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Using DNS to Balance Work Load
6.2 Round-Robin Scheduling
TCPIP> SHOW HOST ROBIN
BIND database
Server: 9.20.208.72 owl.ucx.ern.sea.com
Host address Host name
9.20.208.47 robin.ucx.ern.sea.com
9.20.208.30 robin.ucx.ern.sea.com
9.20.208.72 robin.ucx.ern.sea.com
TCPIP> SHOW HOST ROBIN
BIND database
Server: 9.20.208.72 owl.ucx.ern.sea.com
Host address Host name
9.20.208.30 robin.ucx.ern.sea.com
9.20.208.72 robin.ucx.ern.sea.com
9.20.208.47 robin.ucx.ern.sea.com
TCPIP> SHOW HOST ROBIN
BIND database
Server: 9.20.208.72 owl.ucx.ern.sea.com
Host address Host name
9.20.208.72 robin.ucx.ern.sea.com
9.20.208.47 robin.ucx.ern.sea.com
9.20.208.30 robin.ucx.ern.sea.com
TCPIP> SHOW HOST ROBIN
BIND database
Server: 9.20.208.72 owl.ucx.ern.sea.com
Host address Host name
9.20.208.47 robin.ucx.ern.sea.com
9.20.208.30 robin.ucx.ern.sea.com
9.20.208.72 robin.ucx.ern.sea.com
6.2.1 Disabling Round-Robin Scheduling
If you want to disable round-robin scheduling, use the DCL command DEFINE to
define the following logical:
$ DEFINE/SYSTEM TCPIP$BIND_ROUND_ROBIN_OFF
6.3 Load Broker Concepts
TCP/IP Services provides a configurable, calculated, load-balancing mechanism
called the load broker for distributing the load across systems in a DNS cluster.
Unlike round-robin scheduling (the default method used by most DNS name
servers), the load broker takes into account the load on all DNS cluster
participants. The load broker polls DNS cluster members and updates the
DNS namespace accordingly.
Using DNS to Balance Work Load 6–3
- Compaq TCP/IP Services for 1
- Management 1
- Contents 3
- 4 Configuring Routing 4
- Part 2 BIND 4
- Part 3 Configuring Services 6
- 7 Configuring the DHCP Server 6
- 8 Configuring the DHCP Client 8
- 9 Configuring BOOTP 8
- 10 Configuring TFTP 9
- 11 Configuring the Portmapper 9
- 13 Configuring SNMP 10
- 16 Remote (R) Commands 11
- Part 5 Network File Services 13
- 20 NFS Server 13
- 21 NFS Client 14
- 24 Setting Up PC-NFS 15
- Part 7 Appendixes 15
- C How NFS Converts File Names 17
- D Acronyms 17
- Examples 17
- Intended Audience 21
- Document Structure 21
- Related Documents 22
- Reader’s Comments 24
- Conventions 24
- Monospace text 25
- Connecting to the Network 27
- Managing TCP/IP Services 29
- 1.1 Getting Started 30
- 1.1.1 Logical Names 30
- 1.1.3 Saving Changes 31
- DECnet-over-TCP/IP Support 33
- 1.5 Auxiliary Server 35
- 1.6 Enabling Services 37
- Configuring Interfaces 39
- Configuring Serial Lines 43
- 3.1 Key Concepts 44
- 3.1.4 Point-to-Point Protocol 45
- 3.3.6 Shutting Down SLIP 56
- 3.4.1 Solving PPP Problems 58
- Configuring Routing 59
- 4.1 Key Concepts 60
- 4.2 Configuring Static Routes 61
- 4.4 Configuring GATED 64
- 4.4.2 Enabling Forwarding 65
- 4.4.3 Extending Routing 66
- 4.4.4 Interface Routes 67
- 5.1 Key Concepts 72
- 5.2 Migrating to BIND 8.1 74
- 5.3.6 Dynamic Updates 90
- 5.4.4 Sample Database Files 97
- Configuring and Managing BIND 100
- 5.7.2 Examples 104
- 5.8.1 Invoking NSLOOKUP 107
- 5.8.2 Obtaining Help 108
- 5.8.3 NSLOOKUP Commands 108
- 5.8.4 Default Option Values 109
- 5.8.5 Query Types 113
- 5.9.1 Server Not Responding 118
- 5.9.2 Serial Number Mismatch 118
- 6.1 DNS Clusters 119
- 6.2 Round-Robin Scheduling 119
- 6.3 Load Broker Concepts 121
- 6.7.1 Metric View Utility 127
- Configuring Services 129
- Configuring the DHCP Server 131
- 7.1 Key Concepts 132
- 7.1.1 How DHCP Operates 132
- 7.2 DHCP Server Components 134
- 7.2.2 Configuration Files 135
- 7.2.3 Command Files 145
- 7.2.4 Logical Names 145
- 7.2.5 Log Files 147
- 7.5.1 General Information 154
- 7.7 Configuring DHCP Manually 180
- 7.8 Supporting Utilities 191
- Configuring the DHCP Client 197
- 8.1 Key Concepts 198
- 8.1.2 Requesting a Lease 199
- 8.1.3 Requesting Parameters 199
