![]() However, it can be useful as part of a larger filter string. Filtering only on ARP packets is rarely used, as you wont see any IP or other packets. Then look for that mac address on your network (for finding out the vendor OUI for that mac-address, visit. A complete list of ARP display filter fields can be found in the display filter reference. To find the device with the IP address 192.168.178.100, you can disable WiFi on the iPad and then ping 192.168.178.100 and look at the ARP entry for it in your ARP table. So the root cause is a duplicate address on the network that should be resolved by the DHCP-DECLINE messages, but because of the BUG on the DHCP server, it prevents the iPad from getting an IP address. This is a BUG in the DHCP server as far as I can tell. When you start typing, Wireshark will help you autocomplete your filter. The DHCP-DECLINE message should tell the DHCP server to NOT hand out this address anymore, but the DHCP server keeps handing out this address to the iPad. For example, type dns and you’ll see only DNS packets. I do not see responses to the ARP probes, but based on the DHCP-DECLINE, I assume there was another device on the network that is using the address 192.168.178.100 which sent ARP responses directly to the iPad. Then looking at DHCP and ARP traffic to/from the mac-addess of the iPad (filter on eth.addr = c4:c3:6b:0e:dd:e2 & (dhcp || arp)), I can see that the iPad declines the use of the offered address. If the filter bar is green, the expression has been accepted, and it should work properly, as shown below in Figure 4. Type http.request in the display filter and hit Enter. Open our first pcap named Wireshark-tutorial-filter-expressions-1-of-5.pcap in Wireshark. In your trace I see DHCP requests from the mentioned iPad (filter on = "Abids-iPad"). Note the filter bar’s red color in Figure 3.
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