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edited Dec 27, 2018 at 1:39

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ipv4 tcp layer3 layer4 rfc

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edited Dec 18, 2016 at 0:00

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ipv4 tcp layer3 layer4

Tweeted twitter.com/#!/StackNetworkEng/status/549234746631663616

occurred Dec 28, 2014 at 16:05

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asked Dec 28, 2014 at 2:26

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Why is the IP layer aware of higher layers in the network stack?

In the IP packet header there is an 8-bit Protocol field (at offset 9) that holds the "next level protocol", with assigned numbers given in RFC 790. For example, TCP is 6. My question is, why is the IP layer aware of higher layers in the network stack?

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ipv4 tcp