Q. How can I run ntop without being root?
A. A very simple way of doing this is:
   > su
   > chown root ntop  
   > chgrp root ntop
   > chmod 6111 ntop
   > exit

Q. I can't run ntop on BSD systems. The error is:
   ntop: /dev/bpf0: Device not configured
A. This is because bfp0 has not been configured inside the generic
   kernel config file. If you use generic kernel config file put
   pseudo-device bpfilter 16
   to kernel config file and rebuild the kernel.

Q. ntop doesn't report any traffic at all.
A. Please make sure that there's traffic on the interface you're using. You
   can select an interface using the '-i' flag.

Q. Where can I find pthreads for IRIX 6.2?
A. Irix 6.2 doesn't support POSIX threads out of the box. You must 
   install the patch: 2791

Q. Where can I find lsof?
A. You can download lsof from 
   ftp://vic.cc.purdue.edu/pub/tools/unix/lsof

Q. How do I force configure to build ntop without
   lsof support?
A. configure -enable-lsof=no

Q. How do I force configure to build ntop without
   thread support?
A. configure -enable-threads=no

Q. How do I install the ntop package on Solaris?
   For instance do 'pkgadd -d ntop-1.1-solaris.i386'