Virtual Private Networks (VPNs) 12-7The IP Profile Parameters screen appears. Enter the Remote IP Address and Remote IP Mask for the host to which you want to tunnel. The remote IPaddress and remote IP mask refer to the remote private network into which your device will be tunnelling.About IPsec TunnelsIPsec stands for IP Security, a set of protocols that supports secure exchange of IP packets at the IP layer.IPsec is deployed widely to implement Virtual Private Networks (VPNs). See Overview on page 12-1 for moreinformation.IPsec supports two encryption modes: Transport and Tunnel. Transport mode encrypts only the data portion(payload) of each packet, but leaves the header untouched. The more secure Tunnel mode encrypts both theheader and the payload. On the receiving side, an IPsec-compliant device decrypts each packet. NetopiaRouters support the more secure Tunnel mode.DES stands for Data Encryption Standard, a popular symmetric-key encryption method. DES uses a 56-bit key.The Netopia 4753 offers IPsec DES encryption over the VPN tunnel.ConfigurationIPsec tunnels are defined in the same manner as PPTP tunnels. You configure the Connection Profile as follows.From the Main Menu navigate to WAN Configuration and then Add Connection Profile.IP Profile ParametersAddress Translation Enabled: YesNAT Map List... Easy-PATNAT Server List... Easy-ServersLocal WAN IP Address: 0.0.0.0Remote IP Address: 173.167.8.10Remote IP Mask: 255.255.0.0Filter Set...Remove Filter SetReceive RIP: BothEnter a subnet mask in decimal and dot form (xxx.xxx.xxx.xxx).MainMenuWANConfigurationAdd ConnectionProfile
