In message <20021124231608.GW17591@mewburn.net>, Luke Mewburn writes:
>On Fri, Nov 22, 2002 at 10:57:18AM -0500, Steve Bellovin wrote:
>  | I want to ensure that dhclient only runs on certain interfaces, to 
>  | prevent it from overwriting the static address for vmnet1.  I can't set 
>  | dhclient_flags, because wi0 is sometimes present and sometimes not.  
>  | Instead, I wrote the following script, which I put into
>  | /etc/rc.conf.d/dhclient (though it could -- should? -- go into
>  | /etc/rc.d/dhclient.
>
>There's an easier way; just list the interfaces you want dhclient to
>attempt to use in /etc/dhclient.conf.  For example, on my laptop I have:
>
>	interface "wi0" {
>		media "-mediaopt adhoc nwid SOMETHING nwkey SOMETHINGELSE";
>		media "-mediaopt adhoc nwid '' -nwkey";
>		media "mediaopt adhoc -nwkey";
>	}
>
>	interface "tlp0" {
>	}
>
>dhclient only tries wi0 (if present), cycling through the media
>options on each retry, and tlp0 (if present); it doesn't try other 
>"broadcast capable" interfaces that may be available.
>
>I'd be curious to know if this solution works for you or not.
>

Hmm...  I haven't tried that lately; last time I tried it, it objected 
if wi0 didn't exist.  But it's certainly worth another try.  (Also note 
that one of my goals is to ensure that vmnet1 is never tried.)

		--Steve Bellovin, http://www.research.att.com/~smb (me)
		http://www.wilyhacker.com ("Firewalls" book)