Advantech ICR-1601 - Create; Edit Virtual Computer; Special AP & ALG

ICR-1601
91
Create / Edit Virtual Computer
The router allows you to custom your Virtual Computer rules. It supports up to a maximum of 20 rule-
based Virtual Computer sets.
When Add button is applied, Virtual Computer Rule Configuration screen will appear.
Virtual Computer Rule Configuration
Item
Value setting
Description
Global IP
A Must filled setting
This field is to specify the IP address of the WAN IP.
Local IP
A Must filled setting
This field is to specify the IP address of the LAN IP.
Enable
N/A
Then check Enable box to enable this rule.
Save
N/A
Click the Save button to save the settings.
2.5.3 Special AP & ALG
As a NAT gateway, it doesn't allow an active connection request from outside world. All this kind of
requests will be ignored by the NAT gateway. But at the client hosts in the Intranet, users may use
applications that need more service ports to be allowed for passing through the NAT gateway. The "Special
AP (application)" feature in the gateway can solve this problem. That is, some applications require multiple
connections, like Internet games, Video conferencing, Internet telephony, etc. Because of the firewall
function, these applications cannot work with a pure NAT gateway. The Special AP feature allows some of
these applications to work with this product.
Besides, application-level gateway (ALG) allows customized NAT traversal filters to be plugged into the
gateway to support address and port translation for certain application layer "control/data" protocols such
as FTP, BitTorrent, SIP, RTSP, file transfer in IM applications, etc. In order for these protocols to work
through NAT or a firewall, either the application has to know about an address/port number combination
that allows incoming packets, or the NAT has to monitor the control traffic and open up port mappings
(firewall pinhole) dynamically as required. Legitimate application data can thus be passed through the