DHCP and gateway 2

[taubate]

I have noticed that in setting up Microsoft DHCP, it doesn't ask for an IP for a gateway. Does it determine a gateway automatically by itself? If not, how does it know where to send data?

 

[tcvander]

It doesn't, the router should have a command called

ip helper-address x.x.x.x

Which will point to the IP address of the DHCP server or subnet. The DHCP server will send the PC it's default gateway info.

Also see here:

http://www.cisco.com/warp/public/779/smbiz/service/knowledge/tcpip/dhcp.htm

Todd VanDerwerken, CCNA, CCDA
Technical Consultant

http://www.ciscolinks.net

 

[ChrisAC]

I don't think that it's a Cisco router question, but more of a Microsoft DHCP issue.

When logging on to a Microsoft network with a MS DHCP server the client should get it's default gateway IP address as well as it's local IP address etc.. The question is how do you configure the default gateway on the DHCP server so that the client get the correct address?

Anyone?

Chris.
**********************
Chris Andrew, CCNA, CCSA
chris@iproute.co.uk
**********************

 

[tcvander]

Was the question from a DHCP SEVER prespective or a CLIENT prespective?
I've never set this up on a server before, but if there is no setting for the default gateway; my guess is that the server will use the IP address of the router forwarding the request to use as the default gateway.
Todd VanDerwerken, CCNA, CCDA
Technical Consultant

http://www.ciscolinks.net

 

[jimbopalmer]

if the DHCP server is not on the same subnet as the client (who uses a broadcast to find a DHCP server) my (nortel) routers have a service to send a unicast to the DHCP server when they get a broadcast, and present the results as their own I tried to remain child-like, all I acheived was childish.

 

[ChrisAC]

I think that taubate needs to provide more information. Are you talking about a DHCP server on the same subnet as the client, DHCP server config, client config or what?

Chris.
**********************
Chris Andrew, CCNA, CCSA
chris@iproute.co.uk
**********************

 

[tcvander]

I agree Todd VanDerwerken, CCNA, CCDA
Technical Consultant

http://www.ciscolinks.net

 

[taubate]

I am looking at it from a server perspective. In my situation, the client and DHCP server are on the same subnet.

 

[ChrisAC]

Ah, Microsoft DHCP server config! That's me done then! Anyone else have a clue?

Chris.
**********************
Chris Andrew, CCNA, CCSA
chris@iproute.co.uk
**********************

 

[Grenage]

If all your systems are on the local network and they server or client machines aren't accessing the net/lan elsewhere you shouldn't need to enter a Gateway IP should you ?

 

[ChrisAC]

They might need a gateway address if they're accessing the web without using a proxy or they need to FTP, Telnet, SSH etc to other hosts outside of their network. Eitherway, you can configure the DHCP server to give out the gateway address.

Someone must know MS DHCP.

Chris.
**********************
Chris Andrew, CCNA, CCSA
chris@iproute.co.uk
**********************

 

[ChrisAC]

Here you go! This tells you how to configure everything including the gateway address.

http://www.charlesriver.com/ONTHEWEB/Chapter4B.PDF

Chris.
**********************
Chris Andrew, CCNA, CCSA
chris@iproute.co.uk
**********************

 

[NickFerrar]

Not quire sure I understand the question but on the DHCP server itself you use a static IP address and therefore also manually set the IP address.

For the scope option you need in order to have the clients pick up their default gateway as well as their IP address you need to set the "Router" option on the scope.

 

[ChrisAC]

"Router" option .... that's the fella! It's in the PDF. **********************
Chris Andrew, CCNA, CCSA
chris@iproute.co.uk
**********************

 

[taubate]

Thanks much, everyone! It's good to know that a rookie like me has experts to consult with.