System doesn't detect unplugged network cable and doesn't set interface up properly with DHCP

[Brooks Davis]

On Fri, Jul 13, 2012 at 08:41:23AM -0400, John Baldwin wrote:
> [ Adding Brooks, IIRC, he imported the current dhclient ]
> 
> On Friday, July 13, 2012 5:48:30 am Peter Jeremy wrote:
> > On 2012-Jul-12 13:41:39 -0700, Yuri <yuri at rawbw.com> wrote:
> > >I have the simplest possible DHCP setup: ifconfig_re0="DHCP" in 
> > >/etc/rc.conf.
> > >
> > >When the system boots, it gets connected fine.
> > >
> > >Now,  I disconnect my laptop and connect it to another network.
> > >When cable is disconnected, IP address of this interface stays the same, 
> > >old one is not removed.
> > >When I plug it into another network, the same IP address stays. New IP 
> > >doesn't get set. This is bad.
> > >So I have to manually do 'ifconfig re0 down && remove <OLD-IP> && 
> > >ifconfig re0 up'.
> > 
> > This is a bug in dhclient - see PR bin/166656, which includes a fix.
> 
> I think this is the correct answer.  Brooks, can you look at the PR and patch?  
> If you are busy I can commit it if you give the ok.

That seems fine to me.  Feel free to commit.

-- Brooks
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