D-Link DFL-260E User Manual for DFL-260E - Page 133
ARP Expire, ARP Expire Unknown, ARP Multicast, ARP Broadcast, ARP cache size
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3.5.5. ARP Advanced Settings Summary Chapter 3. Fundamentals This determines whether NetDefendOS will log failed ARP resolve requests or not. Logging can be used for monitoring purposes and can be helpful for troubleshooting network related problems. However, disabling logging can prevent attempts to "spam" log receivers with failed resolve 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. 133