ttl

ttl is a modern replacement for traceroute that provides fast continuous path monitoring with a real-time terminal user interface. It offers advanced network diagnostics including ECMP detection, path MTU discovery, NAT identification, and route flap alerts, along with rich data enrichment.

Features

• Real-time TUI: Interactive terminal interface with multiple theme options
• Multi-target tracing: Simultaneously trace paths to multiple destinations
• ECMP detection: Classify and enumerate equal-cost multi-path routes
• Path MTU discovery: Binary search to find maximum transmission unit
• NAT detection: Identify network address translation and transparent proxies
• Route monitoring: Detect and alert on route flaps and changes
• Data enrichment: Includes ASN lookup, GeoIP, reverse DNS, and IX detection
• MPLS parsing: Extract and display MPLS labels from ICMP extensions
• Multiple protocols: Support for ICMP, UDP, and TCP probes
• Export options: Save sessions in JSON, CSV, and text formats

Basic usage

ttl example.com                         # Trace path to example.com in real-time.
ttl -c 10 example.com                   # Send 10 probes to example.com.
ttl -p tcp example.com                  # Use TCP probes instead of ICMP.
ttl --mtu example.com                   # Discover path MTU to destination.