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Chapter 9 NAT Forwarding
• L2TP Pass-through: If enabled, it allows Layer 2 Point-to-Point sessions to be
tunneled through an IP network and passed through the router.
• IPSec Pass-through: If enabled, it allows IPSec (Internet Protocol Security) to
be tunneled through an IP network and passed through the router. IPSec uses
cryptographic security services to ensure private and secure communications over
IP networks.
• FTP ALG: If enabled, it allows FTP (File Transfer Protocol) clients and servers to
transfer data via NAT.
• TFTP ALG: If enabled, it allows TFTP (Trivial File Transfer Protocol) clients and servers
to transfer data via NAT.
• H323 ALG: If enabled, it allows Microsoft NetMeeting clients to communicate via NAT.
• SIP ALG: If enabled, it allows clients communicate with SIP (Session Initiation Protocol)
servers via NAT.
• RTSP ALG: If enabled, it allows RTSP (Real-Time Stream Protocol) clients and servers
to transfer data via NAT.
9. 2. Share Local Resources in the Internet by Virtual Server
When you build up a server in the local network and want to share it on the internet,
Virtual Server can realize the service and provide it to the internet users. At the same
time virtual server can keep the local network safe as other services are still invisible
from the internet.
Virtual server can be used for setting up public services in your local network, such as
HTTP, FTP, DNS, POP3/SMTP and Telnet. Different service uses different service port.
Port 80 is used in HTTP service, port 21 in FTP service, port 25 in SMTP service and port
110 in POP3 service. Please verify the service port number before the configuration.
I want to:
Share my personal website I’ve built in local network with my friends through the internet.
For example, the personal website has been built in my home PC (192.168.1.100). I hope
that my friends in the internet can visit my website in some way. The PC is connected to
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