Хорошо, я пытаюсь разбить свой предыдущий вопрос на части:

Это моя ссылка: https://help.ubuntu.com/community/SSH_VPN

tunneling ubuntu -> debian

1.
ssh -i green.pem [email protected]$HOST

echo 1 | tee /proc/sys/net/ipv4/ip_forward
echo "PermitTunnel yes" > /etc/ssh/sshd_config
/etc/init.d/ssh restart
ctrl-d logout

2.
sudo ssh -i green.pem [email protected]$HOST -w 0:0 -o Tunnel=ethernet
** logs in, no errors

ifconfig
there is no tap0 or tun0 interface

ip addr show tun0
Device "tun0" does not exist

Должен ли быть интерфейс на этом этапе?


В ответ на комментарий:

dmesg on remote server:


[    5.451753] EXT3 FS on xvda1, internal journal
[   16.648023] eth0: no IPv6 routers present
[   84.265352] tun: Universal TUN/TAP device driver, 1.6
[   84.265370] tun: (C) 1999-2004 Max Krasnyansky 
[email protected]:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 12:31:39:09:58:ea  
          inet addr:10.210.95.24  Bcast:10.210.95.255  Mask:255.255.254.0
          inet6 addr: fe80::1031:39ff:fe09:58ea/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:130 errors:0 dropped:0 overruns:0 frame:0
          TX packets:140 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:17963 (17.5 KiB)  TX bytes:29931 (29.2 KiB)
          Interrupt:247 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
dmesg on local client:


[   22.739732] vboxpci: IOMMU not found (not registered)
[   24.475348] init: plymouth-stop pre-start process (1569) terminated with status 1
[   31.280027] eth0: no IPv6 routers present

для комментария:

tail f /var/log/syslog 

...

Mar 23 02:23:40 domU-12-31-39-13-01-D4 kernel: [   54.188044] eth0: no IPv6 routers present
Mar 23 02:24:27 domU-12-31-39-13-01-D4 kernel: [  101.646030] tun: Universal TUN/TAP device driver, 1.6
Mar 23 02:24:27 domU-12-31-39-13-01-D4 kernel: [  101.646046] tun: (C) 1999-2004 Max Krasnyansky 



[email protected]:~# tail /var/log/faillog  
[email protected]:~# 

tail /var/log/auth.log
Mar 23 02:24:35 domU-12-31-39-13-01-D4 sshd[760]: Accepted publickey for root from XXXXXXX port 59391 ssh2

на стороне клиента

syslog seems interesting

(i did try multiple times)


Mar 22 22:24:27 red NetworkManager[765]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/tap0, iface: tap0)
Mar 22 22:24:27 red NetworkManager[765]:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/tap0, iface: tap0): no ifupdown configuration found.
Mar 22 22:24:27 red NetworkManager[765]:  /sys/devices/virtual/net/tap0: couldn't determine device driver; ignoring...
Mar 22 22:24:33 red NetworkManager[765]:    SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/tap0, iface: tap0)
Mar 22 22:24:35 red NetworkManager[765]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/tap0, iface: tap0)
Mar 22 22:24:35 red NetworkManager[765]:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/tap0, iface: tap0): no ifupdown configuration found.
Mar 22 22:24:35 red NetworkManager[765]:  /sys/devices/virtual/net/tap0: couldn't determine device driver; ignoring...
Mar 22 22:30:56 red NetworkManager[765]:    SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/tap0, iface: tap0)



answer

ifconfig -a показывает интерфейс.

Вам нужно использовать, -aчтобы увидеть неработающие интерфейсы. ifconfigтолько показывает только подключенные интерфейсы.