Some ISPs assign private IP addresses for a multi-site company, and most 4G providers offer private IP, too.
VPN Server with private IP behind NAT makes branches unable to establish a LAN-to-LAN VPN tunnel.
To overcome the limitations, register all your VPN Vigor Routers to DrayTek VPN Matcher, then VPN Matcher will help exchanging the connection information between VPN Server and branches.
With the connection information, VPN tunnel can be established successfully.
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