Re: VLANs and DHCP

On Wed, Jan 24, 2007 at 07:36:51AM -0500, Yuri Lukin wrote:
On Tue, Jan 23, 2007 at 04:15:02PM -0000, jhall@xxxxxxxxxxxxxx wrote:
I currently administer a system which has two DHCP servers on two
different VLANs. Unfortunately, the two servers are not playing together
well and some comptuers are receiving IP addresses on the wrong network.
So, with our phone vendor's blessing, I am trying to move all of the DHCP
services to the FreeBSD server.

The computers on the network are supposed to receive an IP address on the
default vlan and the phones are supposed to receive an IP address on their
vlan.

Essentially what happens when a phone is booted, the phone receives an IP
address on the default VLAN, releases that address and then requests an IP
address on the appropriate VLAN.

Just a thought but if your switch properly tags the packets from the voice and
data Vlans, the broadcasts from the IP Phones should not cross over to the
data Vlan. We have dozens of customers setup this way and they are not having
any problems. Not sure what type of switches you are using but I would check
your switchport configuration (assuming managed switch).

Look at the behaviour of the ISC-dhcrelay. It's euhm... very
interesting if you have multiple ethernet cards in the server.

Edwin

--
Edwin Groothuis | Personal website: http://www.mavetju.org
edwin@xxxxxxxxxxx | Weblog: http://weblog.barnet.com.au/edwin/
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