Trace route

1. Trace route
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2. • Traceroute is a CLI (Command-line interface)-based tool
used to identify the path used by a packet to reach its
target.
• This tool also uses ICMP messages, but unlike ping,
identifies every router in a path.
• Traceroute is useful when troubleshooting network
problems because it can help identify where exactly the
problem is.
• Traceroute sends a series of ICMP echo request packets
to a destination.
• First series of messages has a Time to Live (TTL)
parameter set to 1, which means that the first router in a
path will discard the packet and send an ICMP Time
Exceeded message.
• TTL is then increased by one until the destination host is
reached and an ICMP echo reply message is received.
• Originating host can then use received ICMP messages
to identify all routers in a path.

3. • The traceroute command on Windows is named tracert.
• On Unix and Cisco IOS traceroute it is invoked using
the traceroute command.
=> Here is an example showing the tracert command in Windows: