feature request: bound interface

[ruokeqx]

is it possible to provide some method to bind interface like ping do?

ping [-AaCDdfnoQqRrv] [-b boundif] 
     -b boundif
             Bind the socket to interface boundif for sending.  This option is an Apple addition.

use control function in ListenConfig is one option, but may need change x/icmp to net.ListenConfig