[SOLVED] can't ssh from host to guest...

[masavini]

hi,
i've just upgraded my server to ubuntu 14.04: everything works fine except for ssh connection from host to guest.

my settings:

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teo@host $ ifconfig
eth1      Link encap:Ethernet  HWaddr 20:cf:30:19:b5:ce  
          inet addr:192.168.1.4  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::22cf:30ff:fe19:b5ce/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1143689 errors:0 dropped:7 overruns:0 frame:0
          TX packets:2359406 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:374159339 (374.1 MB)  TX bytes:3129572826 (3.1 GB)

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:65536  Metric:1
          RX packets:17390 errors:0 dropped:0 overruns:0 frame:0
          TX packets:17390 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:2047225 (2.0 MB)  TX bytes:2047225 (2.0 MB)
vboxnet0  Link encap:Ethernet  HWaddr 0a:00:27:00:00:00  
          inet addr:192.168.56.101  Bcast:192.168.56.255  Mask:255.255.255.0
          inet6 addr: fe80::800:27ff:fe00:0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9898 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:1064885 (1.0 MB)

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teo@guest $ ifconfig
eth1      Link encap:Ethernet  HWaddr 08:00:27:b6:8f:39  
          inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:feb6:8f39/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1824 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1556 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:282358 (282.3 KB)  TX bytes:197473 (197.4 KB)
          Interrupt:19 Base address:0xd020 

eth2      Link encap:Ethernet  HWaddr 08:00:27:af:47:58  
          inet addr:192.168.56.101  Bcast:192.168.56.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:feaf:4758/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:113 errors:0 dropped:0 overruns:0 frame:0
          TX packets:39 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:17206 (17.2 KB)  TX bytes:5540 (5.5 KB)
          Interrupt:16 Base address:0xd240 

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:4 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:240 (240.0 B)  TX bytes:240 (240.0 B)

ssh from guest to host works fine, but if i try to connect from host to guest i'm first asked if i really want to add the RSA to the list of known hosts, then i get connected to the host itself:

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teo@host $ ssh 192.168.56.101
The authenticity of host '192.168.56.101 (192.168.56.101)' can't be established.
RSA key fingerprint is bla:bla:bla.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.56.101' (RSA) to the list of known hosts.
teo@host $

if i remove 192.168.56.101 from known_hosts, nothing changes...

how can it be?! any suggestion..?

[smithlar]

It appears that your guest is using NAT rather than Bridged as
its network mode. You can't come into a NAT, you can only
go out. (unless you also use port forwarding on the Host).

Just set your Guest to use Bridged networking in the VM's settings
and let the Guest get its own 192.... IP address from the router or
DHCP server. With Bridged, the Guest can initiate outbound
connections and the Host (and others) can initiate inbound connections.

[masavini]

i've already tried with the bridged adapter, but the vm won't start anymore... this is the errore i get:

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Failed to open a session for the virtual machine guest.
Unknown configuration node '//ssh' found in the configuration of IntNet instance #0 (VERR_CFGM_CONFIG_UNKNOWN_NODE).
> Details
Result Code: 
NS_ERROR_FAILURE (0x80004005)
Component: 
Console
Interface: 
IConsole {8ab7c520-2442-4b66-8d74-4ff1e195d2b6}

is port forwarding the only option i have? i'm not that expert in configuring ports...

[masavini]

i've finally solved with port forwarding: less pain than expected...

just added a port forwarding rule in the guest network card settings, so that connections to the host port 2222 are forwarded to guest port 22.
then i created the file ~/.ssh/config:

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Host guest
HostName 192.168.56.101
Port 2222

now i can simply connect from host to guest with the command

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ssh guest

thanks for your support!