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.

Protocol

Header Checksum

Source IP Address

=Destination IP Address

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