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Your "Local connection" is your regular (physical) connection over which the IPsec VPN tunnel is built. Disabling that interface will completely isolate your windows client from the network; thus the VPN tunnel will go down as well. You can try using traceroute to verify whether or not your traffic is going through the VPN tunnel. To provide more ...


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The partial screen load before failure looks to me like a MTU size mismatch. It is common for tunnels to have a smaller MTU then 1500. As a test, temporarily reduce the configured MTU of your RDP client to see if makes a difference. If your client is running Windows, here is a link: https://becomethesolution.com/how-to-change-and-check-windows-mtu-size


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Make sure in the sonicwall, in the VPN user configuration, that those users are allowed to access the 192.168.100.X network. You did correctly by adding the firewall rules, but you have VPN policy too. By default sonicwall will allow nothing to the vpn user, but if you choose All Firewalled subnet, the draytek range might not be into that security group, ...


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There is a known bug in Linux kernel 4.15, which Ubuntu 18.04 ships, that causes the IP address to change in this way. It was caused by 5efec5c655dd ("xfrm: Fix eth_hdr(skb)->h_proto to reflect inner IP version") and was later fixed with 87cdf3148b11 ("xfrm: Verify MAC header exists before overwriting eth_hdr(skb)->h_proto"), which was part of the 4.16 ...


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