So I've setup a IPsec Site to Site VPN between a Sonicwall TZ300 and a Sophos XG210 - I've checked all the ACL stuff under administration in the XG, I've setup Firewall rules to allow VPN to Lan any/any, and I've tried every possible combination of Encryption/timeout/Etc for the profile settings of the VPN...I'm at a loss. The XG routes to the sonicwall and the sonicwall subnet fine, but, I can't seem to go from the sonicwall subnet to the xg subnet....
After a S2S Ipsec is up, and you can ping from one side to the other, what settings on the sophos are left that would prevent you from being able to ping it/ping in the subnet assigned to the vpn?
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