Linux's "ip route" not shows the route for dev lo

Question

Ubuntu 20. I do

ip -4 route add local 172.20.30.0/24 dev lo

It's OK. Again - I got

RTNETLINK answers: File exists

This is OK.

But 'ip route' not shows this rule, neither 'netstat -rn', neither 'route -en'.

Where can I view this rule?

Answer 1

The lo interface is a virtual interface. It's only purpose is to return all the packets it receives.

You may check the routing table associated with it using the command:

ip route show table local

This way you will be able to check if the route you are trying to add is actually there.