On 07.02.18 09:33, Michelle Konzack wrote: > Good morning, > > Am 2018-02-07 hackte Gene Heskett in die Tasten: > > 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. > > Who do you mean? > > I have als a network with > > auto eth2 > iface eth2 inet static > address 192.168.4.12 > netmask 255.255.127.0 > gateway 192.168.4.1 > network 192.168.4.0 > > So, it is not so good idea to leafe it out
Michelle, that netmask is 0b11111111111111111000000100000000 , which is the first I have ever seen with a hole in it. For 512 addresses, I'd have expected 255.255.254.0, which has contiguous bits: 0b11111111111111111111111000000000 (If 10 bits (1024 addresses) were the aim, then it would be 252, but never 127, if I have any kind of grip on this stuff.) Not trusting the software to handle an unusual netmask, I might have been tempted to just use a class B netmask, 255.255.0.0 , but then I can be a Feigling in such matters. Erik
