!H simply means that the host is unreachable. Whether this is because of an
access list or that the host is disconnected or turned off is left to the
imagination of the person receiving the !H notification. Odds are that
unless you have physical access to the host in question you will not ever
learn why the host was unreachable.
Gragg Vaill
NOS Contractor
Sprint ION NOC
Kansas City, Ks.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Jennifer Cribbs
Sent: Monday, November 20, 2000 1:46 PM
To: Rossetti, Stan; cisco
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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