Figure 5-2 Virtual Private Network (Vpn) Example - NEC Univerge SV9100 Manual

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SV9100 Networking Manual

VPNs can be implemented in hardware or software. Single users, such as

traveling sales personnel, may have a software based VPN client on their laptop

computer. This connects back to the Head Office VPN server. For larger sites, the

VPN is typically implemented using a hardware VPN – this is often incorporated in

to a firewall solution.

The diagram below is example of how a VPN tunnel may be implemented. The

red lines in the diagram show the tunnels that are created through the Internet.

Each network can connect to the others as though they are connected with private

connections (kilostream, etc.), without the issues relating to NAT.

Figure 5-2 Virtual Private Network (VPN) Example

UNIVERGE SV9100

Head Office LAN

When IP address translation is applied to a VoIP packet, the application fails and

the communication path is broken. VoIP packets contain the IP address

information and the ports used as part of its payload. When NAT is applied, only

the header parameter is changed, not the payload data that affects the process of

data packets within the VoIP switch and terminal.

Mobile Workers

(Software VPN Client)

Home Office LAN