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Common VPN Situations
VPN Pass-through
Figure47: VPN Pass-through
Here, a PC on the LAN behind the VRT-311 / VRT-311S is using VPN software, but the VRT-
311 / VRT-311S is NOT acting as a VPN endpoint. It is only allowing the VPN connection.
• The PC software can use any VPN protocol supported by the remote VPN.
• The remote VPN Server must support client PCs which are behind a NAT router, and so
have an IP address which is not valid on the Internet.
• The VRT-311 / VRT-311S requires no VPN configuration, since it is not acting as a VPN
endpoint.
Client PC to VPN Gateway
Figure48: Client PC to VPN Server
In this situation, the PC must run appropriate VPN client software in order to connect, via the
Internet, to VRT-311 / VRT-311S. Once connected, the client PC has the same access to LAN
resources as PCs on the local LAN (unless restricted by the network administrator).
• IPsec is not the only protocol which can be used in this situation, but VRT-311 / VRT-
311S supports IPsec ONLY.
• Windows 2000 and Windows XP include a suitable IPsec VPN client program. Configura-
tion of this client program for use with VRT-311 / VRT-311S is covered later in this
document.