Neighbor Table Overflow & Errno:111?

["Doc" <e.net@verizon.net>]

Can someone explain what the error "neighbor table overflow" 
signifies, please?

Also, what about errno: 111?  (from X11transSocket UNIX Connect)

I don't find either in my Linux Essential References book.

My effort to load Debian on my laptop choked on these.

Thanks!  Doc