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The transmitting TCP decrements the number in the window
field and when it reaches zero, the transmitting TCP stops
sending data. When the receiving TCP can accept more
data, it increases the number in the window field. In
practice, a single packet can acknowledge the receipt of
data and give permission for more data to be sent.
IP
TCP sends its packets to IP with the source and destination
IP addresses. IP is only concerned with these IP addresses.
It is not concerned with the contents of the packet or the
TCP header.
IP finds a route for the packet to get to the other end of the
TCP connection. IP adds its own header to the packet to
accomplish this.
The IP header contains the source and destination
addresses, the protocol number, and another checksum.
The protocol number tells the receiving IP which protocol to
give the packet to. Although most IP traffic uses TCP, other
protocols can be used (such as UDP).
The checksum is used by the receiving IP in the same way
as the TCP checksum.
9033691-01
Figure 2-11. IP Packet Header
VH-2402-L3 Management Guide 153
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