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Configuring IP Utilities
2-10
304234-A Rev 00
TFTP Overview
The Trivial File Transfer Protocol (TFTP) is a TCP/IP standard protocol for
transferring files with minimum capability and minimal overhead. TFTP is
implemented on top of the unreliable connectionless datagram delivery service
and is used to move files between network devices.
TFTP was designed to be small and easy to implement. Because it is small, it is
more restrictive, lacking most of the features of the File Transfer Protocol (FTP).
TFTP provides inexpensive, unsophisticated file-transfer service only. It cannot
list directories and provides no authentication.
TFTP runs on top of the User Datagram Protocol (UDP) and uses timeout and
retransmission to ensure that data arrives. Each file transfer begins with a request
to read or write to a file; this request also serves to ask for a connection. If the
server grants the request, the connection is opened and the file is sent in
fixed-length blocks (data packets) of 512 bytes. Each data packet contains one
block of data and must be acknowledged by an acknowledgment packet before the
next packet is sent. A data packet of less than 512 bytes terminates the transfer.
If a packet gets lost in the network, the intended recipient will time out and may
retransmit its last packet (which can be data or an acknowledgment), causing the
sender of the lost packet to retransmit the packet. Because the lock-step
acknowledgment guarantees that all older packets have been received, the sender
keeps one packet only on hand for transmission.
Change Working
Directory
CWD Causes the server to change the volume.
Print Working
Directory
PWD Causes the server to print its current working directory.
Implementation-specific FTP Commands
Compact COMP Causes the server to compact the flash card. Use this
command after the
delete
command, or when the amount of
contiguous space is low. You can determine the amount of
contiguous space on a router by using the
dir
command.
Table 2-3. FTP Commands Supported
(continued)
Command Code Description
- Configuring IP Utilities 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 304234-A Rev 00 10
- Before You Begin 17
- Text Conventions 18
- Acronyms 20
- How to Get Help 21
- Chapter 1 23
- Starting IP Utilities 23
- Starting Configuration Tools 24
- Starting TCP Services 26
- Starting FTP Services 27
- Starting TFTP Services 29
- Starting Telnet Services 30
- Starting NTP Services 32
- Starting NetBIOS over IP 34
- Starting the DNS Client 35
- Starting the DNS Proxy Server 37
- Chapter 2 39
- Overview of IP Utilities 39
- How TCP Works 40
- TCP Features 41
- TCP and IP Service Users 44
- FTP Overview 45
- How FTP Works 46
- Networks routers 47
- TFTP Overview 48
- Telnet Overview 49
- Telnet Server 50
- Telnet Client 51
- Figure 2-4. Telnet Client 52
- NTP Overview 53
- NTP Modes of Operation 56
- NetBIOS Overview 58
- NetBIOS in an IP Environment 59
- DNS Overview 62
- DNS Proxy Server 62
- How the DNS Cache Works 64
- Chapter 3 65
- Customizing TCP Services 65
- Disabling and Reenabling TCP 66
- Chapter 4 73
- Customizing FTP Services 73
- Disabling and Reenabling FTP 74
- Chapter 5 83
- Customizing TFTP Services 83
- Chapter 6 91
- Pausing Telnet Console Output 99
- Using the BCC 100
- Using Site Manager 100
- Changing the Login Timeout 101
- Changing the Password Timeout 102
- Changing the Command Timeout 103
- Changing Login Retries 104
- Customizing Telnet Services 107
- Changing the History File 109
- Changing the Remote Port 112
- Changing the Command Prompt 113
- prompt system1 114
- Chapter 7 115
- Customizing NTP Services 115
- Disabling and Reenabling NTP 116
- Adding Remote Time Servers 119
- Setting Local Host Mode 122
- Specifying Peer Preference 124
- Chapter 8 131
- Customizing NetBIOS over IP 131
- Configuring a NetBIOS Cache 134
- 15-character entity 135
- Aging a Cache Entry 137
- Customizing a Cache Search 138
- Chapter 9 147
- Customizing the DNS Client 147
- Disabling the Recursion Bit 151
- Modifying the DNS Server List 153
- Deleting DNS from the Router 158
- Chapter 10 161
- Customizing the DNS Proxy 161
- Appendix A 163
- Site Manager Parameters 163
- TCP Global Parameters 164
- FTP Global Parameters 166
- TFTP Parameters 169
- NTP Parameters 178
- NetBIOS Global Parameters 182
- DNS Global Parameters 190
- DNS Server Record Parameters 194
- DNS Proxy Server Parameters 195
- IP Accounting Parameters 204
- Appendix B 207
- Site Manager Default Settings 207
- FTP Parameters 208
- Telnet Parameters 209
- NetBIOS over IP Parameters 211
- DNS Client Parameters 212
- DNS Server Parameters 213
- Appendix C 215
- Configuring IP Accounting on 215
- (continued) 217
- Appendix D 219
- Specifying the Policy Action 221
- Specifying the IP Service 222
- Specifying the Precedence 223
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