What? Packet injection as in spoofing? Arping is a method of faking a response as to which machine owns an IP address. It's commonly used to create a "man in the middle" type of security nightmare. If this is what you're planning to do, please turn yourself in to the nearest federal anti-terrorism agency for re-education in proper use of internet protocols.
First, check if ARP decoding is enabled. Analyze -> Enabled Protocols -> ARP
You can generate an ARP request by pinging a new IP address on your LAN. It doesn't have to be a real device, just one that's not in the current arp cache: arp -a Yep. It works. Just ping any IP non-existant address in your Class C IP LAN block.
Frame 2 (54 bytes on wire, 54 bytes captured) Ethernet II, Src: 00:02:b3:1e:39:ed, Dst: 00:0c:41:71:36:30 Internet Protocol, Src Addr: 192.168.1.10 (192.168.1.10), Dst Addr:220.127.116.11 (18.104.22.168) Transmission Control Protocol, Src Port: 1068 (1068), Dst Port: http (80), Seq: 0, Ack: 1, Len: 0
No. Time Source Destination Protocol Info 3 4.503801 192.168.1.10 Broadcast ARP Who has 192.168.1.99? Tell 192.168.1.10