How to configure putty to ssh to multiple vm using same host

chakra1 · 11-29-2013, 10:55 PM

I am running two Hortonworks Sandbox 1.3 guest VMs (both running Centos 6) on a Windows 7 host. I am using Oracle VirtualBox 4.3.2 with host-only adapter added to each of the guest VMs in addition to their default NAT adapter. I have enabled DHCP server in Preferences --> Network --> Host-only Networks --> DHCP Server with specifications as follows:

Code:

Enable Server: Checked
Server Address: 192.168.56.100
Server Mask: 255.255.255.0
Lower Address Bound: 192.168.56.101
Upper Address Bound: 192.168.56.254

On launching both the guest VMs, it says that the guest can be SSHed on 127.0.0.1:2222 I want to use putty SSH client to open terminals for the two different guest VMs. But the problem is I can only SSH successfully to the 127.0.0.1:2222 in either new connection. This restricts me to SSH to only a single guest instance at present.

How should I create two different SSH connections using my putty client for the two guest VMs?

Code:

Wireless LAN adapter Wireless Network Connection:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) Centrino(R) Wireless-N 1030
   Physical Address. . . . . . . . . : XX-XX-XX-XX-XX-X1
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : xxNN::NNNN:NNxN:xNNN:xxNN%11(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.1.2(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Friday, November 29, 2013 3:14:48 PM
   Lease Expires . . . . . . . . . . : Saturday, November 30, 2013 3:14:52 PM
   Default Gateway . . . . . . . . . : 192.168.1.1
   DHCP Server . . . . . . . . . . . : 192.168.1.1
   DHCPv6 IAID . . . . . . . . . . . : NNNNNNNN0
   DHCPv6 Client DUID. . . . . . . . : NN-NN-NN-NN-NN-XX-XN-XN-NN-XN-XX-NN-XX-X0

   DNS Servers . . . . . . . . . . . : 192.168.1.1
   NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter VirtualBox Host-Only Network:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : VirtualBox Host-Only Ethernet Adapter
   Physical Address. . . . . . . . . : XX-XX-XX-XX-XX-X2
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : xxNN::xN:NNNN:xNNN:NxxN%24(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.56.1(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . :
   DHCPv6 IAID . . . . . . . . . . . : NNNNNNNN1
   DHCPv6 Client DUID. . . . . . . . : NN-NN-NN-NN-NN-XX-XN-XN-NN-XN-XX-NN-XX-X1

   DNS Servers . . . . . . . . . . . : xxxN:N:N:xxxx::1%1
                                       xxxN:N:N:xxxx::2%1
                                       xxxN:N:N:xxxx::3%1
   NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter VirtualBox Host-Only Network #2:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : VirtualBox Host-Only Ethernet Adapter #2
   Physical Address. . . . . . . . . : XX-XX-XX-XX-XX-X3
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : xxNN::xxxN:NNNN:xNxx:NNNx%26(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.43.1(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . :
   DHCPv6 IAID . . . . . . . . . . . : NNNNNNNN2
   DHCPv6 Client DUID. . . . . . . . : NN-NN-NN-NN-NN-XX-XN-XN-NN-XN-XX-NN-XX-X2

   DNS Servers . . . . . . . . . . . : xxxN:N:N:xxxx::1%1
                                       xxxN:N:N:xxxx::2%1
                                       xxxN:N:N:xxxx::3%1
   NetBIOS over Tcpip. . . . . . . . : Enabled

My scenario is best described through the attached image with this thread. Or is that my understanding of the network architecture is mistaken? Can somebody please explain and help me get SSH access to the two guest VMs.

rigor · 11-30-2013, 06:29 PM

Hi chakra1,

I'm not entirely clear on your explanation of your set up. But I have used various versions of VirtualBox successfully.

Using a Host-Only adapter I would normally get an IP address in the same subnet for both the guest and the host. For the VirtualBox I have running right now, the adapter on the Linux side is vboxnet0 with an IP address of 192.168.56.1, while on the Windows side it's "Ethernet adapter Local Area Connection 2" with an IP address of 192.168.56.101.

So if I wish to use ssh on Linux to connect to the Windows machine, I use the IP address 192.168.56.101, if I wish to use putty on Windows to connect to the Linux machine, I use the IP address 192.168.56.1. I have the VirtualBox DHCP Server configured as yours is. I don't know where you're getting the 127 address, or the 192.168.43 subnet.

I hope this is of some help with the basics. Beyond that, when in doubt, packet sniff. I would hope that wouldn't be tough with the Host-Only adapters, but if somehow the Internet Router is causing some/all of the confusion, that's the sort of possibility for which I keep an old and cheap, "dumb" hub around, not a "LAN switch"/etc., and I also keep extra NIC's, so I can "eavesdrop" on packet traffic between 2 or more separate physical devices.