Alaxala AX2200S Series Configuration Manual page 436

23 DHCP Snooping
Figure 23-9 Relationship between a basic inspection and an optional inspection of
(a) Source MAC address specification (src-mac check)
This inspection item checks if the source MAC address and the sender MAC address of a
received ARP packet are the same.
This inspection is performed on both ARP requests and ARP replies.
(b) Destination MAC address specification (dst-mac check)
This inspection item checks if the destination MAC address and the target MAC address of
a received ARP packet are the same.
This inspection is performed on an ARP reply only.
(c) IP address specification (ip check)
This inspection item checks if the target IP address of the received ARP packet is within the
following ranges.

1.0.0.0 to 126.255.255.255

128.0.0.0 to 223.255.255.255
This inspection is performed on an ARP reply only.
Table 23-4 Fields of an ARP packet subject to the optional inspection
Fields of an ARP packet
414
dynamic ARP inspection
src-mac check
Reque
st
dst-mac check
Reply Reque Reply
st
ip check
Reque Reply
st