[SOLVED] How to combine 3 linux servers into one subnet without switches?

Question

linux

Good afternoon!
Given: 3 identical servers running linux
Each server has 2 free network cards
Task:
Combine servers into one subnet (for example, server1 - 10.0.0.1; server2 - 10.0.0.2; server3 - 10.0.0.3)
The use of switches is undesirable
Conditions:
The failure of any one server does not lead to a communication failure between the remaining two.
Thanks in advance for your valuable advice.

Answer 1

Some kind of unhealthy fantasy, but use brctl + stp, connect the servers with a ring

Answer 2

Without switches, of course, it is possible, it will only be disgusting, we ourselves will connect the servers to each other, a-b-c-a, just two connections to each server. But how to connect to this cluster outside?!
Put two switches, one on the cluster network, the second on the external one, each server with one adapter in one switch, the second in the second. Better yet, add 10ge adapters for the cluster, and bond on the rest of the interfaces.
As for glusterfs, it's strange, very, gone from it ... We use ceph rbd, the installation is not much more complicated than glaster, and everything else is much better. One minus, you don’t need to map rbd devices on nodes, work through librbd directly, or through kvm for example. If you really need to connect rbd as a block device, do it from clients outside the cluster!

Answer 3

Or openvswitch. Its configuration is more like configuring a conventional switch.

Answer 4

It looks more like a theoretical problem at the rate of networks, since there is no great practical sense when banning switches and such introductory conditions.
To do so without software is an elementary thing, both under linux and under windows.
The TCP/IP Tutorial and Technical Overview (IBM Redbooks) provides information on what should be included in the response.
PS juffinhalli are you currently taking an exam or are you sitting for an interview? :)