On 07/02/18 23:58, Erik Christiansen wrote: > 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. Please don't use "class B" to mean /16. Firstly, it's decades out of date, and secondly, that range was never in the class B section. All it does is add confusion. Better never to refer to classes at all. Richard
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