duplicate ping after enabling secure nat

[polaris235]

Hi everyone.
Have a good time.
I have a site-to-site softether tunnel.
When I enable secure NAT on the edge server that connects me to the free Internet, I get duplicate ( DUP! ) when I ping from any server and my connection drops repeatedly.
everything was fine and I didn't make any changes.
what can I do?
Is there any other way to access the Internet without enabling secure NAT?

[solo]

https://www.softether.org/4-docs/2-howt ... Bridge_VPN
If this is your "site-to-site softether tunnel", on 10.0.0.1 set up a web proxy, eg Squid server.