D-Link DFL-2500 - Manual (Page 313)

ARPExpire
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)
ARPExpireUnknown
Specifies 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 seconds
ARPMulticast
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
ARPBroadcast
Determines how NetDefendOS is to deal with ARP requests and ARP replies that state that they are
broadcast addresses. Such claims are usually never correct.
Default: DropLog
ARPCacheSize
How many ARP entrys there can be in the cache in total.
Default: 4096
ARPHashSize
So-called "hash tables" are used to rapidly look up entries in a table. For maximum efficiency, a
hash should be twice as large as the table it is indexing, so if the largest directly-connected LAN
contains 500 IP addresses, the size of the ARP entry hash should be at least 1000 entries.
Default: 512
ARPHashSizeVLAN
So-called "hash tables" are used to rapidly look up entries in a table. For maximum efficiency, a
hash should be twice as large as the table it is indexing, so if the largest directly-connected LAN
contains 500 IP addresses, the size of the ARP entry hash should be at least 1000 entries.
Default: 64
ARPIPCollision
Determines the behaviour when receiving an ARP request with a sender IP address that collides
with one already used on the receive interface. Possible actions: Drop or Notify.
Default: Drop
ARPExpireUnknown Chapter 13. Advanced Settings
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