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Description of problem:

According to RFC1122, Section 3.2.1.3, the `0.0.0.0/8` should never been used
as route destination.

It might be typo of `0.0.0.0/0` (IPv4 default gateway).


Version-Release number of selected component (if applicable):
nmstate-2.1.1-0.alpha.20220519.437e4a9.el9

How reproducible:
100%

Steps to Reproduce:
1.  echo '---
interfaces:
  - name: eth1
    type: ethernet
    state: up
    ipv4:
      address:
      - ip: 192.0.2.251
        prefix-length: 24
      dhcp: false
      enabled: true

routes:
  config:
  - destination: 0.0.0.0
    next-hop-address: 192.0.2.1
    next-hop-interface: eth1' | sudo nmstatectl set
2.
3.

Actual results:

Nmstate fail with VerificationError due to bug 2091457

Expected results:

Raise invalid argument error indicate 0.0.0.0/8(and its subnet) cannot be used
as route destination, might be a typo of default gateway `0.0.0.0/0`.

Additional info:

Verified with:
nmstate-2.2.5-1.el9.x86_64
nispor-1.2.9-1.el9.x86_64
NetworkManager-1.41.90-1.el9.x86_64
DISTRO=RHEL-9.2.0-20230127.12

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (nmstate bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:2190