Destination always is 192.168.1.255

On my mac, when connected to my wireless, I was able to see the source ip/host and the destination ip, or host. the outgoing sites were always reported via ip or host. All was well.

Now recently, i am seeing all the source ips on my network showing destination as 192.168.1.255. When I test it by having one wireless client go to Facebook for example, it will show the 192.168.1.255 instead of Facebook host etc.

what did I do? maybe playing with settings in wireshark, how to reset to default?

Thanks