![]() Traceroute, sourced from Cisco devices, uses UDP packets with unreachable port by default to get “icmp port unreachable” packet from designated router to check the path connectivity. 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.“ This process continues until the packets actually reach the other destination. ![]() 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.Īnother three UDP messages are now sent, each with the TTL value set to 2, which causes the second router to return ICMP TEMs. Three datagrams are sent, each with a Time-To-Live (TTL) field value set to one. 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. “The traceroute command is used to discover the routes that packets actually take when traveling to their destination. s-software/ios-software-releases-121-mainline/1277. ![]() We have a good document which explains traceroute command for Cisco routers. Let’s review how traceroute works on Cisco routers. Traceroute is useful tool to check path across IP networks. ![]()
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