/etc/netstart may attempt to execute unwanted hostname.xxx
	files.  This has variuos effects, from none to wedging the
	system.  The specific problem is that the line:

	ifn=`expr $i : '/etc/hostname\.\(.*\)'`

	will return the end of ANY filename starting with "/etc/hostname."
	Eg., if one copies hostname.ed0 to hostname.ed0.HIDE netstart will
	evaluate it anyway.  I was bitten by an emacs backup file (ie,
	hostname.ed0~)

Fix: 

edit /etc/netstart:

< 	ifn=`expr $i : '/etc/hostname\.\(.*\)'`
---
> 	ifn=`expr $i : '/etc/hostname\.\(.*[0-9]$\)'`

The above fix was not ideal, instead use a variable as a list of
interfaces and a set of variables, one per interface to contain
the data.  Totally eliminate the /etc/hostname.* files.
How-To-Repeat: 
	use emacs to edit hostname.ed0, changing some vital field.
	Reboot the kernel.  netstart will attempt to run ifconfig on both
	hostname.ed0 AND hostname.ed0~