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Vigor2900 Series User’s Guide
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PPP Authentication It specifies the PPP authentication method for PPP/MP
connections. Normally you can set it to PAP/CHAP for better
compatibility.
TCP Header Compression VJ Compression - It is used for TCP/IP protocol header
compression. Normally it is set to None to improve bandwidth
utilization.
Idle Timeout Because our IDSN link type is “Dial On Demand”, the
connection will be initiated only when needed.
High Water Mark and
High Water Time
BOD stands for bandwidth-on-demand for Multiple-Link PPP
(ML-PPP or MP). High Water Mark/ High Water Time/
Low Water Mark/Low Water Time parameters are applied
when you set the Link Type to Dialup BOD. The ISDN
usually uses one B channel to access the Internet or remote
network when you choose the Dialup BOD link type. The
router will use the parameters here to decide on when you
activate/drop the additional B channel. Note that cps
(characters-per-second) measures the total link utilization.
These parameters specify the situation in which the second
channel will be activated. With the first connected channel, if
its utilization exceeds the High Water Mark and such a
channel is being used over the High Water Time, the
additional channel will be activated. Thus, the total link speed
will be 128kbps (two B channels).
Low Water Mark and Low
Water Time
These parameters specify the situation in which the second
channel will be dropped. In terms of the two B channels, if
their utilization is under the Low Water Mark and these two
channels are being used over the High Water Time, the
additional channel will be dropped. As a result, the total link
speed will be 64kbps (one B channel).
Note: If you are not sure whether your ISP can support BOD and/or ML-PPP’s
features, please seek assistance from your ISP, local dealers or our website:
support@draytek.com.
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The Vigor router has a built-in real time clock which can update itself manually or
automatically by means of Network Time Protocols (NTP). As a result, you can not only
schedule the router to dialup to the Internet at a specified time, but also restrict Internet access
to certain hours so that users can connect to the Internet only during certain hours, say,
business hours. The schedule is also applicable to other functions.
You have to set your time before set schedule. In the System Management group, select
Time and Date to open the time setup page, press Inquire Time button to set the Vigor
router’s clock to current time of your PC. The clock will reset once if you power down or reset
the router. There is another way to set up time. You can inquiry an NTP server (a time server)
on the Internet to synchronize the router’s clock. This method can only be applied when the
WAN connection has been built up.