D-Link DIR-816 User Manual page 176

DIR-816 Wireless AC750 Dual Band Router with 3G/LTE
Support and USB Port
User Manual
Parameter
Enable DPD
DPD delay
The maximum
number of failures
DPD
TCP MSS
TCP MSS Value
Allow traffic between
tunneled networks
Move the switch to the right to enable using DPD protocol for this
tunnel. Such a setting allows to check the status of a remote host: if
encrypted packets exchange between the router and the remote host
breaks down, the router starts sending DPD messages to the remote
host. If the switch is moved to to the left, the DPD delay and The
maximum number of failures DPD fields are not available for
editing.
A time period (in seconds) between attempts to check the status of a
remote host. By default, the value 5 is specified.
A number of DPD messages that were sent to check the status of a
remote host and left unanswered. By default, the value 3 is specified.
If a remote host does not answer the specified number of messages,
the router breaks down the tunnel connection, removes the encryption
keys, and tries to activate the connection.
Maximum Segment Size of a TCP packet. This parameter influences
the size of a TCP packet which will be sent from a remote host to the
router.
If the Manual value is selected, you can specify the parameter in the
TCP MSS Value field.
If the Path MTU Discovery value is selected, the parameter will be
configured automatically.
The maximum size (in bytes) of a non-fragmented packet. The field is
available for editing when the Manual value is selected from the TCP
MSS drop-down list.
Move the switch to the right to allow data exchange between subnets
with which IPsec tunnels have been created.
Page 176 of 215
Configuring via Web-based Interface
Description