Hi,
I am going to do a little network diag to see what we can do for you here in this forum, but I might move this to the network forum.
Can you tell me what brand and model of wireless router you have? Do you have any computers connected via ethernet cable too?
I would like to know what happens when you enter this into terminal:
Also, I would like you to enter
Lets start there and then go from there.
Cheers!