D-Link DSL-2740B manual Router Settings, Default Route, Firewall, Primary DNS Address

DSL-2740B Wireless ADSL Router User Guide

PCR

SCR

CDVT

MBS

by bursts of packets at variable intervals, and some moderate packet loss and delay is acceptable. This category is typically used for audio and video applications such as teleconferencing. The network must support QoS Class 2 to use VBR.

Peak Cell Rate – The PCR is inversely related to the time interval between ATM cells. It is specified for all three service categories (UBR, CBR and VBR) in Kbps.

Sustainable Cell Rate – The SCR is defined for the VBR service category. This is the rate that can be sustained for “bursty”, on-off traffic sources. It is a function of Maximum Burst Size (MBS) and the time interval (between cells).

Cell Delay Variation Tolerance – CDVT is a measure of the cell clumping phenomenon by which cells are delayed in the network and are clumped together and arrive at a system at a faster rate than negotiated. Increasing the CDVT creates greater bucket depth.

Maximum Burst Size – The MBS is the maximum number of bytes that can be sent continuously from the source to the destination dropping any packets. Some ATM providers set the MBS and CDVT very low and adjust up if problems occur.

Router Settings:

Parameters	Description
Default Route	When this is enabled, the Router will be considered to be the primary
	gateway to the Internet and WAN for systems on your network. If you
	are using the Router on a network with one or more alternative gateway
	routers, you may prefer to disable this if you will use another router as
	the primary gateway.
NAT	Network Address Translation may be enabled or disabled with the pull-
	down menu. Keep in mind that disabling NAT allows only a single
	computer to be used for Internet access through the Router. NAT is
	enabled and disabled for the Router on all connections (i.e. Pvc0 – Pvc7)
	if your Router is set up for multiple virtual connections.
Firewall	Use this to universally enable or disable the Firewall and Filter features
	available in the Router. If you disable this you will not be able to
	configure settings in the Firewall Configuration window or Filters
	window in the Advanced directory.
Primary DNS Address	This is the IP address of the first choice for Domain Name Service (DNS)
	used to match the named URL web address used by most browsers with
	the actual global IP address used for a web server. Usually this will be a
	server owned by the ISP. Get this IP address from your ISP.
Secondary DNS Address	This is the second choice for a DNS server. Get this IP address from
	your ISP.

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