Re: Multi-Networking in Linux - Multiple Subnets

The Natural Philosopher <[email protected]> wrote:
>On 31/07/2026 14:04, Marc Haber wrote:
>> really smart, you pick a random third octet¹ to avoid conflicts.
>> 
>Do I? Ought I? Should I? But classless routing says I do WTF I want.

everybody uses 192.168.0.0/24 or 192.168.1.0/24. Deutsche Telekom
Routers use 192.168.2.0/24. Fritzboxes use 192.168.178.0/24. I'd avoid
all of these and maybe the "easy" or "nice" numbers as 100, 200, 254,
250, 128, 192, 64, 42, 23.

You'll be happy about that once you begin building VPNs to your
friends.

But of course you're free to ignore 30 years of IP networking
experience that was sometimes painful to build. I made a couple
mistakes myself.

>> Of course it does, and it doees so correctly. 10.0.0.0/8 IS a class A
>> network, 172.16.0.0/12 IS a group of 16 class B network and
>> 192.168.0.0/16 is a group of 256 class C networks. an IP address
>> belonging to a class is determined by the first bits. IP addresses
>> starting with binary 00 and 01 belong to Class A networks
>> (0.0.0.0-127.0.0.0), IP addresses starting with binary 10 belong to
>> class B networks (128.0.0.0-191.255.0.0), and IP addresses starting
>> with 110 belong to Class C networks (192.0.0.0-223.255.255.0). There
>> used to be a class D (beginning with 111), but thankfully noone
>> remembers that.
>But you said there is no such thing as class A B or C, it's all classless..

It's all classless on today's Internet. I gave you a free history
lesson.

>Frankly arguing with you is pointless. You contradict yourself at every 
>paragraph

and you're wrong.

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