On Wed, 30 Jun 2004 13:02:16 +0200 (CEST)
Jaap Keuter [off-list ref] wrote:

Digging a bit deeper revealed that it actually is an issue with
SIOIFNETMASK. Once you bring up an interface with SIOIFADDR, a classfull
netmask and broadcast address is set (if applicable for the type of
interface), in order to get a properly configured interface. But if you
subnet the network using SIOIFNETMASK no proper broadcast address is
set. So you always have to calculate it yourself, obviously leading to
configuration errors.

Indeed that's odd behavior.  I like this patch and will apply it
to my trees.

Thanks.