Configuring The Maximum Number Of Attempts To Send An Ns Message For Dad; Configuring Pmtu Discovery; Configuring A Static Pmtu For A Specified Ipv6 Address; Configuring The Aging Time For Dynamic Pmtus - 3Com 4210G Series Configuration Manual

The maximum interval for sending RA messages should be less than or equal to the router lifetime in
RA messages.

Configuring the Maximum Number of Attempts to Send an NS Message for DAD

An interface sends a neighbor solicitation (NS) message for duplicate address detection after acquiring
an IPv6 address. If the interface does not receive a response within a specified time (determined by
the ipv6 nd ns retrans-timer command), it continues to send an NS message. If it still does not
receive a response after the number of sent attempts reaches a configurable threshold, the acquired
address is considered usable.
Follow these steps to configure the attempts to send an NS message for DAD:
To do...
Enter system view
Enter interface view
Configure the number of
attempts to send an NS
message for DAD

Configuring PMTU Discovery

Configuring a Static PMTU for a Specified IPv6 Address

You can configure a static PMTU for a specified destination IPv6 address. When a source host sends a
packet through an interface, it compares the interface MTU with the static PMTU of the specified
destination IPv6 address. If the packet size is larger than the smaller one between the two values, the
host fragments the packet according to the smaller value.
Follow these steps to configure a static PMTU for a specified address:
To do...
Enter system view
Configure a static PMTU for a
specified IPv6 address

Configuring the Aging Time for Dynamic PMTUs

After the path MTU from a source host to a destination host is dynamically determined (refer to
PMTU Discovery), the source host sends subsequent packets to the destination host on basis of this
Use the command...
system-view
interface interface-type
interface-number
ipv6 nd dad attempts value
Use the command...
system-view
ipv6 pathmtu ipv6-address
[ value ]
13-15
Remarks
—
—
Optional
1 by default. When the value
argument is set to 0, DAD is
disabled.
Remarks
—
Required
By default, no static PMTU is
configured.
IPv6