[OpenWrt-Devel] Default dhcp (client) hostname is unset - Luci implies $(hostname)

Justin Vallon justinvallon at gmail.com
Wed Oct 8 01:07:01 EDT 2014

On 10/7/14 8:46 PM, Aaron Z wrote:
> On Tue, Oct 7, 2014 at 7:02 PM, Justin Vallon <justinvallon at gmail.com> wrote:
>> So either:
>> 1) The dhcp hostname option should be blank to indicate no default value
>> (maintain current behavior)
>> 2) When udhcpc is invoked, it should pass "-H $(hostname)" in case of
>> default (make backend behave as Luci implies)
>> IMO: I find it nice that many hosts pass their hostname automatically,
>> so that the DHCP active lease list is useful, versus a lot of "?"
>> entries and ethernet addresses.  So, I would vote for 2.
>> Opinions?  Where would this bug get posted?  (wiki.openwrt.org is down,
>> so I cannot check the wiki)
> The wiki is working for me now... That info is stored on a per
> interface basis in /etc/config/network (see Link[1]) and is not set by
> default, although it may pull from /etc/config/system (see Link[2]) if
> unset in /etc/config/network.
> The default value in /etc/config/system is 'OpenWrt'
> Link[1]: http://wiki.openwrt.org/doc/uci/network#protocol.dhcp
> Link[2]: http://wiki.openwrt.org/doc/uci/system
The docs for uci network.${iface}.hostname say that there is no default
hostname submitted in the DHCP request.  However, Luci seems to imply
that the default is $HOSTNAME because it shows $HOSTNAME if the field is
unset.  Your guess ("it may pull from ...") appears to be incorrect, and
is/was my confusion as well.

Fixing Luci would seem to be straightforward (default is "").  Fixing
the backend (default is "$HOSTNAME") would be a change of behavior.  I
will look into both options.

JustinVallon at gmail.com

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