From: Amit Jain (netsteps@rediffmail.com)
Date: Mon Jul 11 2005 - 12:22:36 GMT-3
Great Brian's...now the ball is in your court :-)
Amit Jain
----- Original Message -----
From: "John Matus" <jmatus@pacbell.net>
To: "Amit Jain" <netsteps@rediffmail.com>; "Arun Kumar Arumuganainar"
<aarumuga@hotmail.com>; <silamoni@yahoo.com>
Cc: <ccielab@groupstudy.com>
Sent: Monday, July 11, 2005 12:11 PM
Subject: Re: IE Lab15 Task 5.21
> although i've not read up on the implementation of p2p non broadcast, i
> think the jist of the solution is that a 'p2p' non-broadcast is inherently
> more secure than a non p2p non-broadcast circuit.....but again, i've not
> read up on the technology. there is probably somthing happening at layer
2
> that makes it more secure. i'm sure answer is in the wording of the
> question, because it does seem that setting up a non-broadcast medium w/
> neighbor statement, as well as preventing hello's w/ a passive inteface
> command, would fulfill the task requirements.....but only Brian know's the
> answer ;-P
>
>
> Regards,
>
> John D. Matus
> MCSE, CCNP
> Office: 818-782-2061
> Cell: 818-430-8372
> jmatus@pacbell.net
> ----- Original Message -----
> From: "Amit Jain" <netsteps@rediffmail.com>
> To: "Arun Kumar Arumuganainar" <aarumuga@hotmail.com>;
<silamoni@yahoo.com>
> Cc: <ccielab@groupstudy.com>
> Sent: Sunday, July 10, 2005 11:29 PM
> Subject: Re: IE Lab15 Task 5.21
>
>
> > Thanks Arun, but still I cannot relate your answer to my questions. In
my
> > Diagram
> >
> > R3 ----frame-relay----R5 ------isdn-------R4
> >
> > Do you call this hub and spoke, if they are connected together through
> > different WAN topology??
> > R3 and R5 are on non-broadcast default mode for which neighbor statement
> > is
> > configured.
> > R5 and R4 are on point-to-point mode as what i seee from "sh ip ospf
inter
> > bri0/0"
> >
> > Ques asked to prevent hello packets to anyone hooking on to this
topology.
> > Sol says that configure point-to-multipoint non-broadcast on all the
> > routers.
> > My Ques : Why to configure point-to-multipoint non-broadcast when the
> > default network type between R3 and R5 is non-br and sending unicast (so
> > nobody can hook on this segment and see hello) AND
> > Why to configure point-to-multipoint non-broadcast between R5 and R4
when
> > default network type point-to-point will prevent leaking of hellos, as
the
> > hellos will only go to other side.
> >
> > What am I missing?
> >
> > AMit
> >
> > ----- Original Message -----
> > From: "Arun Kumar Arumuganainar" <aarumuga@hotmail.com>
> > To: <silamoni@yahoo.com>
> > Cc: <ccielab@groupstudy.com>
> > Sent: Sunday, July 10, 2005 5:14 PM
> > Subject: Re: IE Lab15 Task 5.21
> >
> >
> >> For Fram Relay Networks , Default Mode in Frame Relay Network is NBMA .
> >> But this will work only with Fully Meshed network .In Hub and Spoke
> >> topology full connectivity can not be achived . Spoke routers will only
> >> be able to ping Hub router and none of the other spoke routers.
> >>
> >> Note :In the above scenario OSPF neighborship will get established .
> >> Routing table will get populated as normal . But however , connectivity
> >> alone will not be there across the Spokes .This Problem will also be
seen
> >> in Partially meshed networks as well .
> >>
> >> By making the Network type Point to Multipoint you can over come this
> >> problem . Actually if you inspect the routing table on the point to
> >> Multipoint network , you will be able to observe host route ( Route
with
> >> /32 Bit mask ) for all connected IP address . This will enable routing
> >> possible between spokes !!!
> >>
> >> Pls. Note : You could add broadcast keyword appended to point to
> >> Multipoint . In case you are not allowed to configure broadcast key
word
> >> then you will have manually configure neighbour statement . This will
> >> enable OSPF packets to unicasted over the FR Cloud .
> >>
> >> Hope this helps.
> >>
> >> Thanks and Regards
> >> Arun
> >>
> >> >From: Sila Moni <silamoni@yahoo.com>
> >> >Reply-To: Sila Moni <silamoni@yahoo.com>
> >> >To: Amit Jain <netsteps@rediffmail.com>, Group Study <>
> >> >Subject: Re: IE Lab15 Task 5.21
> >> >Date: Sat, 9 Jul 2005 05:52:29 -0700 (PDT)
> >> >
> >> >There are two issues that I see from this scenario.
> >> >
> >> >1. Typically, you would use the neighbor statement on
> >> >the hub. Since it is on R3 (spoke), it will create
> >> >some problems. Are you allowed to put the neighbor
> >> >statement on R4 as well?
> >> >
> >> >2. P-T-M non-broadcast is used in NBMA with virtual
> >> >circuits of differing speeds (e.g. ISDN and FR).
> >> >Here, assigning cost to the neighbor is optional.
> >> >
> >> >
> >> >--- Amit Jain <netsteps@rediffmail.com> wrote:
> >> >
> >> > > Hi
> >> > >
> >> > > In the task, R3 and R5 are connected through frame
> >> > > relay and R4 and R5 through
> >> > > ISDN
> >> > >
> >> > > R3
> >> > > -
> >> > > -
> >> > > - FR -
> >> > > -
> >> > >
> >> > > R4 - -ISDN - - R5
> >> > >
> >> > > Now the ospf area 345 is running on FR and ISDN
> >> > > links and network type
> >> > > non-broadcast between R3 and R5, with neighbor
> >> > > command on R3.
> >> > > Task requirement is to configure all adjacencies in
> >> > > area 345 in such a manner
> >> > > that other devices on segment cannot recieve OSPF
> >> > > hello packets.
> >> > > The solution given is that the network type on ISDN
> >> > > and FR segment be changed
> >> > > to point-to-multipoint (with ofcourse neighbor
> >> > > statements)
> >> > >
> >> > > My ques is why we need to change it to
> >> > > point-to-multpoint from non-broadcast
> >> > > on FR segment ? When the netwrk type is
> >> > > non-broadcast we are sending packets
> >> > > as unicast only, so why specifically change to
> >> > > p-to-multipoint ?? (Only
> >> > > difference will be no DR/BDR elec and host route)
> >> > >
> >> > > Also the ISDN segment is network type point-to-point
> >> > > so anyways the hello
> >> > > packets will only go to the other side ?? What am i
> >> > > missing.
> >> > >
> >> > > Could not get the answer from IE website posts.
> >> > >
> >> > > Thanks
> >> > > Amit Jain
> >> > >
> >> > >
> >>
>_______________________________________________________________________
> >> > > Subscription information may be found at:
> >> > > http://www.groupstudy.com/list/CCIELab.html
> >> > >
> >> >
> >> >
> >> >
> >> >
> >> >____________________________________________________
> >> >Sell on Yahoo! Auctions no fees. Bid on great items.
> >> >http://auctions.yahoo.com/
> >> >
> >>
>_______________________________________________________________________
> >> >Subscription information may be found at:
> >> >http://www.groupstudy.com/list/CCIELab.html
> >>
>
>> ------------------------------------------------------------------------
> >>
> >> Looking for a date? Meet interesting singles like you Sign up with
> >> Match.com
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sun Sep 04 2005 - 17:00:29 GMT-3