I have branch office using a 10.0.0.0/24 LAN subnet with a Meraki MX appliance. The LAN connects back to the home office on VPN and everything works great. The problem is that they share physical space with a cooperative 2nd office that I'm not the admin of, and the two offices share printers and a local NAS file server. The 2nd network is a SonicWall on a flat network LAN of 192.168.0.0/24 with no VLANs defined.
The previous Cisco 1841 router simply did this to make it work:
description 2ND LAN Interface
ip address 192.168.0.135 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
I've tried defining the 2nd network as VLAN 2 with the correct LAN & same IP, verified the physical port connection, made sure the port is trunking, but no joy. I've got to be missing an obvious solution here because it's not supposed to be this hard. (or so I'm told)
Hi @AlexGregoire ,
If the Sonicwall doesn't support VLANs, then we need to send the traffic untagged for the Sonicwall to be able to understand it. Make sure the port on the MX is configured as a trunk port with native vlan 2. It is also worth to check the port config on the Sonicwall side to match what we have on our side.
How are they routing traffic to the 10.0.0.0/24 network? Do they have a static route configured on the Sonicwall to send that traffic to MX? If so, we need to make sure we are using the same interface IP on the MX as they have configured as next hop on the Sonicwall.