Re: Default route doesn't change to wireless device (ath0)

> Date: Thu, 1 Sep 2005 15:36:33 -0700
> From: Brooks Davis <brooks_at_one-eyed-alien.net>
> 
> 
> On Thu, Sep 01, 2005 at 02:43:57PM -0700, Jon Dama wrote:
> > If the start_if.ath0 script isn't running, you should check that you have
> > removable_interfaces="ath0" in rc.conf.  Though, I saw some traffic that
> > say this was going away.
> 
> Yup, it's dying.
> 
> > Anyway, quoting Brooks in "HEADSUP: OpenBSD dhclient incoming"
> > "Second the pccard_ifconfig variable is only used as a default value for
> > interfaces that are on the removable_interfaces list, but do not have an
> > ifconfig_<if> variable. Third, interfaces must be on the
> > removable_interfaces list for pccard_ether to work."
> 
> This is now wrong.  I've nuked the pccard_ifconfig and added an
> ifconfig_DEFAULT variable which applies to all interfaces that don't
> have ifconfig_<ifn> variables (actually, it applies to those with empty
> ones as well at this point which is probably a bug.)
> 
> > There should not be a need to modify devd.conf as there is already this
> > line:
> > 
> > attach 0 {
> >         device-name "$ethernet-nic-regex";
> >         action "/etc/pccard_ether $device-name start";
> > }
> > 
> > The regex does cover ath0, and pccard_ether should handle the event if the
> > interface is listed in removable_interfaces
> 
> We've actually done away with the regex in HEAD and are using interface
> types so anything should work now.
> 
> > I also saw some traffic from Brooks where he explicitly stated that
> > the new dhclient does not touch the default route if one is already
> > configured.  afaik, this should not actually be a problem because start_if
> > is always run before dhclient has a change to start.  Also I agree, it
> > would rather dangerous if dhclient just started flushing the routing
> > table.
> 
> If you want to forcably set the default route via dhclient, you can do
> it via /etc/dhclient-exit-hooks which is executed when dhclient-script
> exits or you could write code to unset the current default route if the
> interface is down and put it in /etc/dhclient-enter-hooks.
> 
> > Incidentially, I've seen this topic come up a dozen times + never knew
> > what do myself until Nate Lawson pointed me in the right direction a year
> > ago.  At that time, he remarked that this stuff isn't documented any where
> > + it really should be in the handbook.
> > 
> > Can someone point me to where I should look for information on how to
> > contribute to the handbook in a format that is likely to be accepted?
> >
> > This is such a standard thing to want, it has to be done!
> 
> You're probably looking for the doc project primer.
> 
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/fdp-primer/index.html
> 
> We're hoping to make route handling a bit more flexable in dhclient, but
> I haven't had time to work on it yet.
> 
> -- Brooks
> 
> > -Jon
> > 
> > On Thu, 1 Sep 2005, Kevin Oberman wrote:
> > 
> > > > Date: Thu, 1 Sep 2005 13:01:38 -0700 (PDT)
> > > > From: Jon Dama <jd_at_ugcs.caltech.edu>
> > > > Sender: owner-freebsd-current_at_freebsd.org
> > > >
> > > > Flush the routing table or at least delete the default entry in a
> > > > start_if.ath0 script.
> > >
> > > This is obvious, but does not answer the question: "Can't that be done
> > > automatically on plugging in either?"
> > >
> > > As I recall, when the OpenSSH dhclient was added, one of the things it
> > > was supposed to do was flush the routing table. This never seems to have
> > > happened and I'm not sure I'd want it to.
> > >
> > > Maybe devd could automate it? (I think I'm going to try that.)
> > > --
> > > R. Kevin Oberman, Network Engineer
> > > Energy Sciences Network (ESnet)
> > > Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
> > > E-mail: oberman_at_es.net			Phone: +1 510 486-8634
> > >
> > >
> > > > On Thu, 1 Sep 2005, Jochen Gensch wrote:
> > > >
> > > > > Hi!
> > > > >
> > > > > If I plug in my wireless nic (atheros) it comes up automatically th> rough
> > > > > wpa_supplicant. However the default route still points to my non wi> reless
> > > > > nic (fxp0) even if remove the network cable before plugging in the > wireless
> > > > > device. I have found no way around this, the only way of getting the
> > > > > default route changed to ath0 is setting in manually. Can't that be>  done
> > > > > automatically on plugging in either?
> > >
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Thank you, Brooks! 

I had entirely forgotten the dhclient hooks. This will make it easy to
do what I want. (I use Tobias Roth's profile, which allows files to be
selected based on where I am when I boot my system.)
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman_at_es.net			Phone: +1 510 486-8634