[K12OSN] dhcpd.conf trouble

Julius Szelagiewicz julius at turtle.com
Fri Nov 4 20:29:03 UTC 2005

On Fri, 4 Nov 2005, Les Mikesell wrote:

> On Fri, 2005-11-04 at 12:53, Julius Szelagiewicz wrote:
> > P.S. If you know of a good tutorial on VLANs, please send me a link, I
> > must have been dozing off when that was covered :-)
> VLANs basically add a small header around the normal ethernet header
> to tag packets so they can be isolated.  Sometimes the router/switch
> equipment does all of the management, exposing only a single VLAN
> on each connection; sometimes you use a trunk connection to other
> vlan-aware equipment which then can appear to have multiple virtual
> interfaces fron the single physical connection.  I don't think it
> is documented very well but Linux is supposed to be able to handle
> vlan trunks and sub-interfaces.  But, the point of running the phones
> on a different VLAN would be to isolate the traffic physically so
> in this case you probably want the switch or router to do it instead
> of carrying them over to the server on the same trunk.
	yes it is my preference to run the phones on a separate physical
segment, but it is not an option. The switch is going in today/tomorrow
and I have to use existing cabling, so the PCs and terminals will attach
to ethernet ports on the phones. The VLAN "thing" according to the Mitel
docs would work somewhat like this:
1. the phone gets dhcp address on VLAN 1 (my current real segment)
2. the phone talks to Mitel switch on VLAN 1, gets from it an address on
VLAN 2 (192.168.31.x)
3. the phone releases address on VLAN 1
4. PC gets an address on VLAN 1

I am a bit lost here since I have "missed" the material on VLANs and I am
in NJ, the Mitel switch is in TX and I can't get there before Sunday. It
all needs to work by Monday morning - the old phone setup has cratered, so
I'm getting a new toy and the Company moves to IP phones.

I need to know what to do about VLANs on my HP Procurve switches - not too
hard according to the manuals and what to do about routing between VLANs.
It should be easy, since the whole ball of wax is run on a K12Ltsp server,
but I'm missing some crucial bits here.


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