[nsp] dsl/dhcp question

[Siva Valliappan]

it's a broken config.  i will try to get it fixed.  hopefully someone
else can answer the other questions.  been a while since i dabbled in the
BBA world  :(

cheers
.siva


On Mon, 7 Jul 2003, Charles Sprickman wrote:

> Hi all,
>
> A few more  questions on DHCP + RBE to take care of things while I get the
> fancy option 82 business and ISC-DHCP playing nice together...
>
> Looking at the RBE docs (which seem to have gotten slimmer since the 6400
> was EOL'd), there are some examples like this:
>
> http://www.cisco.com/warp/customer/794/827rfc_6400rbe_2.html
>
> In this example, there is a 675 in bridge mode and a pc setup as a dhcp
> client.  The pvc terminates on a 6400, but there is no dhcp config on the
> 6400; just a static route set to the pvc.  What gives?  Is this just a
> mistake, or am I missing something?  From what I see, this wouldn't work.
>
> Next...  With RBE and the IOS dhcp server, if I enable dhcp, does the
> server (not relay-agent) automatically add a static route to the atm
> subinterface for the duration of the lease?
>
> Lastly, I've been trying to dig up as much info as I can on RBE and it
> seems like there's less on CCO than I remember.  Should I be looking
> anywhere beyond this:
>
> http://www.cisco.com/cgi-bin/Support/browse/psp_view.pl?p=Internetworking:RBE__Route-Bridged_Encapsulation&viewall=true
>
> I also was reading this, is there something like it that is updated?
>
> http://www.cisco.com/warp/customer/794/routed_bridged_encap.html
>
> Thanks,
>
> Charles
>
> On Mon, 30 Jun 2003, Siva Valliappan wrote:
>
> > Hi Charles,
> >
> >    this is definitely possible.  you will need to enable option 82
> > support on the router side.  what this does is that it fills in additional
> > fields in the DHCP Discover packet that is proxied to the DHCP server.
> > The server can then use the additional information to issue the same
> > address if desired.  however, you will need to make changes to the
> > DHCP server as well to make this happen.
> >
> > for the router overview:
> >
> > http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t2/ftrbeo82.htm
> >
> > this idea came from the cable world actually.  since the cable CMTSes were
> > the first to make use of option 82 support to control the addresses given
> > out to PCs behind cable modems.  so i believe any DHCP server that is
> > used to provision cable modems, will support this.  e.g. CNR.  if you are
> > using a Cisco DHCP server, a case with the TAC might help you get started.
> >
> > unfortunately i don't have a handy config sample for the DHCP server side.
> > hope this helps you get started.
> >
> > cheers
> > .siva
> >
> > On Sat, 28 Jun 2003, Charles Sprickman wrote:
> >
> > > Hello,
> > >
> > > I don't think the BBA list is big enough yet, so I thought I'd ask here.
> > >
> > > Some time ago when I first started looking at moving everyone from IRB to
> > > RBE, I could have sworn I found a doc on CCO that had some nifty tricks
> > > with RBE and DHCP.  Namely, that each user/subinterface could be tied to a
> > > particular IP address.  ie: if a dhcp request came in on "atm 2/0.1999",
> > > the dhcp server would always try to give out the same fixed IP.
> > >
> > > Did I imagine that?  I'm knee-deep in CCO and not seeing it.
> > >
> > > The goal is to auto-configure people who want static addresses without
> > > knowing their mac address in advance.
> > >
> > > Anyone doing something similar and willing to share?  It looks like this
> > > "option 82" thing can tell an external dhcp server something about where
> > > the request came from, but I'm not sure which dhcp server support this.
> > >
> > > Thanks,
> > >
> > > Charles
> > >
> > > --
> > > Charles Sprickman
> > > spork at inch.com
> > >
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> > >
> >
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