Difference between loopback and dummy interfaces for use in Linux routing

[Alexander Demenshin]

On 2018-04-27 12:59, Alexander Zubkov wrote:

> One of the differences is when you configure some prefix on lo you get
> route like this:
> local 127.0.0.0/8 [1] dev lo ...
> And with dummy it is not the case.

It could be done manually with any interface, actually:

# ip route add local 192.168.128.0/24 dev dummy table local

And you don't even need to add address from this range to the interface,
or bring it up - just a route is enough to make the system respond
to (or bind to) the whole range (unless, of course, there are firewall
or other explicit restrictions).

Best regards,
Alexander.