From: massimo aronica (m_aronica@xxxxxxxxxxx)
Date: Tue Jan 16 2001 - 18:28:12 GMT-3
In fact Bob, it is happening also in my lab... with the exception (mistyped
I think) that
"The routing table on A will see the networks as 172.16.2.32/28 .64/28
.128/28 and .96/28 so there is some loss of address/network detail."
This is a trick to fool a router about the classful rule "drop if same major
but different subnet"... but I wonder what solution is this (Jeff ??). What
about those guys working behind router C with their IP adds 172.16.2.49 or
.50 or .81 etc ... we've lost them on the way.
Max
>From: "chahal" <bob.chahal@ntlworld.com>
>Reply-To: "chahal" <bob.chahal@ntlworld.com>
>To: "David FAHED" <dfahed@outremer.com>, <ccielab@groupstudy.com>
>Subject: Re: Jeff doyle errata??
>Date: Mon, 15 Jan 2001 22:49:34 -0000
>
>I seem to remember this one. What I found was that Router B accepts the
>routing info from Router C as /28 networks (i.e. 172.16.2.32/28 .64/28
>.128/28 and .96/28) and redistributes these into IGRP. The ethernet
>interface of Router C is still configured with an address from
>172.16.1.96/27. Router C will send rip updates of its connected networks
>but
>Router B will interpret tham as /28 networks.
>
>The routing table on A will see the networks as 172.16.2.32/27 .64/27
>.128/27 and .96/27 so there is some loss of address/network detail.
>
>----- Original Message -----
>From: David FAHED <dfahed@outremer.com>
>To: <ccielab@groupstudy.com>
>Sent: Monday, January 15, 2001 4:14 PM
>Subject: Jeff doyle errata??
>
>
> > I wonder if I missed something really important about redistribution
> > with classful protocol or if Jeff Doyle book have a big mistake:
> > Page 739 exercises:
> >
> > Router A is Running IGRP and Router C is Running RIPV1. Write a
> > configuration for router B that will provide full connectivity for all
> > subnets:
> >
> > 172.16.1.160/28 172.16.1.144/28
> > 172.16.1.224/28--RouterA---------e0-RouterB
> > 172.16.1.128/28 e1
> > 172.16.1.192/28 /
> > /
> > 172.16.1.96/27
> > /
> > /
> > RouterC
> > 172.16.2.32/27
> > 172.16.2.64/27
> > 172.16.2.128/27
> >
> > Page 958 solution of chapter 11 configuration :
> >
> > The solution is to use a 28 bit mask on RTB eth1 interface.
> > The config of RTB:
> > int e0
> > ip add 172.16.1.146 255.255.255.240
> >
> > int e1
> > ip add 172.16.1.98 255.255.255.240
> >
> > router rip
> > redis igrp 1 metric 1
> > pass int e0
> > net 172.16.0.0
> >
> > router igrp 1
> > redistribute rip met 10000 100 255 1 1500
> > pass inter e1
> > net 172.16.0.0
> >
> > My problem is with this config :
> > RTC will see all the route (of IGRP domain /28) BUT RTA will see only
> > one route 172.16.1.96/28 (of rip domain).
> >
> > Any help will be welcome!!!
> >
> >
> >
> >
> >
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