Como conectar o SSH à máquina virtual localmente sem conexão à Internet (ou modem externo)?

Question

Eu rodei o Ubuntu Desktop 16.04 como minha máquina host. Eu uso o Virtual Box para rodar o Ubuntu Server. Eu SSH para minha máquina virtual Ubuntu Server usando Rede NAT com encaminhamento de porta.

Com essas configurações, posso usar o SSH sem uma conexão real com a Internet, mas não consigo conectar o SSH com meu modem desligado.

O problema é que eu vivo no local com “cortes de energia” constantes (o que basicamente significa que a placa de eletricidade reduz a energia). Então, quando a energia disparou, embora meu laptop fique com bateria, meu modem desliga, isso quebra a conexão entre o VirtualBox e a máquina host. Eu uso um modem D-link.

Aqui está a saída de "ip addr show":

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
   valid_lft forever preferred_lft forever
inet6 ::1/128 scope host 
   valid_lft forever preferred_lft forever
2: enp7s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 34:e6:d7:80:7d:f2 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.3/24 brd 192.168.1.255 scope global dynamic enp7s0
       valid_lft 85636sec preferred_lft 85636sec
    inet6 fe80::a9a6:c6a7:8e7:86fd/64 scope link 
       valid_lft forever preferred_lft forever
3: wlp6s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether e4:f8:9c:1a:66:48 brd ff:ff:ff:ff:ff:ff
4: vboxnet0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 0a:00:27:00:00:00 brd ff:ff:ff:ff:ff:ff

Eu configuro somente a rede do host, mas ainda não consigo conectar o SSH à máquina virtual. Aqui está o erro que estou recebendo:

ssh: connect to host 192.168.56.10 port 22: No route to host

Por favor, veja as fotos abaixo para ter uma ideia melhor:

AquiestáopastebinitdaHOSTMACHINE aqui e aqui :

