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Vigor2952 Series User’s Guide
59
WAN Connection
Detection
Such function allows you to verify whether network
connection is alive or not through ARP Detect or Ping Detect.
Mode – Choose ARP Detect or Ping Detect for the system to
execute for WAN detection. If you choose Ping Detect as the
detection mode, you have to type required settings for the
following items.
Ping IP – If you choose Ping Detect as detection mode,
you also can enable this setting to use current WAN
gateway IP address for pinging. With the IP address(es)
pinging, Vigor router can check if the WAN connection is
on or off.
TTL (Time to Live) – Set TTL value of PING operation.
MTU
It means Max Transmit Unit for packet.
Path MTU Discovery – It is used to detect the maximum MTU
size of a packet not to be segmented in specific transmit
path.
Click Detect to open the following dialog.
Path MTU to – Type the IPv4 or IPv6 address as the
specific transmit path.
MTU size start from – Determine the starting point
value of the packet. Default setting is 1500.
MTU reduce size by– It determines the decreasing size
of MTU value. For example, the number specified in
this field is “8”. The maximum MTU size is “1500”.
After clicking the “detect” button, the system will
calculate and get the suitable MTU value such as 1500,
1492, 1484 and etc., automatically.
Detect – Click it to detect a suitable MTU value.
Accept– After clicking it, the detected value will be
displayed in the field of MTU.
TTL
Change the TTL value – Enable or disable the TTL (Time to
Live) for a packet transmitted through Vigor router.
Enable - TTL value will be reduced (-1) when it passess
through Vigor router. It will cause the client, accessing
Internet through Vigor router, be blocked by certain ISP
when TTL value becomes “0”.
Disable – TTL value will not be reduced. Then, when a packet
passes through Vigor router, it will not be cancelled. That is,
the client who sends out the packet will not be blocked by
ISP.
PPP/MP Setup
PPP Authentication – Select PAP only or PAP or CHAP for
PPP.
Idle Timeout – Set the timeout for breaking down the
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