Ok so it kind of makes sense what your saying, but this is internal so I am
not worried too much about external access from anyone other than me.
So lets take Computer A, this is my primary DNS and technically my only DNS.
Although a VPS on Computer B is running a DNS it is there because of a Plesk
installation, and maintaining my internal domains.
Now the primary DNS does send or forward to Computer B - VPS, any requests
and also out my router/gateway.
Now the one thing I just did yesterday, was to remove the AD from and demote
Computer A as a Domain Controller. Since then I have actually been very
stable touch wood, that this may have been the issue.
On Mon, Sep 26, 2011 at 6:41 AM, Rance Hall <[email protected]> wrote:
> 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.
>
>
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--
Regards,
Andrew Scott
WebSite: http://www.andyscott.id.au/
Google+: http://plus.google.com/108193156965451149543
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