HP Digital NetRider Instrukcja Użytkownika Strona 303
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Configuring and Managing SLIP Ports 15-7
Managing the Maximum Transmission Unit
Managing the Maximum Transmission Unit
Introduction
The maximum transmission unit (MTU) value specifies the maximum size of the
datagram that a given access server port accepts. The range is 64 to 1500 bytes. The
default is 1500 bytes.
Changing the MTU
You can change the MTU value using the SET/DEFINE/CHAGE PORT
n
MTU
command. If you use the SET or CHANGE command, the new value does not affect
an existing SLIP connection.
MTU Change Example:
The following example makes the access server compatible with attached hosts that
have fixed MTU values other than 1006 bytes:
Local> DEFINE PORT 4 SLIP MTU 500
Relationship of the TCP Maximum Segment Size and the MTU
An attached host announces the TCP maximum segment size (MSS) at connection
time. The MSS specifies the largest fragment of a datagram that the attached host is
willing to receive. The MSS is normally based on the MTU of the network connection
as recommended by RFC 879.
The MSS should always be smaller than the MTU value. The TCP and IP headers
account for the difference between the two values.
Fragmentation
When the TCP MSS announced by the SLIP host exceeds the MTU on the SLIP line,
IP fragmentation occurs. Therefore, an MSS value that greatly exceeds the MTU
causes excessive fragmentation and downgrades performance.
Setting the MTU adjusts the point at which IP fragmentation occurs when sending
datagrams. Setting the MTU also adjusts the maximum receive unit (MRU) packet
size. Since the access server considers packets larger than the MTU as framing errors,
it discards these packets.
- DIGITAL NetRider 1
- Network Access Server 1
- Management 1
- Contents 3
- 3 User Interface 4
- 4 Managing Load Hosts 5
- 8 Managing AppleTalk 9
- 14 Configuring LPD Printers 15
- (TN3270) 18
- 20 Managing IPX 20
- 21 Managing Dial Services 21
- 23 Accounting 24
- Glossary 25
- Conventions 28
- Associated Documents 29
- Correspondence 31
- Chapter 1 33
- DNAS Management 33
- Configuration Tasks 34
- System Management Tasks 35
- User Tasks 36
- Memory Types 37
- Power Loss 37
- Chapter 2 39
- Management Tools 39
- Access Server Commands 40
- User Groups 41
- Command Definitions 41
- Privileged Commands 42
- HELP TUTORIAL Command 43
- HELP Command 43
- Console Port 44
- Remote Console Port 45
- Network Control Program (NCP) 46
- Telnet Remote Console 49
- 2-12 Management Tools 50
- Access Server Manager 51
- Chapter 3 53
- User Interface 53
- Command Groups and Menus 54
- Using Command Groups 55
- Executing a Command Group 56
- Displaying a Command Group 56
- Purging a Command Group 56
- Using Menus 57
- Menu Windows 58
- Defining Menus 60
- Main Menu Display 61
- Defining Menu Choices 61
- Displaying a Selected Menu 62
- Exiting from a Menu 63
- Displaying a Menu Definition 63
- Chapter 4 65
- Managing Load Hosts 65
- Load Host Procedures 66
- DSV$CONFIGURE 67
- ADD Command 68
- MODIFY and SET Commands 69
- DELETE Command 69
- LIST and SHOW Commands 70
- CONNECT and USE Commands 70
- DSVCONFIG 73
- Using a BOOTP/TFTP Server 74
- Remote Connection Password 75
- Upline Dumping 76
- Terminal Server Manager (TSM) 77
- Chapter 5 79
- Using the INITIALIZE Command 82
- Updating Flash RAM 83
- Local> INITIALIZE DISABLE 84
- NCP Initialization Commands 85
- NCP Reference 85
- Booting from the Network 86
- Boot Command Options 88
- Chapter 6 91
- LAT Characteristics 92
- Command To Use 94
- ANNOUNCEMENTS Characteristic 95
- CIRCUIT TIMER Characteristic 96
- IDENTIFICATION Characteristic 97
- Keepalive Timer Example 98
- Introduction 100
- Default Access Server Name 100
- NODE LIMIT Characteristic 101
- Access SERVER NUMBER Values 102
- PASSCHECK Characteristic 103
- QUEUE LIMIT Characteristic 104
- RETRANSMIT LIMIT Values 105
- RESPONDER Characteristic 106
