On 07/02/18 14:29, Brian wrote: > On Tue 06 Feb 2018 at 20:23:13 -0500, Michael Stone wrote: > >> On Wed, Feb 07, 2018 at 01:16:28AM +0000, Brian wrote: >>> On Tue 06 Feb 2018 at 19:53:16 -0500, Michael Stone wrote: >>> >>>> On Tue, Feb 06, 2018 at 11:00:12PM +0000, Brian wrote: >>>>> On Tue 06 Feb 2018 at 17:06:36 -0500, Gene Heskett wrote: >>>>>> On Tuesday 06 February 2018 14:07:55 Brian wrote: >>>>>>> >>>>>>> 1. auto enp0s25 >>>>>>> iface enp0s25 inet >>>>>>> static address 192.168.0.202 >>>>>>> netmask 255.255.255.0 >>>>>>> gateway 192.168.0.1 >>>>>>> network 192.168.0.0 >>>>>>> >>>>>>> netmask and network are not needed. ifupdown will compute them. Note >>>>>>> there are no examples in interfaces(5) which use these parameters. >>>>>>> >>>>>> You should go and read that man page again. >>>>> >>>>> I didn't have to but I did. A line beginning "netmask" is not required". >>>> >>>> If you don't specify a netmask it will default to something that was >>>> correct >>>> in the 80s and is probably wrong on your network. The "netmask line" isn't >>>> required, but if you don't have a netmask line you should specify the >>>> netmask in the address line (using "ip/netmask" syntax). >>> >>> Indeed. But a netmask line (while not necessary) doesn't do any harm. >> >> More than that: either a separate netmask entry or a netmask specified as >> part of the address are almost certainly required for proper operation. It's >> not technically required, but it is practically required. > > The changelog says: > > * Calculate netmask internally, so even if a user haven't supplied > one or have used CIDR notation, hook scripts will have it properly > specified in IF_NETMASK environment variable. > > What is the significance of "...so even if a user haven't supplied ..."?
Calculate how? Using ancient classful addressing rules? Sounds like that change is a bug, to me. Lack of a mask or prefix length should trigger an error. Richard
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