Re: Router blew a gasket

From: Stephen Skinner (stephen_ski@hotmail.com)
Date: Mon Jan 05 2004 - 14:00:16 GMT-3


Chaps...

i think i have figured ( i,e been told about my mistake)...i keep thinking
hosts and not network`s...

oh Dear...Oh dear OhDear OhDear ...very silly boy.....

not embarssing at all for a CCIe lab candidate...

WOOPS

many thanks

>From: oletu@inbox.lv
>To: stephen_ski@hotmail.com, ccielab@groupstudy.com
>Subject: Re: Router blew a gasket
>Date: Mon, 5 Jan 2004 10:46:16 -0500
>
>172.16.111.x is on network 172.16.104.x based on 255.255.248.0 netmask.
>
>256-248 = 8, so it increament of 8s and not 6 as you said ealier.
>
>thanks
>Godswill
>
>----- Original Message -----
>From: "Stephen Skinner" <stephen_ski@hotmail.com>
>To: <ccielab@groupstudy.com>
>Sent: Monday, January 05, 2004 6:12 AM
>Subject: Re: Router blew a gasket
>
>
> > If i may ....
> >
> >
> > i don`t get it ...
> >
> > how can
> >
> > ip address 172.16.111.1 255.255.248.0
> >
> > have 172.16.104.x in it`s network ....248 mask will mean that every 6
>there
> > is a change of network ..
> > i.e 6 12 18 ...meaning that with a /21 the first network is .108....
> >
> > or am i going stark raving bonkers !!!!
> >
> >
> > >From: "John Underhill" <stepnwlf@magma.ca>
> > >Reply-To: "John Underhill" <stepnwlf@magma.ca>
> > >To: "Dmitry Volkov" <dmitry.volkov@rogers.com>, "'CXP Peter'"
> > ><peter@cyscoexpert.com>, <groupstudy@cconlinelabs.com>
> > >CC: <ccielab@groupstudy.com>
> > >Subject: Re: Router blew a gasket
> > >Date: Sun, 4 Jan 2004 15:14:36 -0500
> > >
> > >Got it.. think it's just 'study fatigue' on my part, or Seeing
>Anomalous
> > >Route Syndrome..
> > >Thanks
> > > ----- Original Message -----
> > > From: Dmitry Volkov
> > > To: 'CXP Peter'
> > > Cc: ccielab@groupstudy.com
> > > Sent: Sunday, January 04, 2004 2:12 PM
> > > Subject: RE: Router blew a gasket
> > >
> > >
> > > Some comment inline:
> > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On
> > > > Behalf Of CXP Peter
> > > > Sent: Sunday, January 04, 2004 1:59 PM
> > > > To: ccielab@groupstudy.com
> > > > Subject: Re: Router blew a gasket
> > > >
> > > >
> > > > IP address 172.16.111.1 255.255.248.0 happens to be on the
> > > > 172.16.104.0/21
> > > > subnet and you advertised some addresses from this subnet
> > >
> > > Network statement under OSPF doesn't advertise addresses it rather
> > >specifies
> > > what interface OSPF is running on
> > > and OSPF will advertise actual network configured on this interface,
> > >which
> > > is /21 in this case.
> > >
> > > > with "network
> > > > 172.16.111.0 0.0.0.7 area 11". So it is very normal to see
> > > > this route being
> > > > advertised in OSPF.
> > > >
> > > > _____________________________
> > > > Peter
> > > > #7247 (R&S, Security, SP)
> > > > CyscoExpert Corp.
> > > > 4433 W. Touhy Ave. Suite 410
> > > > Lincolnwood, IL 60712
> > > > Phone (847) 674-3392
> > > > Toll Free (866) CyscoXP (297-2697)
> > > > Fax (847) 674-2625
> > > >
> > > > ----- Original Message -----
> > > > From: "John Underhill" <stepnwlf@magma.ca>
> > > > To: <ccielab@groupstudy.com>
> > > > Sent: Sunday, January 04, 2004 12:36 PM
> > > > Subject: Router blew a gasket
> > > >
> > > >
> > > > > I was looking through the routing tables and noticed a
> > > > route I didn't
> > > > > advertise. This is really strange, because it says loop0 is
> > > > connected on
> > > > this
> > > > > box in the route table, and is advertising it into OSPF,
> > > > but the loop0
> > > > address
> > > > > that is configured is not the same, (not even close), and I
>never
> > > > advertised
> > > > > this network in OSPF. Router has been rebooted and erased
> > > > since the last
> > > > > config, but it looks like it's keeping it in memory.. pretty
>weird..
> > > > >
> > > > > 172.16.0.0/16 is variably subnetted, 9 subnets, 5 masks
> > > > > C 172.16.134.0/24 is directly connected, Serial0.2
> > > > > O IA 172.16.44.0/29 [110/65] via 172.16.134.4, 00:03:52,
> > > > Serial0.2
> > > > > O IA 172.16.22.0/27 [110/65] via 172.16.123.2, 00:03:52,
> > > > Serial0.1
> > > > > C 172.16.1.0/24 is directly connected, Serial1
> > > > > C 172.16.123.0/24 is directly connected, Serial0.1
> > > > > C 172.16.104.0/21 is directly connected, Loopback0
> > > > <-- This one --
> > > > > R1#
> > > > > !
> > > > > interface Loopback0
> > > > > ip address 172.16.111.1 255.255.248.0
> > > > > no ip directed-broadcast
> > > > > no ip route-cache
> > > > > ip ospf network point-to-point
> > > > >
> > > > > router ospf 110
> > > > > area 111 virtual-link 172.16.134.4
> > > > > network 172.16.111.0 0.0.0.7 area 11
> > > > > network 172.16.123.0 0.0.0.255 area 0
> > > > > network 172.16.134.0 0.0.0.255 area 111
> > > > >
> > > > > Routing table on another box shows the route..
> > > > >
> > > > > C 172.16.122.0/27 is directly connected, Loopback0
> > > > > C 172.16.22.0/24 is directly connected, Dialer0
> > > > > C 172.16.22.1/32 is directly connected, Dialer0
> > > > > C 172.16.123.0/24 is directly connected, Serial0.1
> > > > > O IA 172.16.104.0/21 [110/65] via 172.16.123.1,
> > > > 00:01:58, Serial0.1
> > > > > R2#
> > > > >
> > > > >
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