Yep, that'll work just fine with a couple conditions. First you have to put
a ip helper-address command on the ethernet interface of the remote router
and the scope you setup for the remote office has to have a higher IP number
than the scope you're providing on the local network. Here's a sample that
will hopefully make sense:
DHCP server: 10.10.10.100 255.255.255.0
E0 address of remote router: 10.10.11.1 255.255.255.0
ip helper address on e0: ip helper-address 10.10.10.100
Two scopes on the DHCP server:
10.10.10.10-10.10.10.50 gateway=10.10.10.1
10.10.11.10-10.10.11.50 gateway=10.10.11.1
A client on the remote network sends a broadcast looking for a DHCP server.
The router sees the broadcast and forwards it to 10.10.10.100. The DHCP
server sees a broadcast coming from the router with along with info from the
router saying the packet came from the 10.10.11.0 network. The DHCP server
responds with a 10.10.11.0 address.
The reason the remote scopes have to be a higher IP number is because a
standard local broadcast doesn't really mention where it's being sent from
so the DHCP server blindly sends an address from the lowest numbered scope
as a default.
If you're using WINS you'll also want to add:
no ip forward-protocol udp netbios-ns
no ip forward-protocol udp netbios-dgm
to your router config....otherwise you'll get lots of master broweser
elections that'll fill up your event logs.
Hope this helps!
Daniel
-----Original Message-----
From: Vijay Ramcharan [mailto:[EMAIL PROTECTED]]
Sent: Friday, August 04, 2000 2:19 PM
To: 'Patrick Stiever'; Cisco Groupstudy. com Mailing list (E-mail)
Subject: RE: DHCP Over Wan Link
No you haven't been doing that thing with the fumes. On Windows NT Server's
DHCP Manager I know that you can use a NetBIOS scope ID to assign IP
addresses to different subnets/networks. I don't know much about other DHCP
management software. Maybe someone else can point you in the right
direction.
Vijay Ramcharan, CCNP, MCSE
-----Original Message-----
From: Patrick Stiever [mailto:[EMAIL PROTECTED]]
Sent: Friday, August 04, 2000 2:02 PM
To: '[EMAIL PROTECTED]'
Subject: DHCP Over Wan Link
Ladies and Gents,
This would be the first time trying to set this up, I have a remote
office with a frame-erlay link between them and the corporate site. The dhcp
server is at the corporate site, I would like to it up that the users at the
remote site uses a certain dhcp pool on that server. I have heard you can
set it up so that a certain address pool will only assign address when the
request comes through a certain router(i.e. the remote router). Does this
make any sense or have I been inhaling too many paint fumes again? Any help
would be great, thanks.
Patrick Stiever
Communications Engineer
24 Hour Fitness
(760) 918 4459
[EMAIL PROTECTED]
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