IP
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Internal
IPv4 Header
Version
IHL
DSCP
ECN
Total Length
Identification
Flags
Fragment Offset
Time To Live
Eight-bit counter that prevents the datagram being routed endlessly. It represents the hop count: when the datagram arrives at a router, the router decrements TTL field by one. If the value after decrement is zero, the router drops the datagram and sends a "ICMP Time Exceeded" to the sender. The field is used by the traceroute implementation.