virtualbox.org

The static IP addresses are just 3:
192.168.1.1 (modem, passthrough mode)
192.168.1.2 (router, with DHCP)
192.168.1.3 (router with disabled DHCP, acts like access point).

The router (192.168.1.2) gives IP addresses above the 192.168.1.100 limit.

When I make the test, I disable the wifi of the androids. I use 3 pcs (3 hosts + 3 guests).

It is only the windows guests that complain. I wonder if there is a Windows program that can report which IP addresses are in conflict and the name of the device.

I assume that you have done all of the simple tests like just having the hosts running, starting one guest and leaving it for a while, starting a second guest and leaving it for a while to determine what is the minimum set of active machines that causes the problem.

You could always open up a Command Prompt on Windows and run

arp -a

and see if that tells you anything useful. Also, as the router (192.168.1.2) is giving out IP addresses, does it have a log to show which IP address is assigned to which MAC address?

-Andy.

1)

andyp73 wrote:Now that you have got all of the MAC addresses to be unique you need to look further across your network. Is there a DHCP server that might be giving out dynamic IP addresses and one conflicts with a device that has a static IP address?

The warnings from the operating system should tell you which IP address it is that is in conflict. Use that to find where it is.
-Andy.

I used ANGRY IP SCANNER and checked all active IPs in the network. Everything looks fine. I can see the IPs of the complaining windows hosts. They seem unique, I cannot detect any other devices using those specific IPs. I am now looking for more specialized tools that can detect duplicate IP addresses. EDIT: NetscanTools reported no duplicate IPs.

2) Can someone look at this "inverted MAC addresses" issue, I have described on this previous post, please?
viewtopic.php?f=2&t=92359#p444566

It is impossible to find duplicate IPs by scanning. One device will respond, the scanner moves to testing the next IP. Instead you'd want a tool that logs broadcast packets, but I don't know enough about network management to recommend one (I usually leave MAC addresses are they are and configure networks as little as possible).

In any case it's really very simple: if two devices have the same IP then they were assigned that IP by your actions. Either you gave both the same MAC address, or you gave one or both a conflicting static IP address. I doubt whether we can't fix network misconfiguration problems remotely, and it isn't really our problem anyway: there is no chance that VirtualBox caused this.

bobptz wrote:2) Can someone look at this "inverted MAC addresses" issue, I have described on this previous post, please?
viewtopic.php?f=2&t=92359#p444566

For this particular issue:
I went to windows network settings and I just renamed the connections (wifi to wired and visaversa). That was easy.

I THINK I solved the duplicate IP issue.

In each windows guest I went to the properties of each network connection and disabled the TCP/IPv6.

So far so good (after running 3 pcs for more than 15 min).