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IP header is appended to the packet in the network layer. It depends whether its an IPv4 header or IPv6 Header. IPv4, the important fields are protocol, 32 bit src address, 32 bit destination address (these are kind of the main ones) others would be ttl, checksum, payload etc. and in IPv6 the important ones are 128 bit src address and 128 bit destination address and next header (which specifies which protocol to use)
- Bubba Ali March 06, 2009