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Re: Ethernet is not started at boot




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 Firstly, it's decades out of
date, and secondly, that range was never in the class B section.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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