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BCM 4.0 Networking Configuration Guide
Chapter 69
Configuring DNS
BCM can function as a DNS proxy or a DNS client.
The following path indicates where to configure the DNS settings in Element Manager:
• Element Manager: Configuration > Data Services > DNS
Refer to the following:
• “DNS proxy”
• “DNS client”
DNS proxy
When BCM receives DNS requests from clients, it first checks its local cache for name entries and
records. If found locally, BCM immediately responds to clients. Otherwise, BCM creates a new
DNS request to the remote Primary or Secondary DNS servers on behalf of the client. If the remote
DNS server responds with the requested records, they are forwarded to clients and cached in BCM.
By caching the DNS requests, the DNS proxy service on BCM reduces the number of external
DNS requests and thus reduces the amount of WAN traffic.
The DNS proxy service also provides additional security. When DNS requests are sent to the
Primary or Secondary DNS servers, the BCM published IP address is used for the request. By
using the BCM IP address, the IP addresses of the internal users can remain hidden.
DNS client
If the DNS proxy is not enabled, then the BCM is configured as a DNS client through the Element
Manager. This can be done in two locations:
• Configuration > Data Services > DNS
• Configuration > Data Services > DHCP > Subnets > General Settings tab
If this option is enabled, the DNS IP address for DNS clients will be obtained from the DHCP
server. This will direct the DNS queries to another box, which has a DNS server.The DNS client
settings from DHCP will be overritten by DNS if DNS Proxy is enabled or Obtain settings from
DHCP is disabled.
Using the BCM DNS service
Consider the following guidelines when using DNS:
• If you enable the BCM DNS service, ensure that you configure each workstation on the
network to use BCM as DNS server, and that the primary and secondary DNS server IP
addressees are configured on the BCM. If the DNS server IP addresses are not set on the BCM,
then DNS proxy is not functional.
- Document Status: Standard 1
- Document Version: 01.04 1
- Part Number: N0060606 1
- Date: May 2009 1
- Trademarks 2
- Task List 3
- 10 Task List 10
- N0060606N0060606 10
- Contents 11
- Chapter 25 16
- Chapter 26 16
- Chapter 61 23
- Chapter 62 23
- Appendix C 27
- Appendix D 27
- 28 Contents 28
- Chapter 1 29
- Acronyms 30
- About BCM 31
- BCM features 32
- BCM applications 32
- Related publications 34
- System Programming 35
- Telephones and Peripherals 35
- Digital Mobility 35
- IP Telephony 35
- Call Pilot 35
- Contact Center 36
- Other Applications 36
- User Guides 36
- Other applications 38
- How to get Help 39
- Chapter 2 41
- DID system 42
- Basic telephony routing 43
- Private network parameters 45
- Keycode requirements 46
- Lines used for networking 46
- Toronto office 49
- New York office 49
- System dialing plans 50
- Routing for tandem networks 51
- Trunk Route Optimization 55
- Trunk Anti-tromboning 55
- ETSI Euro network services 57
- DPNSS 1 services 58
- DPNSS 1 capabilities 58
- DPNSS 1 features 59
- Three party service 60
- Making a conference call 60
- Using the diversion feature 61
- MORE and the star key (*) 62
- Intrusion levels 63
- Call Offer 63
- Call Offer Displays 63
- User actions 64
- Figure 11 DPNSS networking 66
- Chapter 3 67
- Incoming calls 70
- Outgoing calls 74
- Chapter 4 77
- Total Resources 78
- Reserved Resources 79
- Table 10 Total Resources 80
- Details for application 81
- Chapter 5 83
- Signaling channels 84
- Media channels 84
- DSP resources 84
- Voice bus paths 84
- Signaling channel rules 85
- Media channel rules 85
- DSP resources rules 86
- Voice bus path 87
