Comment 1 for bug 1741456

I don't know how DVR works or what does change in the network setting, but you can redefine proxy_command from sahara.conf. Check sahara/utils/remote.py:

    cfg.StrOpt('proxy_command', default='',
               help='Proxy command used to connect to instances. If set, this '
               'command should open a netcat socket, that Sahara will use for '
               'SSH and HTTP connections. Use {host} and {port} to describe '
               'the destination. Other available keywords: {tenant_id}, '
               '{network_id}, {router_id}.'),