Name:            ubuntu-13.10-server-amd64
Groups:          /
Guest OS:        Ubuntu (64-bit)
UUID:            eef457f6-5500-4fb5-beae-a2048003eb16
Config file:     /home/hemanth/VirtualBox VMs/ubuntu-13.10-server-amd64/ubuntu-13.10-server-amd64.vbox
Snapshot folder: /home/hemanth/VirtualBox VMs/ubuntu-13.10-server-amd64/Snapshots
Log folder:      /home/hemanth/VirtualBox VMs/ubuntu-13.10-server-amd64/Logs
Hardware UUID:   eef457f6-5500-4fb5-beae-a2048003eb16
Memory size:     1024MB
Page Fusion:     off
VRAM size:       16MB
CPU exec cap:    100%
HPET:            off
Chipset:         piix3
Firmware:        BIOS
Number of CPUs:  1
PAE:             off
Long Mode:       on
Triple Fault Reset: off
APIC:            on
X2APIC:          on
CPUID Portability Level: 0
CPUID overrides: None
Boot menu mode:  message and menu
Boot Device (1): Floppy
Boot Device (2): DVD
Boot Device (3): HardDisk
Boot Device (4): Not Assigned
ACPI:            on
IOAPIC:          on
BIOS APIC mode:  APIC
Time offset:     0ms
RTC:             UTC
Hardw. virt.ext: on
Nested Paging:   on
Large Pages:     off
VT-x VPID:       on
VT-x unr. exec.: on
Paravirt. Provider: Default
Effective Paravirt. Provider: KVM
State:           powered off (since 2017-01-20T13:01:04.880000000)
Monitor count:   1
3D Acceleration: off
2D Video Acceleration: off
Teleporter Enabled: off
Teleporter Port: 0
Teleporter Address: 
Teleporter Password: 
Tracing Enabled: off
Allow Tracing to Access VM: off
Tracing Configuration: 
Autostart Enabled: off
Autostart Delay: 0
Default Frontend: 
Storage Controller Name (0):            IDE
Storage Controller Type (0):            PIIX4
Storage Controller Instance Number (0): 0
Storage Controller Max Port Count (0):  2
Storage Controller Port Count (0):      2
Storage Controller Bootable (0):        on
Storage Controller Name (1):            SATA
Storage Controller Type (1):            IntelAhci
Storage Controller Instance Number (1): 0
Storage Controller Max Port Count (1):  30
Storage Controller Port Count (1):      1
Storage Controller Bootable (1):        on
IDE (1, 0): Empty
SATA (0, 0): /media/hemanth/1f8872a7-c976-429e-b9a4-5ff4611ce1b6/Virtual_harddisk/ubuntu-13.10-server-amd64.vdi (UUID: 78d9d5a9-8aa1-4fc0-b756-69f4f9b193ae)
NIC 1:           MAC: 080027074B42, Attachment: NAT, Cable connected: on, Trace: off (file: none), Type: 82540EM, Reported speed: 0 Mbps, Boot priority: 0, Promisc Policy: deny, Bandwidth group: none
NIC 1 Settings:  MTU: 0, Socket (send: 64, receive: 64), TCP Window (send:64, receive: 64)
NIC 2:           MAC: 08002796592D, Attachment: Host-only Interface 'vboxnet0', Cable connected: on, Trace: off (file: none), Type: 82540EM, Reported speed: 0 Mbps, Boot priority: 0, Promisc Policy: deny, Bandwidth group: none
NIC 3:           disabled
NIC 4:           disabled
NIC 5:           disabled
NIC 6:           disabled
NIC 7:           disabled
NIC 8:           disabled
Pointing Device: USB Tablet
Keyboard Device: PS/2 Keyboard
UART 1:          disabled
UART 2:          disabled
UART 3:          disabled
UART 4:          disabled
LPT 1:           disabled
LPT 2:           disabled
Audio:           enabled (Driver: PulseAudio, Controller: AC97, Codec: AD1980)
Clipboard Mode:  disabled
Drag and drop Mode: disabled
VRDE:            disabled
USB:             enabled
EHCI:            disabled
XHCI:            disabled

USB Device Filters:

<none>

Bandwidth groups:  <none>

Shared folders:  <none>

Video capturing:    not active
Capture screens:    0
Capture file:       /home/hemanth/VirtualBox VMs/ubuntu-13.10-server-amd64/ubuntu-13.10-server-amd64.webm
Capture dimensions: 1024x768
Capture rate:       512 kbps
Capture FPS:        25

Guest:

