5.3 + dhclient: bpf needed in kernel config?

Brooks Davis brooks at one-eyed-alien.net
Mon Nov 1 03:57:27 PST 2004

On Mon, Nov 01, 2004 at 08:48:50PM +0900, Rob wrote:
> Brooks Davis wrote:
> >On Mon, Nov 01, 2004 at 07:57:16PM +0900, Rob wrote:
> >
> >>I have left out bpf in the kernel config and
> >>all of a sudden dhclient (for DHCP) exits with an
> >>error message, complaining that bpf is not there?
> >>
> >>Since when (and why) is bpf needed by /sbin/dhclient?
> >
> >
> >bpf has always been required to run dhclient.  We'd love to see that
> >requirement go away, but we need to modify he network stack to allow
> >programs to bind to an interface with a address and no one has
> >done so yet.
> Aha. So I added bpf to my kernel config, recompiled and
> installed everything again.
> Yesterday this PC has been upgraded from 4.10 to most
> recent 5.3. I have in /etc/rc.conf
>    ifconfig_rl0="DHCP"
> which worked jsut fine with 4.10, but seems to misserably
> fail with 5.3.
> Dhclient binds rl0 to all the time, which
> seems to be a kind of default for a failing dhclient.
> Is something else, unusual, needed in 5.3, that is critical
> to dhclient?

dhclient works with GENERIC and I believe all you need is bpf.

There is no default address for dhclient so that's not your problem.
Even if there were a default it would almost certaintly be in the
Microsoft autoconfig address space which is not part of the 192.168/16
network.  It is possiable you are using an unexpired prior lease in
/var/db/dhclient.leases.  I'd tend to suspect your dhcp server or a NIC
driver bug.

-- Brooks

Any statement of the form "X is the one, true Y" is FALSE.
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