DHCP with ISA

[netwalker1]

I have a DHCP Server configured on the Same ISA server Machine ..
The Machine has 2 Network Interfaces cards ,, one connected to the Internal LAN , and the other connected to the ISP ..
The one which connected to the ISP has a real IP , static on it ..
and the other has a Vertual IP ..

My problem :
When the DHCP started , it sent a DHCP packets to the ISP , which is denied by the ISP , so I found a conflict ..
I want to deny these packets to go to the interface which connected to the ISP ,, what shall I do ?

note that I need to keep the DHCP server on the same PC which has the ISA server ..


Mohamed Farid
Know Me No Pain , No Me Know Pain !!!

 

[seong76]

I have a simliar setup on my test domain, and I'm not experiencing any conflicts. Here's what I have setup on my ISA server. It's a DC (test.local) with NAT and DHCP configured. I use private range for my Internal segment and I don't see any conflicts when I check my event manager.
I know my post doesn't give you solutions, but hope you can resolve the issue.

 

[brendangriffin]

What address range are you using for your internal network?

 

[netwalker1]

The Network ID : 10.10.0.0/24
is this make any different ?!!!!! Mohamed Farid
Know Me No Pain , No Me Know Pain !!!

 

[SQLMail]

Hi.

Plz, excuse my bad english

I have too ISA Server and DHCP Server in the same machine. My external interface is DHCP client (get IP from ISP), and my internal interface is 10.0.0.1/8.

To your ISA Server get IP from ISP, enable in "Packet Filter" the "DHCP Client" rule.

After to make this, your ISA Server work very fine

PS: More details:

http://www.isaserver.org/pages/search.asp?query=ipautoconfiguration

[],s 4 All

SQLMail
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[lardum]

You need to bind the DHCP service to the internal NIC. You do this in DHCP Administrator. DHCP service usually bind itself to all static IP addresses. This means that the internal interface must also be a static ip address. If they both are they will be checkmarked under the bindings. Just remove the static IP address for you ISP and DHCP server won't answer any more DHCP requests on your external NIC.