- ISDN WAN (Dial-up/Nailed-up) 88
- Voice mail and CC 88
- IVR and IVR Fax 89
- IP Trunks 90
- Record of required resources 93
- Evaluation 94
- Changing the DS30 split 98
- Chapter 6 101
- Media bay module Bus numbers 103
- Identifying the module 103
- These fields must agree 105
- Module types and capacities 106
- 4 lines per module 107
- Ports on Bus 108
- Timing within networks 111
- Interface levels 112
- Internal CSU 113
- Figure 27 E1 Parameters 114
- Figure 28 Translation Mode 115
- Provisioning a line 116
- To provision a line 116
- Internally-driven channels 117
- Working with the modules 118
- Chapter 7 119
- Trunk Port Details record 120
- Chapter 8 121
- Telephony Resources table 122
- Media bay module panels 124
- 460, or 126
- Port details 130
- IP telephones 133
- IP telephone set details 135
- Voice over IP trunks 136
- Figure 38 Routing Table 137
- IP Trunk Settings 138
- Table 33 IP Trunk Settings 139
- H323 Settings 140
- H323 Media Parameters 143
- SIP Settings 145
- SIP Media Parameters 147
- SIP URI Map 149
- Chapter 9 151
- Keycodes 152
- Local gateway programming 153
- Routing Table 154
- PSTN call to remote node 155
- Call process 156
- Describing a fallback network 157
- How fallback routing works 158
- Gatekeeper call scenarios 161
- Chapter 10 165
- Trunk/Line data - main panel 166
- Parameters 168
- Properties 169
- Preferences (lines) 171
- Assigned DNs 175
- Figure 55 Add a DN record 176
- Chapter 11 177
- Configuring PRI line features 179
- Chapter 12 183
- Chapter 13 187
- Chapter 14 193
- Chapter 15 199
- Chapter 16 205
- Configuring DID line features 208
- Chapter 17 211
- • Trunk type: DASS2 213
- Chapter 18 217
- • Trunk type: DPNSS 219
- Chapter 19 223
- Configuring BRI lines 225
- Chapter 20 229
- DN records: ISDN devices 230
- Prerequisites 231
- Chapter 21 233
- Figure 76 Loops table 234
- Table 46 Loops main panel 234
- T-loop general settings 235
- T-loop SPIDS and network DNs 235
- T-loops D-packet service 237
- S-loops assigned DNs 238
- Table 50 Loop settings 239
- Chapter 22 241
- Business name display 242
- Name display 243
- Chapter 23 247
- Programming incoming CLID 249
- Programming outgoing CLID 250
- Chapter 24 253
- 254 Chapter 24 Dialing plans 254
- Chapter 24 Dialing plans 255 255
- 256 Chapter 24 Dialing plans 256
- Private network dialing 257
- Outgoing call routing 258
- Outgoing public calls routing 259
- Incoming call routing 260
- Processing incoming calls 261
- 262 Chapter 24 Dialing plans 262
- Chapter 24 Dialing plans 263 263
- Extension 2246 264
- Extension 2280 264
- Understanding access codes 265
- Call Park codes 266
- Creating Direct Dial sets 267
- Tips about access codes 268
- Line pool access codes 269
- Using Carrier codes 270
- Configuring call routing 270
- Routing configuration 271
- Supporting protocols 271
- Call-by-Call services 272
- Chapter 24 Dialing plans 273 273
- Call by Call service routing 274
- Using destination codes 275
- Why use destination codes? 276
- Deciding on a code 277
- Configuring Absorbed length 278
- Chapter 24 Dialing plans 279 279
- 280 Chapter 24 Dialing plans 280
- Chapter 24 Dialing plans 281 281
- 282 Chapter 24 Dialing plans 282
- Figure 90 Routing workflow 284
- National access code 61 293
- Special access code 9 293
- Figure 97 Routes tab 296
- Destination codes 298
- Second Dial Tone 301
- Figure 100 Second Dial Tone 302
- Table 4 Second Dial Tone 302
- Chapter 27 303
- Line pool access code notes: 304
- Line pools: DNs tab 305
- Table 56 306
- Chapter 28 309
- DN length constraints 312
- Received number notes 313
- Chapter 29 317
- Public Network Settings 318
- Public network DN lengths 319
- Modifying a DN prefix 320
- Carrier Codes 321
- To add a carrier code 322
