Guys,
there is something very WRONG here .... i have a 6509 on site a single DHCP
server ......various VLans and never miss an renew........
are you using the ip helper address properly...( i Mean NO offence)...what i
mean is setting a range ....
ip helper address 10.0.*.* to 193.194.199.9
if so check the lease`s on the DHCP server.......
i need some more info to help i recon your DHCP server is up the
swany....are there enough addresses in the scope for all users...
(someone i know set up a scope with 1 ip address in to and wondered why only
one client got a renew????)
you only need the ip dhcp command if you want to 65 to BECOME the Dhcp
server...(don`t do it ....it`s a nightmare to adiminster)...
please post MSFC configs for inspection
HTH
steve
>From: "Chuck Larrieu"
>Reply-To: "Chuck Larrieu"
>To: [EMAIL PROTECTED]
>Subject: RE: Weird DHCP/VLAN solution suggestions wanted!! [7:6579]
>Date: Thu, 31 May 2001 10:06:06 -0400
>
>A comment or two within:
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
>Jeroen Timmer
>Sent: Thursday, May 31, 2001 2:03 AM
>To: [EMAIL PROTECTED]
>Subject: RE: Weird DHCP/VLAN solution suggestions wanted!! [7:6579]
>
>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.
>
>CL: unfortunately, windoze does not release ip addresses upon shutdown.
>Windows machines tend to retain the ip address acquired as long as the
>lease
>time has not expired. And sometimes even longer. I've run into problems
>with
>mobile users, who upon returning to the office find themselves using and ip
>address that has been reassigned. This is a windows problem, a "feature" if
>you will.
>
>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.
>
>CL: I ask because I do not know: does the "router" function of the 65xx
>actually behave the way it is supposed to?
>
>
>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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