241
Step Command Remarks
time
is 30000 milliseconds, and the value of
the Reachable Time field in sent RA
messages is 0.
Setting the maximum number of attempts to send an NS
message for DAD
An interface sends an NS message for DAD for an obtained IPv6 address. The interface resends the
NS message if it does not receive a response within the time specified by the ipv6 nd ns
retrans-timer command. If the interface receives no response after making the maximum attempts
specified by the ipv6 nd dad attempts command, the interface uses the IPv6 address.
To set the attempts to send an NS message for DAD:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface
interface-type
interface-number
N/A
3. Set the number of attempts
to send an NS message for
DAD.
ipv6 nd dad attempts
interval
The default setting is 1. When the
interval argument is set to 0, DAD
is disabled.
Enabling ND proxy
About ND proxy
ND proxy enables a device to answer an NS message requesting the hardware address of a host on
another network. With ND proxy, hosts in different broadcast domains can communicate with each
other as they would on the same network.
ND proxy includes common ND proxy and local ND proxy.
• Common ND proxy.
As shown in Figure 89, Gi
gabitEthernet 1/0/1 with IPv6 address 4:1::99/64 and GigabitEthernet
1/0/2 with IPv6 address 4:2::99/64 belong to different subnets. Host A and Host B reside on the
same network but in different broadcast domains.
Figure 89 Application environment of ND proxy
Because Host A's IPv6 address is on the same subnet as Host B's, Host A directly sends an NS
message to obtain Host B's MAC address. However, Host B cannot receive the NS message
because they belong to different broadcast domains.
To solve this problem, enable common ND proxy on GigabitEthernet 1/0/1 and GigabitEthernet
1/0/2 of the router. The router replies to the NS message from Host A, and forwards packets
from other hosts to Host B.
• Local ND proxy.
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