Arp Opportunistic-Nd - Allied Telesis IE220 Series Manual

IP A P
DDRESSING AND ROTOCOL
-
ARP OPPORTUNISTIC ND

arp opportunistic-nd

Overview Use this command to enable opportunistic neighbor discovery for the global ARP
cache. This command changes the behavior for unsolicited ARP packet forwarding
on the device.
CAUTION
ARP/ND cache poisoning attacks. We recommend disabling it unless necessary.
Use the no variant of this command to disable opportunistic neighbor discovery
for the global ARP cache.
arp opportunistic-nd
Syntax
no arp opportunistic-nd
Default Opportunistic neighbor discovery is disabled by default.
Mode Global Configuration
Usage notes When opportunistic neighbor discovery is enabled, the device will reply to any
received unsolicited ARP packets (but not gratuitous ARP packets). The source
MAC address for the unsolicited ARP packet is added to the ARP cache, so the
device forwards the ARP packet. When opportunistic neighbor discovery is
disabled, the source MAC address for the ARP packet is not added to the ARP
cache, so the ARP packet is not forwarded by the device.
Examples To enable opportunistic neighbor discovery for the global ARP cache, enter:
awplus#
awplus(config)#
To disable opportunistic neighbor discovery for the global ARP cache, enter:
awplus#
awplus(config)#
Related ipv6 opportunistic-nd
commands
show arp
show running-config interface
C613-50644-01 Rev B
C
OMMANDS
: Opportunistic neighbor discovery can make your device more vulnerable to
configure terminal
arp opportunistic-nd
configure terminal
no arp opportunistic-nd
Command Reference for IE220 Series
AlliedWare Plus™ Operating System - Version 5.5.3-0.x
820