- To modify a carrier code 322
- To delete a carrier code 322
- Chapter 30 323
- Private Network Settings 324
- Chapter 31 329
- Public network: DID system 330
- Chapter 32 333
- Callers using BCM 334
- Callers in the public network 334
- Chapter 33 335
- Software requirements 336
- Message Waiting Indication 337
- Break-in 339
- MCDN networking checklist 340
- UDP-specific programming 342
- CDP-specific programming 342
- Meridian TRO programming 344
- West End office: 347
- East End office: 348
- WarehouseHead Office 349
- Networking with ETSI QSIG 350
- Chapter 34 353
- Dialout: 5234 6334 7434 354
- Chapter 35 355
- Remote access to the network 356
- Types of private networks 356
- Chapter 36 359
- Chapter 37 363
- Using VoIP to tandem systems 367
- To set up a network of BCMs 368
- Chapter 38 371
- Using the Redirection feature 372
- Call offer 373
- Route optimization 374
- Loop avoidance 374
- Private networking with DPNSS 374
- Figure 124 DPNSS networking 376
- Chapter 39 379
- Parameter Setting 381
- Chapter 40 383
- New York: Public network 385
- Chapter 41 387
- Chapter 42 391
- Meridian system as host 392
- System set up for host system 392
- To configure the host system 393
- Line Access tab 395
- Fwd No Answer field 395
- Chapter 43 397
- Telephones 398
- Gatekeepers 398
- SIP Proxy 398
- IP Network 398
- Key VoIP concepts 399
- 400 Chapter 43 VoIP overview 400
- Chapter 44 401
- Chapter 45 415
- Setting up the local gateway 416
- Setting up remote gateways 418
- To configure a remote gateway 419
- Configuring VoIP lines 420
- Chapter 46 423
- CS 1000 configuration 424
- Chapter 47 425
- To enable a T.38 fax 426
- Media gateways 426
- T.38 Fax restrictions 427
- 428 Chapter 47 T.38 fax 428
- Chapter 48 429
- To add the VoIP route 430
- To assign a VoIP line pool 431
- Examples: 432
- To deactivate a schedule 434
- Chapter 49 439
- Chapter 50 441
- Table 97 RTP over UDP 442
- UDP Port Ranges 443
- Signaling Port Ranges 444
- Chapter 51 445
- 446 Chapter 51 Media Gateways 446
- Chapter 52 447
- Default filters (other) 449
- Restriction filter examples 450
- Remote call-in programming 451
- Remote access line settings 452
- Remote access on DPNSS lines 453
- Defining CoS passwords 454
- External access tones 455
- Chapter 53 457
- Remote access on PRI 460
- Other programming 461
- Chapter 54 463
- To add a restriction filter 465
- Default filters 466
- Filter Heading Sub-heading 467
- 03 Lines Line restriction 467
- 04 Lines Remote restriction 467
- Chapter 55 469
- Chapter 56 473
- Programming references: 474
- Notes about CoS passwords 475
- CoS examples 476
- Chapter 57 479
- Chapter 58 481
- Network devices 482
- Network assessment 483
- Resource assessment 483
- Figure 146 Global settings 486
- VoIP trunks 490
- IP telephone records 490
- (N0060634) 491
- Prerequisites Yes No 491
- Chapter 59 493
- Network Interfaces panel 494
- Configuring LAN resources 495
- IP Settings 497
- 6 Click OK 498
- Additional IP Addresses 500
- Chapter 60 503
- Point-to-Point Protocol (PPP) 504
- WAN data compression 504
- Viewing WAN resources 505
- WAN Interface Properties 507
- WAN IP Address 508
- Setting WAN T1 Parameters 508
- To set WAN T1 parameters 508
- Table 13 WAN T1 parameters 509
- Setting WAN Sync Parameters 510
- To set WAN Sync Parameters 510
- Attribute Value Description 511
- Clock mode DTE 511
- Choose the clock mode 511
- PVC Configuration 513
- To add PVC congestion control 515
- To modify a PVC setting 516
- WAN PPP Parameters 516
- Multilink PPP Parameters 519
- To delete an IP address 523
- 526 Chapter 61 Data modules 526
- Chapter 61 Data modules 527 527
- To configure the DDI Mux 528
- Assigning the DDI Mux modules 528
- Assigning the line 529