Configured memory balloon size:      0 MB


Name:            ubuntu-16.04.1-server-amd64
Groups:          /
Guest OS:        Ubuntu (64-bit)
UUID:            985fda5c-3f3b-4046-a3e7-7b0f3636870e
Config file:     /home/hemanth/VirtualBox VMs/ubuntu-16.04.1-server-amd64/ubuntu-16.04.1-server-amd64.vbox
Snapshot folder: /home/hemanth/VirtualBox VMs/ubuntu-16.04.1-server-amd64/Snapshots
Log folder:      /home/hemanth/VirtualBox VMs/ubuntu-16.04.1-server-amd64/Logs
Hardware UUID:   985fda5c-3f3b-4046-a3e7-7b0f3636870e
Memory size:     1024MB
Page Fusion:     off
VRAM size:       16MB
CPU exec cap:    100%
HPET:            off
Chipset:         piix3
Firmware:        BIOS
Number of CPUs:  1
PAE:             off
Long Mode:       on
Triple Fault Reset: off
APIC:            on
X2APIC:          on
CPUID Portability Level: 0
CPUID overrides: None
Boot menu mode:  message and menu
Boot Device (1): Floppy
Boot Device (2): DVD
Boot Device (3): HardDisk
Boot Device (4): Not Assigned
ACPI:            on
IOAPIC:          on
BIOS APIC mode:  APIC
Time offset:     0ms
RTC:             UTC
Hardw. virt.ext: on
Nested Paging:   on
Large Pages:     off
VT-x VPID:       on
VT-x unr. exec.: on
Paravirt. Provider: Default
Effective Paravirt. Provider: KVM
State:           running (since 2017-01-20T13:01:35.359000000)
Monitor count:   1
3D Acceleration: off
2D Video Acceleration: off
Teleporter Enabled: off
Teleporter Port: 0
Teleporter Address: 
Teleporter Password: 
Tracing Enabled: off
Allow Tracing to Access VM: off
Tracing Configuration: 
Autostart Enabled: off
Autostart Delay: 0
Default Frontend: 
Storage Controller Name (0):            IDE
Storage Controller Type (0):            PIIX4
Storage Controller Instance Number (0): 0
Storage Controller Max Port Count (0):  2
Storage Controller Port Count (0):      2
Storage Controller Bootable (0):        on
Storage Controller Name (1):            SATA
Storage Controller Type (1):            IntelAhci
Storage Controller Instance Number (1): 0
Storage Controller Max Port Count (1):  30
Storage Controller Port Count (1):      1
Storage Controller Bootable (1):        on
IDE (1, 0): Empty
SATA (0, 0): /media/hemanth/1f8872a7-c976-429e-b9a4-5ff4611ce1b6/Virtual_harddisk/ubuntu-16.04.1-server-amd64.vdi (UUID: 52e25a62-bef7-41df-a04b-06b90d2f36e5)
NIC 1:           MAC: 0800276260D8, Attachment: NAT, Cable connected: on, Trace: off (file: none), Type: 82540EM, Reported speed: 0 Mbps, Boot priority: 0, Promisc Policy: deny, Bandwidth group: none
NIC 1 Settings:  MTU: 0, Socket (send: 64, receive: 64), TCP Window (send:64, receive: 64)
NIC 1 Rule(0):   name = ssh, protocol = tcp, host ip = 192.168.1.3, host port = 2000, guest ip = 10.0.2.15, guest port = 22
NIC 2:           MAC: 080027354E37, Attachment: Host-only Interface 'vboxnet0', Cable connected: on, Trace: off (file: none), Type: 82540EM, Reported speed: 0 Mbps, Boot priority: 0, Promisc Policy: deny, Bandwidth group: none
NIC 3:           disabled
NIC 4:           disabled
NIC 5:           disabled
NIC 6:           disabled
NIC 7:           disabled
NIC 8:           disabled
Pointing Device: USB Tablet
Keyboard Device: PS/2 Keyboard
UART 1:          disabled
UART 2:          disabled
UART 3:          disabled
UART 4:          disabled
LPT 1:           disabled
LPT 2:           disabled
Audio:           enabled (Driver: PulseAudio, Controller: AC97, Codec: AD1980)
Clipboard Mode:  disabled
Drag and drop Mode: disabled
Session name:    GUI/Qt
VRDE:            disabled
USB:             enabled
EHCI:            disabled
XHCI:            disabled

USB Device Filters:

<none>

Bandwidth groups:  <none>

Shared folders:  <none>

Video capturing:    not active
Capture screens:    0
Capture file:       /home/hemanth/VirtualBox VMs/ubuntu-16.04.1-server-amd64/ubuntu-16.04.1-server-amd64.webm
Capture dimensions: 1024x768
Capture rate:       512 kbps
Capture FPS:        25

Guest:

Configured memory balloon size:      0 MB

IP4.ADDRESS[1]:                         192.168.1.3/24
IP4.ADDRESS[1]:                         192.168.56.1/24
IP4.ADDRESS[1]:                         127.0.0.1/8

Aqui está o pastebinit da GUEST MACHINE, aqui :

IP4.ADDRESS[1]:                         10.0.2.15/24
IP4.ADDRESS[1]:                         127.0.0.1/8