Originally we had just one DHCP server on our network that was also serving
as a DNS server. The DHCP server only gives out IP's based on MAC
address reservations. It also assigns the router IP, DNS Server and DNS
domain name. Just
recently we added another DHCP server which is a domain controller for a
completely separate domain. It assigns completely different IP's, DNS servers
and DNS domain name. It also assigns IP's based on your MAC address. For some
strange reason, if I lease an IP from the first DHCP server - after about 24
hours or so, i'll notice that my connection specific DNS suffix changes to
the domain information (DNS suffix, DNS Server and DHCP server)of the second
DHCP server. Although my IP address stays the same. A simple IPCONFIG /RENEW
will restore my network settings from the first server. Any ideas on why my
DNS info just changes on it's own?

In news:F287CE0F-76D3-4F6D-87BC-FC57BBD150A9@microsoft.com,
Jeff <Jeff@discussions.microsoft.com> stated, which I commented on below:
> Originally we had just one DHCP server on our network that was also
> serving as a DNS server. The DHCP server only gives out IP's based on
> MAC
> address reservations. It also assigns the router IP, DNS Server and
> DNS domain name. Just
> recently we added another DHCP server which is a domain controller
> for a completely separate domain. It assigns completely different
> IP's, DNS servers and DNS domain name. It also assigns IP's based on
> your MAC address. For some strange reason, if I lease an IP from the
> first DHCP server - after about 24 hours or so, i'll notice that my
> connection specific DNS suffix changes to the domain information (DNS
> suffix, DNS Server and DHCP server)of the second DHCP server.
> Although my IP address stays the same. A simple IPCONFIG /RENEW will
> restore my network settings from the first server. Any ideas on why
> my DNS info just changes on it's own?

If you see the change in 24 hours, it kind of tells me the DHCP lease is two
days.

It's problematic at best having two DHCP servers unless configured in an
80/20 split. And without looking up technical info on it, it is strange that
if each DHCP server is ONLY strictly providing ip configurations by
reservations. It would appear that the other server, even though it doesn;t
have a lease reservation for the workstation, it is responding faster than
the one you want to use. Normally at 50% of the lease, the DHCP client will
attempt to renew it;s lease from the server it received the original auto
config from, but apparently if the original server is not responding fast
enough, it appears the other one is, but only providing the options and not
the IP itself.

Unless someone else can give you a better solution that I can't think of at
this time, it may be easier to either segment the two domains, use one DHCP
server and don't configure the suffix and provide the Primary DNS Suffix
thru a GPO, or both without the suffix and using a GPO.


--
Ace
Innovative IT Concepts, Inc (IITCI)
Willow Grove, PA

This posting is provided "AS-IS" with no warranties or guarantees and
confers no rights.

Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
Microsoft MVP - Directory Services
Microsoft Certified Trainer

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