[Last Call] Learn how to a build a cloud-first strategyRegister Now

x
?
Solved

DHCP Setup Help !!! not responding to DHCP requests!

Posted on 2007-10-08
4
Medium Priority
?
373 Views
Last Modified: 2010-04-18
My connection is setup like this

T1 -> Cisco 1721 router -> switch -> server, workstations, net printers..etc.


AD is installed, and dcpromo'd. DNS configured correctly.

now i want to run DHCP on this server, the DHCP on the cisco router is turned off. (we were using the DSL router as DHCP before)

We are assigned static IPs from our ISP, like below

usable IP range: 216.32.155.1 - 216.32.155.6
Broadcast address: 216.32.155.7
router IP 216.32.155.1
subnet mask: 255.255.255.248
DNS 1: 216.116.96.2
DNS 2: 216.116.96.3

1st NIC is setup as static IP like above, I assigned 216.32.155.2 to the server, 2nd NIC is disabled for now.

so I setup the DNS on the server, and in the NIC properties, DNS is setup to the server IP, and in DNS forwarder i set it to forward all queries to our ISP DNS 216.116.96.2 /3

the server has access to internet and everything.

DHCP is setup like this
Start IP: 192.168.0.14
End Ip : 192.168.0.47
Subnet: 255.255.255.0
Scope Option>Router> 216.32.155.1 (T1 router)
Scope Option>DNS Server> 216.116.96.2 /3

while on the workstations, they are not getting any DHCP response at all.

Did i assign wrong IPs in that DHCP table?

I do not want to assign real IPs to workstations, I want to assign private block of IPs to the internal machines, like how it was before with the DSL router.

Can anyone point me to the right direction? Please help!!
0
Comment
Question by:mike2016
  • 3
4 Comments
 
LVL 5

Expert Comment

by:bkellyboulderit
ID: 20038383
You would either need to enable that second NIC and assign it an internal address to do this, or as I would do, I would have a firewall with NAT turned on and your server would only use one NIC with an internal adress assigned.

However, since you have already DC'd it, changing the IP could be bad. You should probably enable the 2nd NIC. Is this SBS premium with ISA?
You would have the 2nd NIC in the same switch as the PC's. The primary NIC would go into the router. The switch the PC's are on, would not be plugged into the router.
0
 

Author Comment

by:mike2016
ID: 20038419
that was quick!  this is a Win2003 R2 Standard Edition, running on DELL 2950 server

so to make the DHCP work for the internal workstations,
I enable the 2nd NIC, and I assign it an internal address such as 192.168.0.1 ?  and it will start leasing out private IPs ?    what gateway IP will the NIC use?

but if I connect the Router to 1st NIC,  then 2nd NIC to our internal network,  how will the 1st and 2nd NIC communicate?   in that case they are on two seperate networks.  1 is public network, other is internal.  our internal workstations need to have access to internet as well using the same T1 line.


0
 
LVL 5

Accepted Solution

by:
bkellyboulderit earned 2000 total points
ID: 20038470
It's late, but... you can use the server as a router to route the packets from internal to external. I believe you will leave the gateway empty and use network bridging.

http://articles.techrepublic.com.com/5100-6345_11-5569815.html
http://technet2.microsoft.com/windowsserver/en/library/8c6c4acb-49db-4d8a-844f-1fe31c4b2ded1033.mspx?mfr=true

You would set up DNS on the internal NIC to point to the internal IP of the server (itself).

Example:
IP 192.168.1.10
SN 255.255.255.0
GW
DNS 192.168.1.10
WINS 192.168.1.10

You would tell DHCP to hand out the addresses using DNS of 192.168.1.10 not the public ips....

requests would come to the server and then route out, and vice versa.

Read the stuff carefully before experimenting on your network.
Don't use ICF or ICS on your domain controller, per the article.

I would make sure your server is behind a firewall. I don't trust Windows in the open....
0
 
LVL 5

Expert Comment

by:bkellyboulderit
ID: 20038474
PS> WINS would also be 192.168.1.10 in DHCP
0

Featured Post

Upgrade your Question Security!

Add Premium security features to your question to ensure its privacy or anonymity. Learn more about your ability to control Question Security today.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I've always wanted to allow a user to have a printer no matter where they login. The steps below will show you how to achieve just that. In this Article I'll show how to deploy printers automatically with group policy and then using security fil…
A quick step-by-step overview of installing and configuring Carbonite Server Backup.
Are you ready to place your question in front of subject-matter experts for more timely responses? With the release of Priority Question, Premium Members, Team Accounts and Qualified Experts can now identify the emergent level of their issue, signal…
When cloud platforms entered the scene, users and companies jumped on board to take advantage of the many benefits, like the ability to work and connect with company information from various locations. What many didn't foresee was the increased risk…

830 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question