At 03:25 PM 11/20/00, Chris Larson wrote:
>Even if this was correct you cannot simply by getting an !h say that this is
>from an access-list. There are many reasons for a host unreachable message.
>
>Also, from most workstations (Windows that is), you will simply get a
>timeout and neither !A or !h from packets being denied by an access-list.
Sending a Destination Unreachable is the job of the Router, not the
workstation. Whether it sends an A, H, or nothing depends on the
implementation of ICMP that it is running.
Priscilla
>----- Original Message -----
>From: "Rossetti, Stan" <[EMAIL PROTECTED]>
>To: "'Jennifer Cribbs'" <[EMAIL PROTECTED]>; "cisco"
><[EMAIL PROTECTED]>; "Rossetti, Stan" <[EMAIL PROTECTED]>
>Sent: Monday, November 20, 2000 2:23 PM
>Subject: RE: !H !H !H!H
>
>
>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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> >>Richard Bosire
> >>Network Engineer CCNA,CCSE
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> >>
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Priscilla Oppenheimer
http://www.priscilla.com
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