I've seen a few topics regarding this but haven't found a solution yet. Quite a few of the remote offices I support are behind someone else's equipment that I have no control over. This or a firewall is behind a terrible-no-good Frontier DSL modem. Either way, it's not a great setup I know.
I've set up an SDWAN via Sophos Central between a test group of firewalls. Firewalls that either have static IPs or actually get an external IP from the ISP's modem via DHCP work perfectly. I can't seem to find the right combination of settings to get those troublesome double-nat'd, I'll call them "client" firewalls, to connect. I've tried setting both ends of the IPsec tunnel to "initiate connection" to having the client firewall set to that while the "main" firewall is set to "respond only." There are a lot of settings on these IPsec connection settings pages, so I just don't know what to fiddle with.
Has anyone else had luck getting something like this working?
Thanks!
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