IP 192.168.1.200.

The subnet controlled by the gateway is 192.168.100.0/24, the gateway itself has a LAN IP of 192.168.100.1. I am trying to be able to ping both ways between my MX network and the gateway network.

Is there a way? I tried a static route (next hop to gateway WAN IP (.1.200)) but it just renders the device unaccessible from either WAN nor LAN IP.

[PhilipDAth]

On your MX add a static route for 192.168.100.0/24 pointing to 192.168.1.200 - so you have that bit correct.

Is by chance this other gateway a firewall or performing NAT between its LAN and WAN IP?  You will need to stop that it make this working.

It may be simpler to take over the 192.168.100.0/24 on the MX, and get rid of the other router.

[fmarcoux96]

Yes it is a IPPBX with some basic router capabilities. I am trying to create a subnetwork to prevent it from interferring with my current VoIP phones. However, I cannot disable NAT on it.

[PhilipDAth]

In that case your options are limited.  The 192.168.100.0/24 subnet will be able to talk to 192.168.1.0.24 via NAT, but 192.168.1.0/24 will not be able to initiate traffic into the 192.168.100.0/24 subnet.

[fmarcoux96]

Is there a way on Windows to force this subnet to go to another gateway? It's just for 1 computer that needs access to both network.

And yes, the other way around works, even my non-Meraki VPN peer is reachable.

[PhilipDAth]

You could put the MX in both subnets (disabled DHCP for the 192.168.100.0/24 subnet).  Then for the one client statically configure it with the gateway of the MX for the 192.168.100.0/24 subnet.

[fmarcoux96]

Do I need to create another VLAN with its own subnet for this?

[PhilipDAth]

Correct.