On Sun, Sep 25, 2011 at 3:57 AM, Andrew Scott <[email protected]> wrote: > Ok first a bit of a background > > > > Computer A: Running Windows 2008 SR2 64bit, and has a DNS server. > > > > Computer B: Windows 7 Ultimate 64bit, running Virtual Box with 2 instances. > Both Windows 2008 SR2 Servers, one running a DNS server. > > > > Computer A and Computer B are both in the same network, and Computer A is > also looking at the DNS server on Computer B instance for more names. The > DNS names are private names, and only resolve internally to the network with > Computer A then requesting out to the internet if can’t resolve locally. > > > > Now here is the problem, this is so random in both frequency and length of > time I have no idea where to begin even looking for a solution. Or even be > able to tell if this is a Virtual Box problem or not. But as Computer B is > the main workstation, I and has enough ram to run both the guest instances I > leave them running. But every so often Computer B can’t connect to the guest > by name, or can I ping them by their IP address from Computer B. > > > > But if I Remote Desktop to Computer A, I can not only browse the guests on > Computer B, I can ping them both by name and IP without any issues. When I > reset the network connection adapter for Computer B, this will 98% of the > time fix the problem. Until the next time it occurs. > > > > Now if I grab a laptop and say we call this laptop A, it will have the same > issues as Computer B. > > > > Now what is even stranger is that I have noticed on Computer B that there > are times when Firefox can browse the website on Guest A, but not Guest B, > and there are times when it won’t do either, and yet Chrome will have no > problems. But when Chrome does have an issue, then all have issues except > Computer A as it never seems to have any issues. > > > > So by this information this has been a headache to even begin to look in the > right place, but the common fact is that it is VirtualBox with the issue to > some degree. I used to have AVG installed but got rid of it thinking this > was the issue, but to no avail, as with Windows Security Essentials on > Computer B and that wasn’t the case either. > > > > Does anyone have any idea on what the problem might be, or even an idea on > where I can begin to look for a solution. >
I have an idea, I made a mistake setting up a new network and generated for myself some behavior that sounds very similar to what you describe. I made two mistakes, 1) I setup the internal only name resolution incorrectly 2) I setup the dns resolution order incorrectly I suspect that you have done the same, based on your description, I'm inclined toward #2 As part of the tcp address setup either through static or dynamic means, you need the IP address, a subnet mask, a gateway ip, and at least one dns ip address. It is the "At least one" dns part that usually causes the trouble. Lets say that I have only one DNS server in my home network. All of the other clients on my network should point their DNS1 entries toward my DNS servers ip address. Lets say that my ISP also has a DNS server and I add it to my clients IP records under DNS 2 This will cause the very behavior you describe. SOMETIMES, DNS2 will be used instead of DNS1 and you will either get different answers from both DNS servers or you will only be able to get correct answers from just one of them. The fix here is to make sure all your clients ONLY have one DNS IP address. YOURS. Even your DNS server box can be setup to use its own DNS server for name resolution instead of your ISP DNS. In fact I highly recommend you do it this way. After you get done setting this up correctly all the hosts on your network will be able to resolve all your controlled names correctly, all the time. Now you have to work on the DNS server itself to configure it for upstream name servers and such for places to go when it doesn't know what to do. Once you get that setup right, then DNS on your network will go just fine. One warning though" If your DNS server is ever offline, NONE of your clients can get on the net. Just exactly how you do that depends on your OSes and your versions of things. I'll leave you to ask other questions as your worth through all this. Its a lot to take in. Let us know if this is the issue or if there is something else going on. ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 _______________________________________________ VBox-users-community mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/vbox-users-community
