Device Configuration /
Advanced Setup
72
BEC 9800VN User Manual
NAT
The
NAT (Network Address Translation) feature transforms a private IP into a public IP, allowing
multiple users to access the internet through a single IP account, sharing the single IP address. NAT
break the originally envisioned model of IP end-to-end connectivity across the internet so NAT can
cause problems where IPSec/ PPTP encryption is applied or some application layer protocols such as
SIP phones are located behind a NAT. And NAT makes it difficult for systems behind a NAT to accept
incoming communications.
In this session, there are “VPN Passthrough”, “SIP ALG”, “DMZ” and “Virtual Server” provided to solve
these nasty problems.
NAT Status:
Enabled. It depends on ISP Connection Type in Internet settings.
VPN Passthrough:
VPN pass-through is a feature of routers which allows VPN client on a private
network to establish outbound VPNs unhindered.
SIP ALG:
Enable the SIP ALG when SIP phone needs ALG to pass through the NAT. Disable the SIP
ALG when SIP phone includes NAT-Traversal algorithm.
Interface:
Select to set DMZ/Virtual Server for
“EWAN”, “3G/4G-LTE” or “3G/4G-LTE USB”.
Service Index:
Associated to EWAN interface marking each EWAN service (0-7), to select which
EWAN service the DMZ and Virtual server are applied to.
Click
DMZ
or
Virtual Server
to move on to set the DMZ or Virtual Server
parameters, which are represented in the following scenario.
