User's Manual

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3.4.4 VPN Passthrough
VPN passthrough configurations including: L2TP, IPSec, and PPTP passthrough.
L2TP Passthrough: L2TP is an extension to the Point-to-Point Protocol, which is an important
component for VPNs. VPNs allow users and telecommuters to connect to their corporate
intranets or extranets.
IPSec Passthrough: IPSec is a framework for a set of protocols for security at the network or
packet processing layer of network verification.
PPTP Passthrough: PPTP is a protocol that allows corporations to extend their own
corporate network through private “tunnels” over the public Internet. Enable/Disable this
protocol verification.
3.4.5 DNS
Domain Name Servers are used to map an IP address to search domain name, your ISP may
provide the IP address for one or more domain name servers