TTL (time-to-live) is a crucial network parameter that limits the lifespan of data packets and helps prevent routing loops. It is also utilized in tools like traceroute and by security analysts for OS fingerprinting. #ICMP #Nmap
Keypoints
- TTL decreases by 1 each time a packet passes through a router.
- A TTL value of 0 causes the packet to be discarded, preventing infinite looping.
- Traceroute manipulates TTL values to map the network path between source and destination.
- The TTL value in ping replies can indicate the number of hops a packet has traveled.
- Operating systems set different default TTL values, which can be exploited for OS fingerprinting.
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