- 8.2 DHCP Client Components 200
- 8.2.2 Configuration Files 201
- 8.2.3 Command Files 207
- 8.2.4 System Logicals 207
- 8.2.5 Log Files 207
- 8.4.2 Configuring the Software 210
- 8.6 Using the SHOWDHC Utility 213
- Configuring BOOTP 215
- 9.1 Key Concepts 216
- 9.2.2 BOOTP Service Decisions 216
- 9.2.3 BOOTP Security 217
- 9.4.3 BOOTP Logical Names 219
- 9.5 Creating a BOOTP Database 220
- 9.5.2 Converting UNIX Records 221
- 9.6 Solving BOOTP Problems 222
- Configuring TFTP 225
- 10.3 TFTP Security 228
- 10.4 Solving TFTP Problems 228
- Configuring the Portmapper 231
- Configuring and Managing NTP 235
- 12.1 Key Concepts 236
- 12.3 Configuring Your NTP Host 238
- 12.6 NTP Event Logging 244
- 12.6.1 Sample NTP Log File 247
- 12.8 NTP Utilities 249
- 12.9 Solving NTP Problems 261
- Configuring SNMP 263
- 13.1 Key Concepts 264
- 13.4 Configuring SNMP 268
- 13.4.3 SNMP Options 271
- 13.5 SNMP Log Files 282
- 13.6 Solving SNMP Problems 283
- 14.1 Managing TELNET 295
- 14.2 Solving TELNET Problems 297
- Configuring and Managing FTP 301
- 15.1 Managing FTP 302
- 15.2 Solving FTP Problems 306
- Remote (R) Commands 309
- 16.3 Security Considerations 311
- 16.3.2 Case-Sensitivity Flag 312
- 16.5.2 Client Utilities 313
- 16.5.3 Client Examples 314
- Configuring and Managing SMTP 315
- 17.1 Key Concepts 316
- 17.1.5 How SMTP Routes Mail 318
- 17.2 Configuring SMTP 320
- 17.4 Managing SMTP 322
- 17.6 Configuring SMTP AntiSPAM 329
- 17.7.1 SFF Security Measures 341
- 17.7.3 Invoking SFF from DCL 341
- 17.9 Solving SMTP Problems 342
- 18.1 Key Concepts 345
- 18.1.1 POP Server Process 346
- -ERR access denied 353
- X-POP3-Server 354
- X-POP3-ID 354
- 18.4 Enabling MIME Mail 356
- 18.5 Solving POP Problems 356
- 19.1 Key Concepts 359
- 19.2 XDMCP Queries 360
- 19.3 XDM Configuration Files 360
- 19.3.2 XACCESS.TXT File 361
- 19.3.3 XSERVERS.TXT File 363
- 19.3.4 XDM_KEYS.TXT File 363
- 19.3.5 XDM_XSESSION.COM File 364
- 19.4 XDM Log Files 365
- Network File Services 367
- NFS Server 369
- 20.1 Key Concepts 370
- 20.1.1 Clients and Servers 370
- 20.4 Setting Up PC-NFS 376
- 20.6.1 Adding Proxy Entries 378
- 20.7 Backing Up a File System 379
- /usr/smith 382
- 20.14 File Locking 387
- NFS Client 391
- 21.1 Key Concepts 392
- 21.4.1 User-Level Mounting 398
- 21.4.2 Automounting 400
- 21.4.3 Background Mounting 400
- 21.4.4 Overmounting 401
- 21.4.5 Occluded Mounting 401
- Configuring Printing Services 403
- 22.1 Key Concepts 405
- 22.2 Configuring LPR/LPD 406
- 22.3 Configuring Printers 410
- 22.8 Solving LPD Problems 416
- 23.1 Key Concepts 417
- 23.3 Setting Up Print Queues 418
- 23.4 Setting Up Relay Queues 419
- 23.6.3 Stalled Print Queues 424
- Setting Up PC-NFS 427
- 24.4 PC-NFS Authentication 428
- Appendixes 429
- Configuration Reference 431
- A.3 Statement Grouping 432
- A.4 Configuration Statements 432
- A.6.1 Assigning Preferences 435
- A.7 Tracing Options 436
- A.7.1 Global Tracing Options 437
- A.7.2 Packet Tracing 438
- A.8 Directive Statements 439
- A.9 Options Statements 439
- A.10 Interface Statements 440
- A.10.1 Interface Lists 443
- A.11 Definition Statements 445
- A.12 Protocol Overview 446
- A.12.4 ICMP 447
- A.12.5 Redirect 447
- A.13 The ICMP Statement 448
- A.14 Redirect Processing 449
- A.16 The Kernel Statement 453
- A.16.7 Special Route Flags 457
- A.16.9 Kernel Tracing Options 459
- A.17 Static Routes Statements 460
- A.18 Control Statements 462
- A.18.2 Matching AS Paths 463
- A.18.3 The Import Statement 465
- A.18.4 The Export Statement 467
- A.18.5 Specifying the Source 470
- A.18.6 Route Aggregation 471
- A.20 For More Information 477
- (3F hexadecimal) 481
- How NFS Converts File Names 483
- Acronyms 487
- DHCPSIGTERM 494
- NSUPDATE 499
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