Oh Sure! Just go ahead and site actual data! Sheesh! What is the world coming to when people do their own sniffer traces and debugs and such instead of simply trusting the manuals... [=`) Thanks Marty! This is the kind of experimenting that we list members need to do more often! Z >From: Marty Adkins <[EMAIL PROTECTED]> >Reply-To: Marty Adkins <[EMAIL PROTECTED]> >To: Priscilla Oppenheimer <[EMAIL PROTECTED]>, [EMAIL PROTECTED] >Subject: Re: !H >Date: Mon, 20 Nov 2000 17:29:59 -0500 > >Priscilla Oppenheimer wrote: > > > > H means host unreachable. Jumping to the conclusion that there's a >routing > > problem isn't logical (though I know that what's the Tech Note document > > says.) The host could be turned off. A host unreachable happens when the > > last-hop router tries to ARP for the device and doesn't get a response. > > >This isn't what I've seen and captured with a protocol analyzer, nor >viewed via debug. If any router is missing an ARP entry (or any other >type of next-hop data link address), it will silently drop the packet. >The output of "debug ip packet" will report "encapsulation failed". > >OTOH, if any router in the chain lacks a route to the destination, that >router will generate an ICMP _host_ unreachable, not network unreachable. >I agree this is not intuitive, but here's the screen output from a >WinThing attempting to ping a bogus address, and the debug output from >its default gateway: > >C:\WINDOWS>ping 10.0.0.1 > >Pinging 10.0.0.1 with 32 bytes of data: > >Reply from 192.1.63.196: Destination host unreachable. >Reply from 192.1.63.196: Destination host unreachable. >Reply from 192.1.63.196: Destination host unreachable. >Reply from 192.1.63.196: Destination host unreachable. > >Ping statistics for 10.0.0.1: > Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), >Approximate round trip times in milli-seconds: > Minimum = 0ms, Maximum = 0ms, Average = 0ms >-------------------------------------------------------------------------------------- >06:47:58: ICMP: dst (10.0.0.1) host unreachable sent to 192.1.63.198 >06:47:59: ICMP: dst (10.0.0.1) host unreachable sent to 192.1.63.198 >06:48:00: ICMP: dst (10.0.0.1) host unreachable sent to 192.1.63.198 >06:48:01: ICMP: dst (10.0.0.1) host unreachable sent to 192.1.63.198 > > Marty Adkins Email: [EMAIL PROTECTED] > Mentor Technologies Phone: 410-280-8840 x3006 > 275 West Street, Plaza 70 WWW: http://www.mentortech.com > Annapolis, MD 21401 Cisco CCIE #1289 > >_________________________________ >FAQ, list archives, and subscription info: >http://www.groupstudy.com/list/cisco.html >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _____________________________________________________________________________________ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
