The last mail I read before my response was about a
sarcastic remark from somebody on this list, somebody
actually took this up with his boss because he had a
signature just like Kevin. My question is, is this
what this board has come to? Ok, lets ignorantly agree
that you are right, is this the best way to put it
across to me? I believe you are a great engineer for
Quest and that you are a juniper expert, could this be
the difference between cisco and juniper boxes?
I have learnt alot from this group, I will not allow
you to change my perception of the well cultured
members of this group.
--- kevin jones wrote:
Can you explain to me how you can telnet into the
router if "all interfaces fail" with the exception of
the loopback interface? If ALL interfaces fail,
the only way you can get to the router is via console
or AUX. And you call yourself a CCNP. No
wonder the value of Cisco certification value (with
the exception of the CCIE) is becoming less desirable
these days.
Kevin
Juniper Network Certified Internet Expert
(JNCIE)
Qwest Communiations
>From: "Inno. Ama"
>Reply-To: "Inno. Ama"
>To: [EMAIL PROTECTED]
>Subject: Re: what is loopback interface
for ? [7:9493]
>Date: Fri, 22 Jun 2001 14:57:53 -0400
>
>Sue,
>
>In addition to what ER had to say, the
main purpose of
>loopback address is actually contained
in your
>question.....loopback interface is
always up/up, and
>this helps you to possibly get into the
router when
>there is problem and all interfaces
fail, now you can
>see what is going on and troubleshoot
after you have
>telneted into the router....
>
>inno/ccnp
>--- Ednilson Rosa wrote:
> > Sorry,
> >
> > Just a correction: the mask
usually used for a
> > loopback intf is /32
> > (255.255.255.255) and not /24
(255.255.255.0).
> >
> > Rgards,
> >
> > ER
> > CCNA
> >
> > ----- Original Message -----
> > From: "Ednilson Rosa"
> > To:
> > Sent: Friday, June 22, 2001 1:20
PM
> > Subject: Re: what is loopback
interface for ?
> > [7:9493]
> >
> >
> > A loopback interface may be used
for many purposes.
> > You may use it as the
> > end of a tunnel on a VPN
configuration or you may
> > configure it just to have
> > a stable router-id for OSPF, for
instance.
> >
> > You don't need to configure it.
They are optional
> > and you may use any
> > address you want. If loopback
intfs are following a
> > specific address scheme
> > in your network, then they must
be planned for some
> > specific function by who
> > designed the network. You should
not change it
> > before knowing what function
> > is this (what may be achieved by
analyzing your
> > configuration carefully).
> >
> > The subnet mask used on a
loopback intf isn't also
> > necessarily /24. This is
> > frequently used though, to
economize address space,
> > since you don't need to
> > differentiate network and host on
this segment. In
> > this case, host and
> > network are the same and routing
is performed with
> > no problem.
> >
> > ER
> > CCNA
> >
> > ----- Original Message -----
> > From: "Susan Stone"
> > To:
> > Sent: Friday, June 22, 2001 7:22
AM
> > Subject: what is loopback
interface for ? [7:9493]
> >
> >
> > Hi,
> >
> > I always wonder what is loopback
interface for? Can
> > anyone explained its
> > function? Can we don't configure
the loopback
> > interface. Our WAN Lookback
> > always start with 192.168.X.X
why? Must we use
> > private IP? I found I can
> > telnet to a remote router using
its loopback IP.
> > But I wonder How I route
> > as it always have the subnet mask
of
> > 255.255.255.255. Then which is
the
> > network and which the host
> >
> > Susan
> >
>_________________________________________________________________________
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>
>
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