Traceroute is the program that shows you the route over the network between two systems, listing all the intermediate routers a connection must pass through to get to its destination. It can help you determine why your connections to a given server might be poor, and can often help you figure out where exactly the problem is. It also shows you how systems are connected to each other, letting you see how your ISP connects to the Internet as well as how the target system is connected.
The Traceroute Command on Cisco router:
The traceroute command is used to discover the routes that packets actually take when traveling to their destination. The device (for example, a router or a PC) sends out a sequence of User Datagram Protocol (UDP) datagrams to an invalid port address at the remote host.
Three datagrams are sent, each with a Time-To-Live (TTL) field value set to one. The TTL value of 1 causes the datagram to "timeout" as soon as it hits the first router in the path; this router then responds with an ICMP Time Exceeded Message (TEM) indicating that the datagram has expired.
Another three UDP messages are now sent, each with the TTL value set to 2, which causes the second router to return ICMP TEMs. This process continues until the packets actually reach the other destination. Since these datagrams are trying to access an invalid port at the destination host, ICMP Port Unreachable Messages are returned, indicating an unreachable port; this event signals the Traceroute program that it is finished.
Example: Router1#traceroute 22.214.171.124
If you're stuck with Windows, the command is called tracert. Open a DOS window and enter the command:
On a Unix system, including Mac OS X, run a traceroute at the command line like this:
Hi Team,I have this server with ip 10.4.1.122 and trying to reach other end server 10.4.7.100 (192.168.31.3). once it reach the router we have done a source and destination nat. So 10.4.1.122 become 10.20.30.21 and Destination become 10.4.7.100 to 192.168...
Good day, Our Cisco Router 1921 Series failed PCI scans on Weak IPsec Encryption Settings port 500/udp. More information on the scan results, THREAT:This host contains an ISAKMP/IKE key exchange server to negotiate encryption keys for IPsec...
Network Insider Live Webinar
Tuesday, June 23, 2020 10:00 am Pacific Time (San Francisco, GMT-08:00)
Learn how Software-Defined Access and new innovations in Cisco DNA Center provide a better way to control your network. We will explore new enhancements, ...
Hi, Seems like I'm having this weird issue on my network that a specific IP block under switch1 vrf cust instance experiencing some delay or issue when accessing/connecting to a public proxy server and sometimes this cause delay when browsing using t...