How are you doing DHCPv6 ?

Randy Carpenter rcarpen at network1.net
Mon Jan 23 13:44:55 CST 2012


We have also recently realized that the DUID is pretty much completely random, and there is no way to tie the MAC address to a client. This pretty much makes it impossible to manage a large customer base.

-Randy


----- Original Message -----
> This is a problem that would be nice for ISC to resolve (or another
> dependable FOSS implementation).
> 
> For a while now (about 20 years I believe) we've used ISC DHCPd in a
> distributed model for our public IPv4 space.  In a nutshell, each
> DHCP
> server is configured only with static assignments, their log files
> are
> monitored (simple event correlator), and scripts are fired off to
> perform tasks like new assignments against a centralized database
> (MySQL).  The database is responsible for keeping track of address
> assignments centrally and is used to generate configuration files for
> DHCPd.  Dynamic updates are made using OMAPI.
> 
> Unfortunately, the ISC DHCPv6 implementation makes replicating this
> impossible due to the lack of information logged.
> 
> Another problem with the ISC DHCPv6 implementation is that it doesn't
> allow you to assign fixed-address information based on the DUID _and_
> IAID, which becomes a problem when a host has more than one active
> adapter.
> 
> The only options are hacking the source code if you feel comfortable
> doing so, or waiting for ISC to make the change (if they ever plan
> to).
> 
> For now, we get by with static assignments made in the database and
> no
> dynamic allocation via DHCPv6, which does OK in a dual-stack
> environment where IPv6 isn't considered necessary yet, but in the
> near
> future that will change.
> 
> 
> 
> 
> On Tue, Jan 17, 2012 at 5:04 PM, Randy Carpenter
> <rcarpen at network1.net> wrote:
> >
> > I am wondering how people out there are using DHCPv6 to handle
> > assigning prefixes to end users.
> >
> > We have a requirement for it to be a redundant server that is
> > centrally located. DHCPv6 will be relayed from each customer
> > access segment.
> >
> > We have been looking at using ISC dhcpd, as that is what we use for
> > v4. However, it currently does not support any redundancy. It also
> > does not do very much useful logging for DHCPv6 requests.
> > Certainly not enough to keep track of users and devices.
> >
> > So, my questions are:
> >
> >
> > How are you doing DHCPv6 with Prefix Delegation?
> >
> > What software are you using?
> >
> >
> > When DHCPv6 with Prefix Delegation seems to be about the only way
> > to deploy IPv6 to end users in a generic device-agnostic fashion,
> > I am wondering why it is so difficult to find a working solution.
> >
> > thanks,
> > -Randy
> >
> > --
> > | Randy Carpenter
> > | Vice President - IT Services
> > | Red Hat Certified Engineer
> > | First Network Group, Inc.
> > | (800)578-6381, Opt. 1
> > ----
> >
> >
> 
> 
> 
> --
> Ray Soucy
> 
> Epic Communications Specialist
> 
> Phone: +1 (207) 561-3526
> 
> Networkmaine, a Unit of the University of Maine System
> http://www.networkmaine.net/
> 
> 



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