D-Link DFL-260E User Manual for DFL-260E - Page 130
Using ARP Advanced Settings, Publishing Entire Networks, Multicast and Broadcast
View all D-Link DFL-260E manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 130 highlights
3.5.4. Using ARP Advanced Settings Chapter 3. Fundamentals These are shown in the illustration below of an Ethernet frame containing an ARP response: Figure 3.2. An ARP Publish Ethernet Frame The Publish option uses the real MAC address of the sending interface for the address (1) in the Ethernet frame. In rare cases, some network equipment will require that both MAC addresses in the response (1 and 2 above) are the same. In this case XPublish is used since it changes both MAC addresses in the response to be the published MAC address. In other words, XPublish "lies" about the source address of the ARP response. If a published MAC address is the same as the MAC address of the physical interface, it will make no difference if Publish or XPublish is selected, the result will be the same. Publishing Entire Networks When using ARP entries, IP addresses can only be published one at a time. However, the administrator can use the alternative Proxy ARP feature in NetDefendOS to handle publishing of entire networks (see Section 4.2.6, "Proxy ARP"). 3.5.4. Using ARP Advanced Settings This section presents some of the advanced settings related to ARP. In most cases, these settings need not to be changed, but in some deployments, modifications might be needed. A summary of all ARP advanced settings can be found in the next section. Multicast and Broadcast ARP requests and ARP replies containing multicast or broadcast addresses are usually never correct, with the exception of certain load balancing and redundancy devices, which make use of hardware layer multicast addresses. The default behavior of NetDefendOS is to drop and log such ARP requests and ARP replies. This can, however, be changed by modifying the advanced settings ARP Multicast and ARP Broadcast. 130