arping just like ping and netselect uses RAW sockets to work. iputils (ping) supports both the suid and the filecaps USE flags allowing unprivileged users to execute ping with the option of using file system capabilities (cap_net_raw+ep) instead of the suid bit arping doesn't have these USE flags and users only have the option to switch to root in order to execute it (which is a greater risk than the suid bit most of the time)
Added in -r3.
Thank you !
