Книга: Iptables Tutorial 1.2.2

Initialization and association

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Initialization and association

Each connection is initialized by creating an association between the two hosts that wants to talk to each other. This association is initialized when a user needs it. It is later used as needed.

The initialization is done through 4 packets. First an INIT chunk is sent, which is replied to with an INIT ACK containing a cookie, after this the connection can start sending data. However, two more packets are sent in the initialization. The cookie is replied to with a COOKIE ECHO chunk, which is finally replied to with a COOKIE ACK chunk.

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