Operation Manual – IPv6
H3C S3610&S5510 Series Ethernet Switches
Chapter 1 IPv6 Basics Configuration
1-19
1.4.4 Configuring the Number of Attempts to Send an NS Message for DAD
An interface sends a neighbor solicitation (NS) message for DAD 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 attempts to send an
NS message reaches the maximum, the acquired address is considered available.
Follow these steps to configure the attempts to send an NS message for DAD:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Enter interface view
interface interface-type
interface-number
—
Configure the number of
attempts to send an NS
message for DAD
ipv6 nd dad attempts
value
Optional
1 by default. When the
value
argument is set to 0,
DAD is disabled.
1.5 Configuring PMTU Discovery
1.5.1 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 packets 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…
Use the command…
Remarks
Enter system view
system-view
—
Configure a static PMTU
for a specified IPv6
address
ipv6 pathmtu
ipv6-address
[
value
]
Required
By default, no static
PMTU is configured.
1.5.2 Configuring the Aging Time for PMTU
After the MTU of the path from the source host to the destination host is dynamically
determined (refer to
), the source host sends subsequent
packets to the destination host on basis of this MTU. After the aging time expires, the