- Service Groups 108
- Chapter 7 109
- Setting the Internet Address 111
- Displaying the DNS Counters 117
- Field Description 118
- Changing the Time Limit 120
- Changing the Retry Limit 120
- 192.33.4.12 ROOT 121
- 99.99.99.99 LOCAL 122
- Configuring a Default Gateway 124
- 255.255.255.0 125
- Defining an ARP Entry 126
- What the Timer Does 127
- Setting the Timer 127
- Disabling the Timer 127
- Setting Timer Retries 127
- Using the SHOW Command 129
- BOOTP Server Configuration 133
- Learning Operation 133
- Local> LIST INTERNET 134
- Description 135
- BOOTP and DHCP Differences 135
- DHCP Client Operation 136
- DHCP Proxy Operation 137
- Enabling and Disabling DHCP 138
- Displaying the DHCP Setting 138
- Configuring Default Values 138
- What Does WINS Do? 139
- What Is WINS Autoconfigure? 139
- Operation 139
- Assigning WINS Addresses 140
- Chapter 8 143
- Managing AppleTalk 143
- Overview 143
- AppleTalk Address Format 144
- Enabling AppleTalk 144
- Disabling AppleTalk 145
- 8-4 Managing AppleTalk 146
- Commands 147
- Displaying AppleTalk Counters 148
- Managing AppleTalk 8-7 149
- 8-8 Managing AppleTalk 150
- AARP Values 151
- Displaying AppleTalk Status 152
- Managing AppleTalk 8-11 153
- Displaying AppleTalk Routes 154
- Managing AppleTalk 8-13 155
- Managing AppleTalk 8-15 157
- Chapter 9 159
- AUTOBAUD 164
- CHARACTER SIZE 165
- STOP BITS 166
- Flow Control Types 168
- XON/XOFF 168
- FLOW CONTROL Direction 170
- Specifying DSRLOGOUT 171
- Specifying LONGBREAK LOGOUT 171
- Specifying INACTIVITY LOGOUT 172
- Chapter 10 173
- Configuring Modem Signals 173
- DTE/DCE Device Configuration 174
- Modem Signals Description 177
- Computer Interface 179
- Local> LOGOUT PORT 5 180
- Local> LOGOUT PORT 11 180
- Specifying SIGNAL SELECT 181
- Specifying SIGNAL CHECK 182
- Specifying DTRWAIT 183
- Specifying RING 184
- Specifying ALTERNATE SPEED 185
- Specifying DIALUP 186
- Sample Modem Configurations 187
- MODEM CONTROL Sequences 190
- Disconnecting 191
- Chapter 11 195
- Managing Users 196
- Managing Sessions 196
- Sample Network Configuration 198
- Specifying AUTOCONNECT 199
- Specifying AUTOPROMPT 200
- Specifying Failover 201
- Configuring Port Queuing 201
- Reference 206
- How to Configure 207
- Logging In with Multisessions 209
- Disable Switch Character 210
- Buffer Size 211
- Profiles Types 212
- Profile Characteristics 212
- Characteristics 215
- Specifying CHARACTER SIZE 216
- Telnet Keymapping Functions 217
- Specifying AUTOFLUSH 218
- Specifying AUTOSYNCH 218
- Specifying FLOW CONTROL 219
- Service Permissions Access 224
- Access Command Variables 226
- Specifying the Port USERNAME 228
- Defining the Break Key 230
- Specifying BROADCAST 231
- Specifying LOSS NOTIFICATION 232
- Specifying Message Codes 233
- Specifying VERIFICATION 233
- Specifying Lock 233
- Specifying User Groups 235
- Local> SET PORT GROUPS 5 236
- Local> 239
- CHANGE PORT 5 SESSION LIMIT 6 239
- Displaying Session Status 242
- Terminating Sessions 245
- Chapter 12 247
- Configuration Parameters 248
- Assigning a Service Name 249
- Enabling Announcements 249
- Assigning a Port Name 250
- Services 252
- Verifying the LAT Service 261
- Displaying Services Status 264
- Displaying Services Summary 266
- Chapter 13 269
- Sample Device Configurations 270
- Sample Configuration 273
- Procedure 277
- Configuring a Telnet Listener 279
- Specifying Character Size 281
- Displaying Telnet Listeners 283
- Removing a Telnet Listener 284
- Reassigning a Port 285
- When To Use Raw TCP 287
- Configuring Raw TCP 287
- Example: Raw TCP Display 288
- Chapter 14 289
- Configuring LPD Printers 289
- LPD Operation 290
- Configuring LPD Printers 14-3 291
- Configuring LPD 293
- Setting Port Characteristics 294
- Printer Configuration Example 295
- Chapter 15 297
- Changing the MTU 303
- Fragmentation 303
- Terminal or SLIP Host 304
- Prerequisites 307
- Establishing a SLIP Session 308
- Compressed SLIP 309
