The real important thing when working with computers in the real world to
remember is:(and you will make it)
1. Don't ever say, always or never to an engineer. They will prove you
wrong.
2. Read the vendor docs but don't believe them. Test everything!!! I work in
a test lab environment in which we certify hardware and software before we
place it on our network. Which is in the millions of hosts. We are a
communications company. I made the same mistake early on to the other
computer/network/electrical engineers I work with by saying "the
documentation says" when they all got up off the ground and stopped laughing
at me. They told me, if we went by what the documentation says we would not
need a test lab, we would all lose our job, and that salesmen would rule the
world not engineers.
3. Reinvent yourself every 6 months. There is no such thing as old in
engineering just
A. Obsolete - we don't use it anymore
B. Foundation - what all new is built on
C. New - what we use today, but will be either A or B tomorrow.
4. The engineering creed -
a. Keep it simple.
b. Don't reinvent the wheel.
My personal favorite:
c. Don't work any harder than you have to.
These 4 also make a good Network Engineer so apply them, they have gotten
me where I want to be.
I definitely would like to see the results of your testing.
If you can please send the test methodolgy, results, and config for the
test. i would appreciate that.
Don
----- Original Message -----
From: Jennifer Cribbs <[EMAIL PROTECTED]>
To: Donald B Johnson Jr <[EMAIL PROTECTED]>; cisco
<[EMAIL PROTECTED]>
Sent: Monday, November 20, 2000 1:38 PM
Subject: RE: !H !H !H!H I GOT IT!! THANKS ALL!
You are correct!! And I have got tons of e-mail regarding this. I stand
humbled before everyone. And I do understand. I was just telling my
husband
about this and he laughed. He is used to me thinking I am always correct.
The good thing about this, is that I have learned about !A and !H and I want
to thank everyone. The real world is different and you wait guys...I will
be
there one day.
Jennifer Cribbs
[EMAIL PROTECTED]
>===== Original Message From "Donald B Johnson Jr" <[EMAIL PROTECTED]>
=====
>jennifer
>the reason people are jumping on this is because you stated something and
>then on a line under it you said
>and that is it or something to that effect.
>have you tried it out in the lab environment, that would be the answer not
>what is in a book, which are flawed.
>Duck
>----- Original Message -----
>From: Jennifer Cribbs <[EMAIL PROTECTED]>
>To: Rossetti, Stan <[EMAIL PROTECTED]>; cisco
><[EMAIL PROTECTED]>
>Sent: Monday, November 20, 2000 11:45 AM
>Subject: RE: !H !H !H!H
>
>
>This is where I am getting my info..
>
>Ref: chapter 8 of Intro to Cisco Router Configuration
>pages 229-230
>
>It says responses to trace command include:
>!H The probe was rceived by the router, but not forwarded, usually due to
>an
>access list.
>P The protocol was unreachable
>N The network was unreachable
>U The port was unreachable
>* Timout
>
>Jennifer Cribbs
>[EMAIL PROTECTED]
>
>
>
>
>
>>===== Original Message From "Rossetti, Stan" <[EMAIL PROTECTED]>
>=====
>>Are you sure? Page 1163 of Cisco IOS Configuration Fundamentals states
>that
>>the character A signifies that the destination is "Administratively
>>Unreachable. Usually, this output indicates that an access list is
>blocking
>>traffic."
>>
>>-----Original Message-----
>>From: Jennifer Cribbs [mailto:[EMAIL PROTECTED]]
>>Sent: Monday, November 20, 2000 1:13 PM
>>To: cisco; [EMAIL PROTECTED]
>>Subject: RE: !H !H !H!H
>>
>>
>>On the traceroute command:
>>
>>!H is returned 3 times if an access list prevents a router from forwarding
>>the
>>packet to the HOST. The 'trace' command is used to determine the route
>>taken
>>to a remote host. All the hops are shown as the trace probe moves toward
>>the
>>destination. Three probes are issued. The response time of each probe
>will
>>
>>be displayed if successful.
>>
>>The trace command returns a N if the network is unreachable.
>>The P is the response if the protocol is unreachable.
>>An * is a timeout.
>>!H is the return for what I said above but it is regarding a traceroute
>>command,
>>and not a ping.
>>
>>Jennifer Cribbs
>>[EMAIL PROTECTED]
>>
>>
>>
>>>===== Original Message From "Rossetti, Stan"
<[EMAIL PROTECTED]>
>>=====
>>>I thought !A meant this path is blocked by an access list.
>>>
>>>-----Original Message-----
>>>From: Jennifer Cribbs [mailto:[EMAIL PROTECTED]]
>>>Sent: Monday, November 20, 2000 12:13 PM
>>>To: [EMAIL PROTECTED]
>>>Subject: RE: !H not a complete answer
>>>
>>>
>>>This response is returned when an access list somewhere along the path
>>>prevents a router from forwarding a packet to the HOST.
>>>
>>>and that is correct.
>>>
>>>Jennifer Cribbs
>>>[EMAIL PROTECTED]
>>>
>>>
>>>===== Original Message From "Croyle, James" <[EMAIL PROTECTED]>
>=====
>>>http://www.cisco.com/warp/public/112/chapter7.htm
>>>
>>>I think you have a routing loop as is described here. Ping from several
>>>stations and map it out.
>>>
>>>Jim
>>>
>>>
>>>-----Original Message-----
>>>From: Miller, Nathan (AZ15)
>>>To: Richard Bosire; Jason yee
>>>Cc: John Huston; [EMAIL PROTECTED]
>>>Sent: 11/20/00 11:15 AM
>>>Subject: RE: !H
>>>
>>>Does it meas that the destination NETWORK is unreachable or the
>>>destination
>>>HOST??
>>>
>>>-----Original Message-----
>>>From: Richard Bosire [mailto:[EMAIL PROTECTED]]
>>>Sent: Monday, November 20, 2000 8:01 AM
>>>To: Jason yee
>>>Cc: John Huston; [EMAIL PROTECTED]
>>>Subject: Re: !H
>>>
>>>
>>>destination unreachable i.e not path to the destination network
>>>
>>>Jason yee wrote:
>>>
>>> hi anyone knows what does the symbol !H means in
>>> traceroute results
>>>
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