Site-to-site Virtual Private Networks (VPNs) are VPNs that are established between dedicated VPN devices. Site-to-site VPNs allow the users residing on the LAN on either side to communicate securely. The advantage of site-to-site VPNs is that they negate the need to install VPN client software on the hosts that reside on either side of the LAN. Instead, the secure connection between the VPN gateways is transparent to the end users. Cisco IOS software supports several site-to-site VPN solutions. These solutions, which are described in the following sections, include the following:
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