RE: [nsp] Cisco ios traceroute VS. windows tracert ?

From: Marcus Keane (mkeane@microsoft.com)
Date: Wed Nov 28 2001 - 20:18:09 EST

Micky, The router isn't listening on that port. The traceroute program
on a Cisco sends packets to that port and when it gets a "destination
port unreachable" message(because the router isn't listening on that
port), it knows that the trace is complete.
Marcus.

        -----Original Message-----
        From: micky [mailto:micky@apol.com.tw]
        Sent: 29 November 2001 10:05
        To: swm@emanon.com
        Cc: cisco-nsp@puck.nether.net
        Subject: Re: [nsp] Cisco ios traceroute VS. windows tracert ?
        
        
        Hi Scott
            
              Thanks for providing information
              You said Cisco listening-UDP port number is 33434 for
tracerouting ,but I can't scan the port with scan tools
              Is it hidden port ?
         
                                       Micky

                ----- Original Message -----
                From: Scott Morris <mailto:swm@emanon.com>
                To: 'micky' <mailto:micky@apol.com.tw> ;
cisco-nsp@puck.nether.net
                Sent: Wednesday, November 28, 2001 8:18 PM
                Subject: RE: [nsp] Cisco ios traceroute VS. windows
tracert ?

                You have the right idea, just a little backwards!
                 
                Cisco IOS traceroute, like unix traceroute is a
UDP-based system. It sends out packets destined to a high UDP port
(33434 by default).
                 
                Microsoft tracert on the other hand functions just like
a ping. It sends out ICMP echo packets incrementing the TTL in the same
fashion.
                 
                So depending on access-lists on routers between you and
your destination, you may get very different results (and perhaps
different paths) depending on which box you run the trace from.
                 
                Hope that helps!
                 
                Scott

                        -----Original Message-----
                        From: micky [mailto:micky@apol.com.tw]
                        Sent: Wednesday, November 28, 2001 5:10 AM
                        To: cisco-nsp@puck.nether.net
                        Subject: [nsp] Cisco ios traceroute VS. windows
tracert ?
                        
                        
                        Hi Mr.techs
                         
                              I have a little confusing about traceroute
function between cisco ios and windows utility
                              Sometimes I used "tracert -d" x.x.x.x
command under windows,it can go through all nodes and display ip address
of all
                              But using traceroute under IOS,it can goes
through all and display * * *
                              Somebody told me tracert is
UDP-designed,traceroute is ICMP-designed
                              I don't know if it's real or not ?
                         
                              Thanks
                                                          Micky
                                
                             
                         

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