From: Dave Temkin (dave@ordinaryworld.com)
Date: Wed Nov 09 2005 - 11:47:52 GMT-3
Agreed. However, if you're not given the restriction against creating
additional IP's, I would go with the correct practice, which is having
matching networks and masks. Just because it doesn't perform the check
doesn't mean it's right.
-Dave
On Wed, 9 Nov 2005, Chris Lewis wrote:
> OSPF performs subnet number and mask checks on all media except point to point and virtual lilnks (RFC2328 section 10.5).
>
> If one was crazy enough to change the interface to a broadcast network type, the neighbor relationship would not be able to form.
>
> Chris
>
> "Schulz, Dave" <DSchulz@dpsciences.com> wrote:
> Interesting! Trying to think like the router on this one, can someone
> explain how this would possible be acceptable? Doesn't the tunnel look
> like a circuit to this scenario? Doesn't it have to be on the same
> subnet?
>
>
> Dave Schulz,
>
> Email: dschulz@dpsciences.com
>
>
>
> -----Original Message-----
> From: De Witt, Duane [mailto:duane.dewitt@siemens.com]
> Sent: Wednesday, November 09, 2005 9:04 AM
> To: Schulz, Dave; Dave Temkin; Dan Agache
> Cc: Cisco certification
> Subject: RE: OSPF Area 0 Tuneling
>
> Well, according to the IE solution you can. (150.1.3.3/24 and
> 150.1.4.4/24 on the endpoints of the tunnel) I haven't labbed it yet,
> I'll quickly change my tunnels to match their solution and see how it
> works.
>
> -----Original Message-----
> From: Schulz, Dave [mailto:DSchulz@dpsciences.com]
> Sent: 09 November 2005 03:57 PM
> To: Dave Temkin; Dan Agache
> Cc: De Witt, Duane; Cisco certification
> Subject: RE: OSPF Area 0 Tuneling
>
> This brings up a question....Since the tunnel is specifically being used
> to extend area 0, and the tunnel must have both ends in the same subnet.
> Doesn't this tunnel have to be an assigned ip address that is on the
> same subnet (both ends of the tunnel)? And, this subnet would then have
> to be assigned to area 0. Can this even be done with ip unnumbered?
>
>
> Dave Schulz,
>
> Email: dschulz@dpsciences.com
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Dave Temkin
> Sent: Wednesday, November 09, 2005 8:15 AM
> To: Dan Agache
> Cc: De Witt, Duane; Cisco certification
> Subject: Re: OSPF Area 0 Tuneling
>
> Be sure to read the wording of the lab carefully. They may (or may not)
> allow you to create additional IP addressing within a certain scope, as
> needed.
>
> Using ip unnumbered to a loopback isn't all that great of an idea, as
> your
> loopbacks will generally be in different subnets.
>
> -Dave
>
>
>
> On Wed, 9 Nov 2005, Dan Agache wrote:
>
> > I think that you have to use all that the lab is given, nothing more.
> Using another subnet address is extra commands and is not a good idea.
> That's my opinion.
> >
> >
> > "De Witt, Duane" wrote:
> > Hi Group
> >
> >
> >
> > Quick question: in the lab if you have to join discontiguous area 0's
> > with tunnels is it better to use ip unnumbered loopback 0 (assuming
> > loopback 0 is in area 0) or a new IP address and add the new subnet to
> > area 0 as well as the loopback.
> >
> >
> >
> > I'm asking this because in IEWB V2 Lab3, area 0 consists of the
> loopback
> > interface of each router. So a tunnel was used using ip unnumbered
> > loopback 0. My solution was to create a new subnet for the tunnel and
> > add it to area 0.
> >
> >
> >
> > Regards
> >
> > Duane
> >
> >
> >
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