Por que minha rede está inacessível na máquina virtual com o RHEL 7.2?

Question

Eu recebi uma avaliação de 30 dias do RHEL 7.2.

Eu instalei em uma máquina VirtualBox e tentei registrar minha assinatura:

# subscription-manager register
Registering to: subscription.rhn.redhat.com:443/subscription
Username: ***
Password: 
Network error, unable to connect to server. Please see /var/log/rhsm/rhsm.log for more information.

O log disse que houve um erro de rede:

2016-06-10 17:35:13,853 [INFO] subscription-manager:2398 @connection.py:778 - Connection built: host=subscription.rhn.redhat.com port=443 handler=/subscription auth=basic username=***
2016-06-10 17:35:13,899 [DEBUG] subscription-manager:2398 @hwprobe.py:554 - cpu info: {'cpu.cpu(s)': 1, 'cpu.core(s)_per_socket': 1, 'cpu.thread(s)_per_core': 1, 'cpu.topology_source': 'kernel /sys cpu sibling lists', 'cpu.cpu_socket(s)': 1}
2016-06-10 17:36:34,000 [DEBUG] subscription-manager:2398 @hwprobe.py:772 - Running 'virt-what'
2016-06-10 17:36:34,059 [DEBUG] subscription-manager:2398 @hwprobe.py:776 - virt-what stdout: virtualbox
kvm

2016-06-10 17:36:34,059 [DEBUG] subscription-manager:2398 @hwprobe.py:777 - virt-what stderr: 
2016-06-10 17:36:34,068 [INFO] subscription-manager:2398 @hwprobe.py:854 - collected virt facts: virt.is_guest=True, virt.host_type=virtualbox, kvm, virt.uuid=bcb0c5f9-560d-44df-b8b7-3a085d08cff5
2016-06-10 17:36:34,069 [DEBUG] subscription-manager:2398 @connection.py:475 - Loaded CA certificates from /etc/rhsm/ca/: redhat-uep.pem
2016-06-10 17:36:34,069 [DEBUG] subscription-manager:2398 @connection.py:523 - Making request: GET /subscription/users/***/owners
2016-06-10 17:37:14,122 [ERROR] subscription-manager:2398 @managercli.py:160 - Error during registration: [Errno -3] Temporary failure in name resolution
2016-06-10 17:37:14,123 [ERROR] subscription-manager:2398 @managercli.py:161 - [Errno -3] Temporary failure in name resolution

No entanto, parece ser mais do que apenas DNS. Estou usando um adaptador em ponte: Eu me conectei através do ssh. O roteador é 192.168.0.1, o host é 192.168.0.103 e o convidado é 192.168.0.100. Eu posso pingar o host do convidado:

# ping -c 1 192.168.0.103
PING 192.168.0.103 (192.168.0.103) 56(84) bytes of data.
64 bytes from 192.168.0.103: icmp_seq=1 ttl=64 time=0.342 ms

--- 192.168.0.103 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.342/0.342/0.342/0.000 ms

Mas não consigo fazer o ping do roteador. Ou qualquer outra coisa além disso.

# ping -c 1 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.

--- 192.168.0.1 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

A saída de ip route :

# ip route
default via 192.168.0.1 dev enp0s3  proto static  metric 100 
192.168.0.0/24 dev enp0s3  proto kernel  scope link  src 192.168.0.100  metric 100 

O que estou fazendo de errado?