That seems to be where I'm hung up currently. Unfortunately I have to submit changes to that firewall to be added to its management tool by the vendor, so I'm waiting on them to add the new routes. When I originally opened this thread, it wasn't getting that far - the traffic was failing at the first hop - timing out or responding as host unreachable from 10.128.128.128, so it seemed to be an issue within my internal Meraki network. Setting a source-based route in VPN mode pointing to our HQ's appliance seemed to resolve this though, as traffic is now hitting that non-Meraki external firewall and stopping. So I think I'm good to go as far as the issues I was experiencing on this end. I appreciate the help!
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