Change from dynamic to static ip address in my dsl router

Posted on 2004-09-21
Last Modified: 2013-12-14
I am trying to set up a Windows Server 2003, and having error problems, (

I thought it might help if I setup DHCP on my server, instead of the DHCP that is running on the dsl router of the network. So, I figured I should assign the static ip address from the ISP to the server, and then have the server give the other computers their ip addresses. When I go into the configuration of the dsl router and click the "static ip address" it brings me to a screen where I can input the ip address, dsn address, gateway address...  These are already filled out, I'm assuming that the router knows the values that I should use to configure my server based on the "real" values. but the ip address it has filled in is different than the ip address I get when I go out to the web and check my "public" ip address. Which one should I choose?, really I have tried both and iput the other values (gateway, dsn address,...) and all I get no internet connection after changing them.

Any suggestions.
thank you,
Bruce Mutch
Question by:bmutch
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LVL 40

Accepted Solution

Fatal_Exception earned 125 total points
ID: 12122288
This is not the way routers work.  Your router will get the external Public IP address from your ISP.  It should then configure itself as the Gateway, and all you need to do is to turn off DHCP on the router.  Whatever subnet your Gateway is in, should be the subnet in which you configure the LAN.  Give your server the static IP address within that subnet, turn on DHCP on your server, configure the DHCP scopes, make sure DNS is working properly, then your clients will get their IP addresses from the server.

For example:

Internet  >>  24.x.x.x  Router  <--> Server  <--> DHCP enabled clients receive addresses within the subnet of 192.168.1.x addresses

Make sure you set the Default Gateway in the DHCP server as, along with the DNS server as


Author Comment

ID: 12126748
thanks FE,
I now have the static ip address assigned, and can access the internet. When I go in to configure the DHCP server, it says it must be authorized in the Active Directory before it can assign ip addresses. So, I'm kinda back to where I was in having to setup my Active Directory and the problem I had with that. Can you help me with this question?


LVL 40

Expert Comment

ID: 12128045
Guess I should have viewed that question first, eh?  I just got a call from a panic'd client about their server and must make a run out of the office.  I will try to ck back when I get home...

And yes, you definitely need to setup AD first..  :)


Author Comment

ID: 12151797
thanks FE, I have accepted your answer, I now have the router working, and the problem with my other question was that a firewall internet filter was messing up the Server.

thank you.
Bruce Mutch
LVL 40

Expert Comment

ID: 12152451
Great..  and thank you..


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