D-Link DFL-260E User Manual page 119

3.4.5. ARP Advanced Settings
Summary
requests.
Default: Enabled
ARP Expire
Specifies how long a normal dynamic item in the ARP table is to be retained before it is removed
from the table.
Default: 900 seconds (15 minutes)
ARP Expire Unknown
Specifies in seconds how long NetDefendOS is to remember addresses that cannot be reached. This
is done to ensure that NetDefendOS does not continuously request such addresses.
Default: 3
ARP Multicast
Determines how NetDefendOS is to deal with ARP requests and ARP replies that state that they are
multicast addresses. Such claims are usually never correct, with the exception of certain load
balancing and redundancy devices, which make use of hardware layer multicast addresses.
Default: DropLog
ARP Broadcast
Determines how NetDefendOS deals with ARP requests and ARP replies that state that they are
broadcast addresses. Such claims are usually never correct.
Default: DropLog
ARP cache size
How many ARP entries there can be in the cache in total.
Default: 4096
ARP Hash Size
Hashing is used to rapidly look up entries in a table. For maximum efficiency, the hash size should
be twice as large as the table it is indexing. If the largest directly-connected LAN contains 500 IP
addresses then the size of the ARP entry hash should be at least 1000 entries.
Default: 512
ARP Hash Size VLAN
Hashing is used to rapidly look up entries in a table. For maximum efficiency, the hash size should
be twice as large as the table it is indexing, so if the largest directly-connected VLAN contains 500
IP addresses, the size of the ARP entry hash should be at least 1000 entries.
Default: 64
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Chapter 3. Fundamentals