DHCP and Dyndns Problems

Hello NG, I am pretty new in this scene, but I think I have some
interesting problems. One of them is this:
In the company we have anSBS2008 installed, a Router for Internet-Access,
it works all fine.

I have the same configuration at home with a second Licence, this one
works fine too.
Both Servers are named: SBS-1.

Then I configured Dyndns on the Router. We can reach our system (and the
network) using MyDom1.dyndns.org.
The same was done at home with MyDom2.DynDNS.org.

So far so good, I wanted to check the DHCP-Server and now itŽs getting
weird:
On my server at home, I have in the DHCP an entry: SBS-1.MyDom2.local, as
it should be. I can configure the Network and the leases.
In the Company this entry is called: MyDom1.dyndns.org and it is marked
red. The server Never was told, there is a Dyndns entry somewhere. This
was managed by the router! (In this case a Fritz!box, at Home I use a
Draytek)
I can delete the entry and connect to an authorized server,
sbs-1.MyDom2.local. This one is then listed, but in the moment I select
it, I get it red marked again...
If I try searching, I enter the name, SBS-1, check the name, it is named
correct. If I confirm, I get an entry in the DHCP-Console named
MyDom1.dyndns.org!!! If I selct it, it is marked red again.

The system works, but I cannot change anything in the configuration.
ThatŽs worrying me.

Anyvbody who has an Idea? Can I deinstall and reinstall the DHCP wiith no
problems/ danger?
Any other Solution?

Thanks in advance,
Jacob

"Jacob van Iwaarden" wrote in message
news:4e5a3975$0$30113$

Hello NG, I am pretty new in this scene, but I think I have some
interesting problems. One of them is this:
In the company we have anSBS2008 installed, a Router for Internet-Access,
it works all fine.

I have the same configuration at home with a second Licence, this one
works fine too.
Both Servers are named: SBS-1.

Then I configured Dyndns on the Router. We can reach our system (and the
network) using MyDom1.dyndns.org.
The same was done at home with MyDom2.DynDNS.org.

So far so good, I wanted to check the DHCP-Server and now it´s getting
weird:
On my server at home, I have in the DHCP an entry: SBS-1.MyDom2.local, as
it should be. I can configure the Network and the leases.
In the Company this entry is called: MyDom1.dyndns.org and it is marked
red. The server Never was told, there is a Dyndns entry somewhere. This
was managed by the router! (In this case a Fritz!box, at Home I use a
Draytek)
I can delete the entry and connect to an authorized server,
sbs-1.MyDom2.local. This one is then listed, but in the moment I select
it, I get it red marked again...
If I try searching, I enter the name, SBS-1, check the name, it is named
correct. If I confirm, I get an entry in the DHCP-Console named
MyDom1.dyndns.org!!! If I selct it, it is marked red again.

The system works, but I cannot change anything in the configuration.
That´s worrying me.

Anyvbody who has an Idea? Can I deinstall and reinstall the DHCP wiith no
problems/ danger?
Any other Solution?

Thanks in advance,
Jacob

DynDns and DHCP should be completly unrelated.

My suspision is that either:

1. Your router is acting as a DHCP server. The only reason I can think of
for why the DHCP server won't start is if it detects another one.

2. You are VPN'ing to this server to configure it. (I can't think why else
DynDns is a factor.) Ordinarily this should be fine, but if you are
VPN'ing from a network with an SBS server I wonder whether that might be
causing you a problem.

Could you check also that the IP address of your server is static - it
isn't trying to assign an IP address using a DHCP server - this also might
account for where the DynDns name is coming from but I'm just speculating.
At the same time check that your DNS server is your SBS box and not the
router.

Brian Cryer
http://www.cryer.co.uk/brian

Hello Bryan,
thanks for your answer. I checked and answered your questions below. I
know,
I had a mistake in the beginning, I deaktivated the Router-DHCP while
installing the SBS, but somehow it was aktivated for a few minutes later.
The DHCP from my SBS is working, no doubt, but: I can not configure it
;-((

Jacob.

From: "Brian Cryer"
Newsgroups: microsoft.public.windows.server.sbs
Sent: Tuesday, August 30, 2011 6:22 PM
Subject: Re: DHCP and Dyndns Problems

"Jacob van Iwaarden" wrote in message
news:4e5a3975$0$30113$

Hello NG, I am pretty new in this scene, but I think I have some
interesting problems. One of them is this:
In the company we have anSBS2008 installed, a Router for
Internet-Access, it works all fine.

I have the same configuration at home with a second Licence, this one
works fine too.
Both Servers are named: SBS-1.

Then I configured Dyndns on the Router. We can reach our system (and the
network) using MyDom1.dyndns.org.
The same was done at home with MyDom2.DynDNS.org.

So far so good, I wanted to check the DHCP-Server and now itŽs getting
weird:
On my server at home, I have in the DHCP an entry: SBS-1.MyDom2.local,
as it should be. I can configure the Network and the leases.
In the Company this entry is called: MyDom1.dyndns.org and it is marked
red. The server Never was told, there is a Dyndns entry somewhere. This
was managed by the router! (In this case a Fritz!box, at Home I use a
Draytek)
I can delete the entry and connect to an authorized server,
sbs-1.MyDom2.local. This one is then listed, but in the moment I select
it, I get it red marked again...
If I try searching, I enter the name, SBS-1, check the name, it is named
correct. If I confirm, I get an entry in the DHCP-Console named
MyDom1.dyndns.org!!! If I selct it, it is marked red again.

The system works, but I cannot change anything in the configuration.
ThatŽs worrying me.

Anyvbody who has an Idea? Can I deinstall and reinstall the DHCP wiith
no problems/ danger?
Any other Solution?

Thanks in advance,
Jacob

DynDns and DHCP should be completly unrelated.

My suspision is that either:

1. Your router is acting as a DHCP server. The only reason I can think of
for why the DHCP server won't start is if it detects another one.

My router was activateed as a DHCP-Server for a short while ;-(
I found out very fast, that there was a problem in the network and
deaktivated the Router-DHCP.

2. You are VPN'ing to this server to configure it. (I can't think why
else DynDns is a factor.) Ordinarily this should be fine, but if you are
VPN'ing from a network with an SBS server I wonder whether that might be
causing you a problem.

Yea, I connect the server via VPN, but:
The adress for external is a dyndns-Address, which reaches the router.
This
will pass the packets (based on the Ports used) through to the server,
using
an internal IP-Adress. So the server will get a VPN-Tunnel to extern but
the
IP-Adress he sees, is in his own network. (I checked)

Could you check also that the IP address of your server is static - it
isn't trying to assign an IP address using a DHCP server - this also
might account for where the DynDns name is coming from but I'm just
speculating. At the same time check that your DNS server is your SBS box
and not the router.

Yes the server has got a static IP-Adress. And it was not changed at all.

Brian Cryer
http://www.cryer.co.uk/brian