Comment 7 for bug 1840904

looking at the test it appears that there are several factors hard coded into it.

    def determine_underlay(self):
        underlay = 'bogus'
        cmd = 'ip address'
        output = utils.system_output(cmd, retain_output=False)
        for line in output.split('\n'):
            m = re.search('inet (\d+\.\d+)\.\d+\.\d+\/\d+ brd \d+\.\d+\.\d+\.\d+ scope', line)
            if m:
                underlay = '%s.0.0/16' % m.group(1)
                break
        return underlay

This may be the problem overall and possibly not the right way to approach this, The underlay network should probably be the default routable network. Not every network is a /16 , will take a look to see if I can refactor this a bit.