D-Link DBG-2000 Product Manual 1 - Page 72

Active, Protocol, Internal port, External port, Interface, IP address, Field, Description, H.323

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Active Protocol Internal port External port Interface IP address DBG-2000 User Guide It indicates if the UPnP port is still open in the device or not. It displays the network protocol used by the gateway. It displays the internal ports opened by UPnP (if any). It displays the external ports opened by UPnP (if any). It refers to the LAN/VLAN segment on which the UPnP option is enabled. It displays the IP address of the UPnP device detected by the gateway. Application Layer Gateways (ALGs) Application Level Gateways (ALGs) are security components that enhance the firewall and NAT support of the gateway to seamlessly support application layer protocols. In some cases enabling the ALG will allow the firewall to use dynamic, ephemeral TCP/ UDP ports to communicate with the known ports a particular client application (such as H.323 or RTSP) requires; otherwise, the admin would have to open a large number of ports to accomplish the same support. ALG understands the protocol used by the specific application that it supports. It is a very secure and efficient way of introducing client applications through the gateway's firewall. Field RTSP SIP H.323 TFTP SMTP Description Enable it to allow applications that use Real Time Streaming Protocol to receive streaming media from the Internet. QuickTime and Real Player are some of the common applications using this protocol. Enable it to allow devices and applications using VoIP (Voice over IP) to communicate across NAT. Enable it to allow H.323 (specifically Microsoft Netmeeting) clients to communicate across NAT. Enable it to allow Trivial FTP (TFTP) clients and servers to transfer data across NAT. Enable it to transfer email between mail servers over the Internet and enter the port at which the SMTP packets are inspected. E-mail filter list The E-mail filter list appears only when the SMTP is enabled. Simple Mail Transfer Protocol (SMTP) is a text-based protocol used for transferring emails between mail servers over the Internet. Typically, the local SMTP server is located on a DMZ so that mail sent by remote SMTP servers traverses the gateway to reach the local server. Local users then use email client software to retrieve their email from the local SMTP server. SMTP is also used when clients send emails. In addition, SMTP ALG can monitor SMTP traffic originating from both clients and servers. 72

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Active
It indicates if the UPnP port is still open in the device or not.
Protocol
It displays the network protocol used by the gateway.
Internal port
It displays the internal ports opened by UPnP (if any).
External port
It displays the external ports opened by UPnP (if any).
Interface
It refers to the LAN/VLAN segment on which the UPnP option is enabled.
IP address
It displays the IP address of the UPnP device detected by the gateway.
Application Layer Gateways (ALGs)
Application Level Gateways (ALGs) are security components that enhance the firewall and NAT support of the
gateway to seamlessly support application layer protocols. In some cases enabling the ALG will allow the firewall to use dynamic, ephemeral
TCP/ UDP ports to communicate with the known ports a particular client application (such as H.323 or RTSP) requires; otherwise, the admin
would have to open a large number of ports to accomplish the same support. ALG understands the protocol used by the specific application that
it supports. It is a very secure and efficient way of introducing client applications through the gateway’s firewall.
Field
Description
RTSP
Enable it to allow applications that use Real Time Streaming Protocol to receive streaming
media from the Internet. QuickTime and Real Player are some of the common applications
using this protocol.
SIP
Enable it to allow devices and applications using VoIP (Voice over IP) to communicate
across NAT.
H.323
Enable it to allow H.323 (specifically Microsoft Netmeeting) clients to communicate across
NAT.
TFTP
Enable it to allow Trivial FTP (TFTP) clients and servers to transfer data across NAT.
SMTP
Enable it to transfer email between mail servers over the Internet and enter the
at
port
which the SMTP packets are inspected.
E-mail filter list
The
appears only when the SMTP is enabled. Simple Mail Transfer Protocol (SMTP) is a text-based protocol used for transferring
E-mail filter list
emails between mail servers over the Internet. Typically, the local SMTP server is located on a DMZ so that mail sent by remote SMTP servers
traverses the gateway to reach the local server. Local users then use email client software to retrieve their email from the local SMTP server.
SMTP is also used when clients send emails. In addition, SMTP ALG can monitor SMTP traffic originating from both clients and servers.
DBG-2000 User Guide
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