We have a configuration at our company that has the same configuration as
you just described.
But somewhere along the line .. This doesn't seem to work that well.
We got about 4 vlans, all vlan interfaces have an ip helper address to our
DHCP server. Problem is that 8 out of 10 times, a DHCP client doesn't get an
ip address. We used an Windows NT server as DHCP but also Nortel's NetID.
Both systems give the same problems.
Some times a user moves from one vlan to the other but gets an ip address
from the old vlan he was in before he did a DHCP request for his new VLAN.
We have been trying to find the solution but didn't succeed sofar, maybe
somebody had this before and is willing to share it with me.
We use a Cisco cat 6500 to handle to forwarding to the DHCP server and the
VLAN routing, as access switches we have Cisco cat 3500.
Thnx in advance,
JT
-----Original Message-----
From: Pawel Sikora [mailto:[EMAIL PROTECTED]]
Sent: donderdag 31 mei 2001 10:49
To: [EMAIL PROTECTED]
Subject: Re: Weird DHCP/VLAN solution suggestions wanted!! [7:6579]
----- Original Message -----
From: "Sam Deckert"
> The problem is the client wants to use DHCP, so that people in the
> offices can simply plug in and away they go. But how would you go
> about implementing a DHCP server in this situation?? In order to
> allocate an address from the appropriate range, the DHCP server needs
> to be aware of
the
> VLAN that the client DHCP request came from. I have not been able to
> find
a
> DHCP server that has this capability whatsoever. I am sure this has
> been done before - does anyone know how or have any suggestions??
At the edge of each VLAN, an instance
of router subinterface is obviously needed.
You can configure at each subinterface
ip helper address pointing to a real dhcp
server located anywhere.
Router then forwards any dhcp requests
broadcasted by stations in vlans with
apopriate subnet info, that dhcp server can
use a defined scope for each vlan.
Server than answers with lease data to the
requestor via directed broadcast.
(im not sure if such way)
For example NT dhcp server service
works flawlessy with such topology,
with many different scopes.
Pawel/
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