Member Avatar for jadisme

Hi. I have a VPN in place between two SonicWall routers (A and B) in two different towns with two different ISPs.

At Site A we have a new ISP who gve me a Modem/router in a box but I only want the modem portion because I do not want to have to setup a VPN between the new comcast router and my siteB.

Can I do that? Thanks.

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  • Latest Post Latest Post by bobbyraw

Dani AI

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Short answer: yes — you can make the SonicWall the edge device, but how you do it depends on whether the ISP supplied a true modem or a modem+router combo.

As suggested, a trial is reasonable, but perform the change in a maintenance window and back up configs first. was right to ask whether the ISP gave one box or two. If the ISP provided a separate modem, simply connect the SonicWall WAN to the modem and set the SonicWall WAN to obtain an address (DHCP) or use PPPoE if the ISP requires it. If the ISP gave a single combo gateway, look for a "bridge", "passthrough" or "IP passthrough" setting to disable NAT/router functions so the SonicWall can receive the public IP. If that option is not exposed, contact the ISP and ask them to either enable bridge/passthrough or reassign the public/static IP to your SonicWall (they may need the SonicWall WAN MAC).

A few practical notes: avoid double NAT — it can break IPsec unless NAT-T/port forwarding is configured. As a workaround, putting your SonicWall in the ISP box's DMZ can work but is less clean and less secure than true bridge mode. After switching, verify the SonicWall WAN shows a public IP, check VPN phase1/phase2 and logs, and confirm traffic flows before decommissioning the ISP router functions. If anything goes wrong, revert quickly using your saved config and contact the ISP for support.

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Member Avatar for Michael_Knight

I can't see why not. Most modern routers connect to the web, and a modem will certainty connect.

Give it a go, any problems, let us know.

Member Avatar for bobbyraw

Modem/router is this a single device or 2 separate devices. Most ISP provide business with static IP so if it's 2 separate devices you would have to call the company and let them know you want to set the static IP on you router ( might be an issue with the company) but give it a shot.

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