- Displaying SLIP Counters 310
- Disabling SLIP 311
- Chapter 16 313
- Configuring for SNMP Access 313
- Supported SNMP Features 314
- Supported MIBs 315
- Supported MIB Variables 315
- Enabling and Disabling SNMP 317
- Default Community Name PUBLIC 317
- Sample SNMP Configuration 320
- Removing Community Names 320
- Configuring the NMS 322
- Chapter 17 323
- Managing the Access Server 323
- Reducing Memory Usage 325
- Specifying the Prompt 332
- Displaying Port Counters 347
- Displaying Port Status 349
- Displaying Port Summary 351
- Chapter 18 353
- Emulation (TN3270) 353
- Supported ASCII Terminals 354
- 3278 Keyboards 355
- Server-Specific Keyboard Maps 355
- Setting Up an ASCII Terminal 356
- Terminal Setup Parameters 357
- IBM Host Communications 358
- Status Line Indicator Display 360
- Limiting NVRAM Usage 370
- TN3270 Port Characteristics 372
- SHOW Commands 373
- Chapter 19 375
- Protocol (PPP) Ports 375
- Using the CONNECT PPP Command 378
- ATCP Characteristics 384
- Displaying PPP Status 386
- Displaying IPCP Status 388
- Displaying ATCP Status 390
- Displaying PPP Counters 392
- Displaying IPCP Counters 394
- Displaying ATCP Counters 396
- Chapter 20 399
- Managing IPX 399
- IPX Description 400
- Managing IPX 20-3 401
- Getting Started 402
- Software Requirements 403
- Hardware Requirements 403
- Setting Up Your PC 404
- Enabling IPX 405
- 20-10 Managing IPX 408
- Local> CHANGE PORT 408
- LCP AUTHENTICATION DISABLE 408
- Port PPP IPX Commands for LCP 409
- 20-12 Managing IPX 410
- Server IPX Commands 411
- 20-14 Managing IPX 412
- Modem Considerations 413
- 20-16 Managing IPX 414
- Novell Operation 415
- 20-18 Managing IPX 416
- Verifying Configuration 417
- Disabling IPX 418
- Frame Types 419
- Using the SHOW command 420
- IPX Characteristics Display 420
- Managing IPX 20-23 421
- Displaying IPX Status 422
- Displaying IPX Counters 423
- 20-26 Managing IPX 424
- Managing IPX 20-27 425
- Displaying IPX Routes 426
- Resetting Counters 427
- Chapter 21 429
- Managing Dial Services 429
- Dial Services Command Groups 430
- Server Configuration Display 431
- Defining a Dialer Script 432
- 21-6 Managing Dial Services 434
- Defining the Dialer Service 437
- Showing Dialer Service Status 438
- Displaying Dialer Counters 440
- Modifying the Dialer Service 440
- Managing Dial Services 21-13 441
- 21-14 Managing Dial Services 442
- Framed Dial Requests 444
- Managing Dial Services 21-17 445
- Chapter 22 447
- Security Type Descriptions 448
- SecurID 449
- User Accounts 449
- Security Server 451
- UDP Ports 451
- Managing Kerberos 452
- User Authentication Procedure 456
- User Authentication Counters 457
- Managing RADIUS 459
- Optional Setup for RADIUS 460
- RADIUS User Authorizations 461
- Setting User Permissions 462
- Additional RADIUS Attributes 463
- Managing SecurID 469
- Minimal Setup for SecurID 470
- Optional Setup for SecurID 470
- SecurID User Authorizations 471
- Defining the Realm 473
- Example: Showing SecurID 475
- CHARACTERISTICS command: 475
- Displaying Security Summary 476
- Showing Security Counters 477
- AUTOLINK Authentication 478
- Setting AUTOLINK Timers 480
- Timeouts 481
- Using a Login Script 481
- Specifying Passwords 483
- Specifying PASSWORD LIMIT 484
- Chapter 23 7 487
- Accounting 487
- Accounting Description 488
- What Events Are Logged? 489
- Event Field Descriptions 490
- Accounting 23-5 491
- 23-6 Accounting 492
- Accounting 23-7 493
- 23-8 Accounting 494
- When Events Are Logged 495
- Password Modified Events 496
- Managing Accounting 497
- 23-12 Accounting 498
- Accounting 23-13 499
- Accounting Characteristics: 499
- Displaying the Accounting Log 500
- Appendix A 503
- Glossary-2 506
- /etc/bootptab 506
- Glossary-8 512
- Glossary-18 522
- Index-1 523
- Index-3 525
- Index-5 527
- Index-7 529
- Index-9 531
- Index-10 532
- Index-11 533
- Index-12 534
- Index-13 535
- Index-14 536
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