networking questions

[jaswheel]

Trying to setup 3 guests - using them for CEH training
Host: windows 10 - laptop
Guests: Ubuntu - Kali - Windows 10

I am wanting to setup each of the guests with two NICs, expected outcome is for them to have Internet and Intranet communication
- the first NIC to use NAT so they can get to the internet
- the second NIC to be a private network 192.168.2.0 subnet

I have all the guests configured with 2 Network Adapters
Inside Ubuntu I keep the first one configured with NAT
Once I enable the second, I configure it to use 192.168.2.3 IP 255.255.255.0 Subnet
Internet connection no longer works

Inside my Kali
I configure first NIC to use NAT
I change the second NIC to be static IP - and everytime I update the second NIC< the settings on the first NIC also change (and vice versa)

any way to get this working?

Thanks

[socratis]

Have you tried leaving the defaults? Neither the static IPs, nor the 192.168.2.0/24 are defaults for the adapters. Leave them at their defaults and start changing one parameter at a time so you will know what fails...

And when you say "private network" I assume you mean the VirtualBox "Internal network", right?

[jaswheel]

yes, private to the virtualbox guests only

I will try the dhcp, but I think I tried that already and the internal nic received no IP because of no dhcp server

[jaswheel]

still not working completely

the Ubuntu machine - settings seem fine, however it's difficult to tell if the internal network is working
I cannot seem to disable the IPV6 - and when I do an ifconfig it continues to display an IPV6 address and no IPV4 address

the Kali machine - once I enable the second NIC, even if I leave them both to DHCP - I no longer get Internet
I am also unable to disable the IPV6 internal, every change I made to NIC 2 also updates the settings on NIC1...not sure why this happens.

[socratis]

This is something that you have to troubleshoot within your guests. I think that it was in Kali, that if you enable one adapter it disables the others, a real pain. I almost troubleshot that one...

As far as Ubuntu, I have mine configured with 4 NICs and I have no problem at all. I want to see the output (for both your guests) of:

• ifconfig -a

If you have a problem with a guest in VirtualBox, it doesn't necessarily make it a VirtualBox problem. You might have better luck if you treat it as a native problem with the OS (of the guest).

[jaswheel]

I realize it may not be an issue with Virtualbox, the only reason I started here is because there seem to be a lot of people that know virtualbox and kali/Ubuntu. And, because it doesn't seem to work for both of my guest machines, leads me to believe I'm doing something wrong in Virtualbox.

Below is the output from my Ubuntu machine. I had to configure static IP for the IPV4, considering there is no DHCP server on my "internal" network, it would never pull an IP address. I cannot browse the internet when setup this way.

Code: Select all

jaswheel@jaswheel-ubuntu:~$ ifconfig -a
enp0s3    Link encap:Ethernet  HWaddr 08:00:27:6c:fe:37  
          inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
          inet6 addr: fe80::8101:eb17:eadf:2460/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3067 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1421 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2647804 (2.6 MB)  TX bytes:151006 (151.0 KB)

enp0s8    Link encap:Ethernet  HWaddr 08:00:27:e0:8a:d0  
          inet addr:192.168.2.3  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::defb:eb7c:e7c2:653d/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:146 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:14744 (14.7 KB)

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:817 errors:0 dropped:0 overruns:0 frame:0
          TX packets:817 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:77424 (77.4 KB)  TX bytes:77424 (77.4 KB)

Below is the output when I have both NICs set to DHCP. There is no IPV4 address, not even a non-routable IP. With this config, I can browse the internet from the guest.

Code: Select all

jaswheel@jaswheel-ubuntu:~$ ifconfig -a
enp0s3    Link encap:Ethernet  HWaddr 08:00:27:6c:fe:37  
          inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
          inet6 addr: fe80::8101:eb17:eadf:2460/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:7412 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3217 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:7284657 (7.2 MB)  TX bytes:475396 (475.3 KB)

enp0s8    Link encap:Ethernet  HWaddr 08:00:27:e0:8a:d0  
          inet6 addr: fe80::defb:eb7c:e7c2:653d/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:105 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:17938 (17.9 KB)

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:648 errors:0 dropped:0 overruns:0 frame:0
          TX packets:648 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:69669 (69.6 KB)  TX bytes:69669 (69.6 KB)