Time to live
Time to live (TTL) or hop limit is amechanism that limits the lifespan or lifetime of data in a computer ornetwork. TTL may be implemented as a counter or timestamp attached to or embeddedin the data. Once the prescribed event count or timespan has elapsed, data isdiscarded. In computer networking, TTL prevents a data packet from circulatingindefinitely. In computing applications, TTL is used to improve performance ofcaching or to improve privacy.
IP packets
Under the Internet Protocol, TTL is an8-bit field. In the IPv4 header, TTL is the 9th octet of 20. In theIPv6 header, it is the 8th octet of 40. The maximum TTL value is255, the maximum value of a single octet. A recommended initial value is 64.
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