Running a Sonicwall TZ570 SSLVPN parallel to another security device.
A little backstory....
Our company recently upgraded our infrastructure to Comcast EDI with SD-WAN and Firewall at 5 locations which will tie the offices together. I have a Sonicwall TZ570 at our headquarters location that I would like to use for VPN clients to connect from home. I was told by one of the Comcast engineers that I would be able to use the Sonicwall device parallel to their security device using one of the /29 addresses.
The SD-WAN device is occupying the former LAN address of the Sonicwall (172.16.1.254). I changed the Sonicwall to 172.16.1.253 and plugged back into our lan switch. I was able to add one of the /29 addresses to the WAN ports on the Sonicwall and successfully connect to the VPN via NetExtender.
Currently the VPN clients have their own IP address range (172.16.50.100-150) when they connect.
I had them add a static route on the SD-WAN device of 172.16.50.0/24 255.255.255.0 via 172.16.1.253
My issue is what happens after I connect. I can ping resources on my LAN (172.16.1.0/24). But I cant access or ping anything at my other branch locations (172.16.2.0, 172.16.3.0, 172.16.4.0, and 172.16.5.0)
I am sure this is a routing issue but I am at a dead end.
Am I missing something or can this not be done the way I am doing it?
Please let me know if any clarity is needed.
I appreciate any help!