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TCP, FTP, Telnet, and NTP Concepts
114071 Rev. A 2-5
TCP Memory Considerations
The Transmission Control Protocol requires a significant amount of memory to
• Retain copies of outbound data in case they must be retransmitted
• Retain copies of inbound data in case they are received out of order and must
be rearranged
• Manage the TCP connections
The amount of memory used per TCP connection is dynamic. Each connection
uses a small amount of overhead memory (less than 1 KB), even if the connection
is idle. As the size of the transmit-and-receive window increases, so does the
memory for connections. It expands as much as TCP allows.
You can control the window size by setting a value for the Max. Window Size
parameter in the Edit TCP Global Parameters window (see Chapter 3). The
maximum amount of memory TCP can use for a connection is equal to the
overhead memory plus twice the window size (because the window can fill in both
directions).
FINWAIT-2 (7) TCP waits for a connection termination request from the remote
TCP.
CLOSEWAIT (8) TCP waits for a connection termination request from the client.
CLOSING (10) TCP waits for a connection termination request acknowledgment
from the remote TCP.
LASTACK (9) TCP waits for acknowledgment of the connection termination
request previously sent to the remote TCP.
TIMEWAIT (11) TCP waits for enough time to pass to ensure that the remote TCP
received the acknowledgment of its connection termination
request.
CLOSED (1) No connection.
Table 2-2. TCP Connection States
(continued)
State Definition
- Configuring IP Utilities 1
- Bay Networks Software License 3
- Contents 5
- 114071 Rev. A vii 7
- 114071 Rev. A ix 9
- 114071 Rev. A xi 11
- 114071 Rev. A xiii 13
- About This Guide 15
- Before You Begin 16
- Conventions 16
- Acronyms 17
- 114071 Rev. A 18
- 114071 Rev. A xix 19
- Bay Networks Customer Service 20
- World Wide Web 21
- Customer Service FTP 21
- Support Source CD 22
- CompuServe 22
- InfoFACTS 23
- How to Get Help 23
- Chapter 1 25
- Configuring IP on a Circuit 26
- Starting TCP 26
- Starting FTP 27
- Starting Telnet 28
- Starting NTP 29
- Where to Go Next 30
- Chapter 2 31
- How TCP Works 32
- TCP Features 32
- 2-4 114071 Rev. A 34
- (continued) 35
- TCP0001A 36
- FTP Overview 37
- TCP0002A 38
- Networks routers 39
- Telnet Overview 40
- TCP0005A 42
- NTP Overview 43
- NTP Architecture 43
- TCP0007A 44
- NTP Client Modes 45
- Unicast Client Mode 45
- TCP0006A 46
- Chapter 3 49
- Customizing TCP Services 49
- Configuring TCP on the Router 50
- Chapter 4 53
- Customizing FTP Services 53
- 4-2 114071 Rev. A 54
- Chapter 5 57
- Customizing Telnet Services 57
- 5-2 114071 Rev. A 58
- 5-4 114071 Rev. A 60
- 5-6 114071 Rev. A 62
- Chapter 6 65
- Customizing NTP Services 65
- Configuring NTP on the Router 66
- Adding Time Servers 67
- Setting Config Peer Mode 67
- Setting Local Host Mode 68
- Specifying Peer Preference 68
- Configuring NTP Access Control 69
- Appendix A 71
- Parameter Descriptions 71
- TCP Global Parameters 72
- FTP Global Parameters 74
- 76
- 76
- 77
- A-10 114071 Rev. A 80
- A-14 114071 Rev. A 84
- NTP Global Parameters 85
- A-16 114071 Rev. A 86
- 87
- A-18 114071 Rev. A 88
- Appendix B 91
- Site Manager Default Settings 91
- FTP Parameters 92
- Telnet Parameters 93
- NTP Parameters 94
- 114071 Rev. A Index-1 95
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