D-Link DFL-2560 Product Manual - Page 114
ARP Query No Sender, ARP Sender IP, Unsolicited ARP Replies, ARP Requests, ARP Changes
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3.4.5. ARP Advanced Settings Summary Chapter 3. Fundamentals ARP Query No Sender Handles ARP queries that have a sender IP of 0.0.0.0. Such sender IPs are never valid in responses, but network units that have not yet learned of their IP address sometimes ask ARP questions with an "unspecified" sender IP. Default: DropLog ARP Sender IP Determines if the IP sender address must comply with the rules in the Access section. Default: Validate Unsolicited ARP Replies Determines how NetDefendOS will handle ARP replies that it has not asked for. According to the ARP specification, the recipient should accept these. However, because this can facilitate hijacking of local connections, it is not normally allowed. Default: DropLog ARP Requests Determines if NetDefendOS will automatically add the data in ARP requests to its ARP table. The ARP specification states that this should be done, but as this procedure can facilitate hijacking of local connections, it is not normally allowed. Even if ARPRequests is set to "Drop", meaning that the packet is discarded without being stored, NetDefendOS will, provided that other rules approve the request, reply to it. Default: Drop ARP Changes Determines how NetDefendOS will deal with situations where a received ARP reply or ARP request would alter an existing item in the ARP table. Allowing this to take place may facilitate hijacking of local connections. However, not allowing this may cause problems if, for example, a network adapter is replaced, as NetDefendOS will not accept the new address until the previous ARP table entry has timed out. Default: AcceptLog Static ARP Changes Determines how NetDefendOS will handle situations where a received ARP reply or ARP request would alter a static item in the ARP table. Of course, this is never allowed to happen. However, this setting does allow you to specify whether or not such situations are to be logged. Default: DropLog ARP Expire Specifies how long a normal dynamic item in the ARP table is to be retained before it is removed from the table. 114