🛤️ Traceroute

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What is Traceroute?

Traceroute is a network diagnostic tool that shows the path packets take from your computer to a destination. It reveals every router (hop) between you and the target, along with response times at each point.

How to Read Traceroute Results

  • Hop Number: Sequential number of each router in the path
  • IP Address: The router's IP at that hop
  • Hostname: Reverse DNS name (if available)
  • Response Time: Round-trip time to that hop in milliseconds
  • * * *: No response (router may block ICMP)

Common Traceroute Issues

  • High Latency at One Hop: Possible congestion at that router Possible congestion at that router
  • Increasing Latency: Normal as distance increases Normal as distance increases
  • Timeout Stars: Some routers don't respond to traceroute packets Some routers don't respond to traceroute packets
  • Looping: Routing misconfiguration Routing misconfiguration

Frequently Asked Questions

What's the difference between ping and traceroute?

Ping tests connectivity to a single destination, while traceroute shows every intermediate hop along the path.

Why do some hops show * * *?

Many routers are configured to not respond to ICMP/UDP probes for security reasons. This doesn't necessarily indicate a problem.

Traceroute maps the path packets take from source to destination, showing every router hop with latency, helping identify where slowdowns or failures occur.

Key Facts

  • Average internet path has 12-15 hops
  • Written by Van Jacobson in 1987
  • Windows uses ICMP tracert, Linux uses UDP traceroute
  • Each hop typically adds 1-10ms latency

Frequently Asked Questions

What is traceroute used for?

Diagnosing network routing problems, identifying slow segments, verifying packet paths, and detecting outages.

How does traceroute work?

Sends packets with increasing TTL values. Each router decrements TTL and sends ICMP Time Exceeded when TTL reaches 0.

Why do some hops show asterisks?

Router did not respond — may block ICMP/UDP, have firewall rules, or be overloaded. A few timeouts are usually normal.

Difference between traceroute and ping?

Ping tests connectivity to one destination. Traceroute shows entire path with every intermediate router hop.

How many hops is normal?

Typically 10-20 hops. Fewer than 10 means close/well-peered. More than 20 may indicate suboptimal routing.

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