Setting The Maximum Number Of Dhcpv6 Snooping Entries; Enabling Dhcpv6-Request Check - HP FlexNetwork MSR2003 Configuration Manual

Setting the maximum number of DHCPv6
snooping entries
Perform this task to prevent the system resources from being overused.
To set the maximum number of DHCPv6 snooping entries:
Step
1. Enter system view.
2. Enter interface view.
3. Set the maximum number
of DHCPv6 snooping
entries for the interface to
learn.

Enabling DHCPv6-REQUEST check

Perform this task to use the DHCPv6-REQUEST check function to protect the DHCPv6 server
against DHCPv6 client spoofing attacks. Attackers can forge DHCPv6-RENEW messages to renew
leases for legitimate DHCPv6 clients that no longer need the IP addresses. The forged messages
disable the victim DHCPv6 server from releasing the IP addresses. Attackers can also forge
DHCPv6-DECLINE or DHCPv6-RELEASE messages to terminate leases for legitimate DHCPv6
clients that still need the IP addresses.
The DHCPv6-REQUEST check function enables the DHCPv6 snooping device to check every
received DHCPv6-RENEW, DHCPv6-DECLINE, or DHCPv6-RELEASE message against DHCPv6
snooping entries.
•
If any criterion in an entry is matched, the device compares the entry with the message
information.
If they are consistent, the device considers the message valid and forwards it to the
DHCPv6 server.
If they are different, the device considers the message forged and discards it.
•
If no matching entry is found, the device forwards the message to the DHCPv6 server.
To enable DHCPv6-REQUEST check:
Step
1. Enter system view.
2. Enter interface view.
3. Enable
DHCPv6-REQUEST
check.
Command
system-view
interface interface-type
interface-number
ipv6 dhcp snooping
max-learning-num number
Command
system-view
interface interface-type
interface-number
ipv6 dhcp snooping check
request-message
279
Remarks
N/A
N/A
By default, the number of DHCPv6
snooping entries for an interface to
learn is not limited.
Remarks
N/A
N/A
By default, DHCPv6-REQUEST check is
disabled.
You can enable the function only on Layer
2 Ethernet interfaces and Layer 2
aggregate interfaces.