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| NAT Configuration
ALG
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The RG300 supports the passthrough of three of the most commonly used
VPN protocols; PPTP, L2TP, and IPsec, as well as VoIP SIP traffic. The VPN
protocols allow remote users to establish a secure connection to their
corporate network. If your service provider supports VPNs, then these
protocols can be used to create an authenticated and encrypted tunnel for
passing secure data over the Internet (that is, a traditionally shared data
network).
Figure 35: ALG Settings
The following items are displayed on this page:
SIP ALG Enable
Enables the passthrough of VoIP SIP traffic on the
configured server port numbers.
SIP Server Ports
Lists the SIP server ports used for VoIP traffic.
Port Number
Adds a new SIP Server port number.
PPTP Passthrough
PPTP (Point-to-Point Tunneling Protocol)
provides a secure tunnel for remote client access to a PPTP security
gateway. PPTP includes provisions for call origination and flow control
required by ISPs.
L2TP IPsec Passthrough
L2TP (Layer 2 Tunneling Protocol)
merges the best features of PPTP and the Layer 2 Forwarding (L2F)
protocol. Like PPTP, L2TP requires that the ISP
s routers support the
protocol.
IPsec (Internet Protocol Security)
encrypts and authenticates
entire IP packets and encapsulates them into new IP packets for secure
communications between networks.
