Full Tunnel Meraki (branch) to Sonicwall (primary site) S2S VPN

[RCMikesell]

Looking to build a full tunnel from a meraki at a branch office to send all traffic over an existing Site to Site VPN to a Sonicwall at the main site.  Based upon reading the Site-to-site_VPN setup for non-meraki VPNs I believe I should be able to set a 0.0.0.0/0 in the IPSec subnets (I am just doing 8.8.8.8 initially as a test).  I am basing the sonicwall side on their "how can i configure tunnel all internet traffic over site to site vpn (170504924710971).    When I set this up,  I get no return on pings.   Has anyone else been able to successfully setup and operate this type of setup?   

Thanks

[BlakeRichardson]

Have you followed this documentation?

https://documentation.meraki.com/MX/Site-to-site_VPN/MX_to_Sonicwall_Site-to-Site_VPN_Setup

https://www.sonicwall.com/medialibrary/docs/tech-alliance/IntegrationGuide_CiscoMeraki.pdf

[BlakeRichardson]

I can confirm this works, I setup a S2S tunnel from my MX at home to an old Sonicwall TZ600 about two years ago just to have a play around with site to site using different vendors. 

[RCMikesell]

Blake, 

    I did note that this was "over an existing Site to Site VPN" that we have in place that those guides assist in setting up.  That is working without issue.  I need to add/update the VPN now to send all internet bound traffic over this same existing VPN and have it reach the internet and allow returns.  That said, maybe I may need firewall rules, but as that data is transformed on the SonicWall site using a Nat rule from WAN to WAN I assumed it was allowed traffic.  

I used these two guides when trying to initially configure and test with just 8.8.8.8

https://www.sonicwall.com/support/knowledge-base/how-can-i-configure-tunnel-all-internet-traffic-ove...

https://documentation.meraki.com/MX/Site-to-site_VPN/Site-to-Site_VPN_Settings#Non-Meraki_VPN_peers