IP Conflict

[bunty18]

We are using windows 2000 domain controller and use static IP in the company. We have one more windows 2000 server on which ISA 2000 is installed and that server worked as internel server.

For internal network we use static IP ranges from 10.0.0.0 to 10.0.0.255. Our ISP has given us 5 external addresses starting from 64.0.0.0 .

The internet server has two network cards, one for external connection and one for internal network.

My question is that the client computers use static 10.0.0.0 ips but if I change the netwok setting to automatically assign IPS it should not get the IP from the server and it should not connect to the internel but it actually gets one of those external IPs with subnet and gateway that I have gotten from my ISP.

Thinking that maybe these extra external IPs are not being used so the server is giving these IPs to those computers that are on getting IPs automatically. SO I added all 5 external IPs on the external network card on the internet server so it wont give these ip anymore to the client computers if somebody change the network settings on the computer.

But now it still give one of these 5 external IPs to the client computer if somebody change the network setttings on their computers. Then the external IPs get conflict and internet stops working.

There is no DHCP setup, we use static IPs on the client computers.
Can somebody explain why server is giving these external IPS that are already being added to the external network card on the server.

Do I need to make any change in the settings on my domain controller or the ISA 2000 so my internet server so it stops giving those IPs to the client.

Thanks in advance

 

[NortonES2]

Just because you allocate an IP address to a NIC the DHCP server won't stop giving that IP out, you need to remove it from the scope on the DHCP server. If you don't want to use DHCP then you may as well stop the DHCP server.

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If it doesn't leak oil it must be empty!!

 

[bunty18]

As I have given static addresses to the servers and computers. I saw a service ruuning on the internet server "DHCP Client". Do you think this problem can be solved by stopping this service.

 

[eaglefan2000]

Sounds like you need to block DHCP requests from passing through your router or gateway. This way the request stops at the router instead of passing. through to the outside. If this does not fix, you have an internal dhcp server with that scope somewhere in your local network.

Joseph Kunder
Technical Systems Specialist

 

[bunty18]

The gateway router has DHCP enabled. I called my ISP and had that DHCP disabled and now the problem has been solved.


Thank You so much guys for your help.