VLANs and DHCP

[Edwin Groothuis]

On Wed, Jan 24, 2007 at 07:36:51AM -0500, Yuri Lukin wrote:
> On Tue, Jan 23, 2007 at 04:15:02PM -0000, jhall at vandaliamo.net 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 at mavetju.org    |          Weblog: http://weblog.barnet.com.au/edwin/