08-Aug-2015, 07:08
(This post was last modified: 08-Aug-2015, 07:11 by Rufus McDufus.)
It might be something to do with multicast (IGMP). Device discovery is usually done by sending out IGMP messages and waiting for a response from one or more devices on the network. It could be the laptop is blocked from sending out IGMP, or maybe from receiving the acknowledgement somehow.