From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Tue Nov 15 2005 - 17:15:09 GMT-3
Cisco also uses UDP in the IOS. Remember that traceroute is a technique
and not just an application.
Traceroute is a technique designed to have the routers between the
source and destination reveal themselves and finally have the
destination respond. How this is done is up to the developer of the
traceroute application. It can be done by sending UDP packets, ICMP
pings, or TCP SYN packets.
Below is an example of TCP based traceroute:
[root@CoachZ root]# tcptraceroute -n www.cisco.com
tcptraceroute: Symbol `pcap_version' has different size in shared
object, consider re-linking
Selected device eth3, address 172.16.22.93, port 46862 for outgoing
packets
Tracing the path to www.cisco.com (198.133.219.25) on TCP port 80, 30
hops max
1 172.16.22.1 (172.16.2.1) 2.866 ms 2.903 ms 3.134 ms
2 202.11.141.254 (202.11.141.254) 13.509 ms 10.969 ms 10.754 ms
3 66.209.64.41 (66.209.64.41) 26.493 ms 29.727 ms 28.973 ms
4 4.78.204.181 (4.78.204.181) 37.845 ms 37.717 ms 37.981 ms
5 4.68.102.33 (4.68.102.33) 59.187 ms * 35.201 ms
6 4.68.128.157 (4.68.128.157) 33.069 ms 32.342 ms 33.363 ms
7 4.68.123.169 (4.68.123.169) 33.593 ms 33.722 ms 32.330 ms
8 4.0.26.14 (4.0.26.14) 50.450 ms 49.188 ms 50.715 ms
9 128.107.239.53 (128.107.239.53) 121.395 ms 213.723 ms 219.820 ms
10 128.107.224.69 (128.107.224.69) 50.057 ms 51.819 ms 49.954 ms
11 198.133.219.25 (198.133.219.25) [open] 48.979 ms 55.295 ms 54.803
ms
[root@CoachZ root]#
HTH,
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Danshtr
Sent: Tuesday, November 15, 2005 10:27 AM
To: Cisco certification; Security@Groupstudy.Com
Subject: trace route - why unix is using UDP for trace route?
Hello all,
While studying for the written security exam, I noticed this link:
http://www.kohala.com/start/papers.others/vanj.99feb08.txt
-- Best regards, Dan
This archive was generated by hypermail 2.1.4 : Thu Dec 01 2005 - 09:12:06 GMT-3