Книга: Iptables Tutorial 1.2.2

Initialization and association

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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