Bug in autofs, it refuses to create /media/net for some reason. It will happily create many other directories though, so if you find out WHY it does not do as it's supposed to, it'd be good to file a bug report for the autofs folks.
irc, autofs can't 'share' the master mountpoint, in your case /media/net, as autofs needs this to be a mountpoint not a standard folder when using the --ghost option.
for this reason in oe-aliance we use '/media/autofs' if you run a 'mount' command in telnet you will see that /media/autofs is indeed a mount point, this means you can't have fstab and autofs mounting to the same location.
also we tweaked the standard config file to work better with offline servers, you are welcome to use our files.
https://github.com/o...-daemons/autofs