- Removing a line assignment 530
- To remove a line assignment 530
- Chapter 61 Data modules 531 531
- Configuring a data module 532
- To delete a line assignment 533
- Line assignment 534
- Line pool access 535
- 536 Chapter 61 Data modules 536
- Dial-out for WANBackup 538
- Dial-out for SNMP traps 538
- Modem Dial-in 541
- Changing the Modem Region 542
- To change the Modem Region 542
- ISDN Dial-in 542
- Dial-out 543
- Configuring a modem interface 544
- Link Parameters 545
- Figure 168 Link Parameters 546
- IP Address Specification 547
- Access Parameters 548
- ISDN Dial-out 549
- Configuring an ISDN interface 550
- ISDN Channel Characteristics 551
- ISDN Link Parameters 552
- ISDN Access Parameters 553
- Characteristics table 555
- To delete an ISDN interface 555
- Settings required for PPPoE 556
- Configuring a PPPoE interface 557
- IP Address Specifications 559
- DNS Settings 560
- Deleting a PPPoE interface 562
- To delete a PPPoE interface 562
- Auto dial-out 563
- Create a dial-up interface 565
- Add the SNMP Trap destination 566
- Chapter 63 567
- Chapter 64 573
- Figure 182 Static Routes 574
- To delete a static route 575
- Figure 184 RIP parameters 581
- Figure 185 OSPF parameters 584
- OSPF NBMA Neighbors 586
- To add OSPF NBMA Neighbors 586
- To delete OSPF NBMA Neighbors 586
- Restarting the router 587
- Chapter 65 589
- Configuring the DHCP Mode 590
- Configuring a DHCP Server 590
- Figure 188 Subnets 591
- Table 141 Subnets 591
- LAN settings for DHCP Server 593
- Example: 594
- To add an address range 595
- To modify an address range 596
- To delete an address range 597
- To add a reserved address 597
- Modifying a reserved address 598
- Deleting a reserved address 599
- Viewing the Lease Information 599
- Remote Scope 600
- Attribute Definition 601
- To view the Lease information 604
- DHCP Server list 606
- Chapter 66 613
- Enabling and disabling NAT 614
- To select Default rules 615
- Adding a Rule to an interface 616
- Assigning filters to accounts 620
- Chapter 67 623
- To enable default rules 624
- To enable IP filters 625
- DSCP Marking 626
- Inbound Rules 627
- Adding an Inbound filter rule 628
- To add an inbound filter 628
- To modify an inbound filter 629
- To delete an inbound filter 629
- Outbound Rules 634
- DiffServ components 636
- IP service classes 636
- Table 155 Service classes 637
- To add an outbound filter 644
- To modify an outbound filter 644
- To delete an outbound filter 644
- Chapter 68 649
- DNS Server 650
- Encryption 652
- Encryption method 653
- Authentication method 653
- IPSec capacity restrictions 654
- Table 161 Rule 1 655
- Table 162 Rule 2 655
- Table 163 Rule 3 656
- Example of Rules 657
- Example 2 659
- IPSec Version 663
- IPSec Service 663
- Branch Office IPSec Tunnel 664
- Configuring the first BCM 673
- Configuring the second BCM 674
- Split Tunneling 675
- Static IP Address 677
- Remote User Tunnels 678
- To add a remote user tunnel 678
- Split Tunnel Networks 682
- To add a split tunnel network 682
- IP Address Pool 684
- To add an IP address pool 684
- To modify an IP address pool 685
- To delete an IP address pool 686
- Chapter 69 687
- Filter Rules” on page 623 690
- Chapter 70 691
- Chapter 71 695
- To modify Queue Settings 697
- QoS accounts 699
- Chapter 72 701
- 702 Chapter 72 VLAN overview 702
- Appendix A 703
- Fred here 706
- Comfort noise 707
- Appendix B 709
- Types of ISDN service 710
- ISDN layers 710
- ISDN bearer capability 711
- PRI services and features 711
- BRI services and features 712
- Service provider features 712
- Network name display 713
- Emergency 911 dialing 714
- ISDN hardware 715
- BRI hardware 716
- S Reference Point 716
- T Reference Points 716
- Clock source for ISDN 717
- ISDN BRI NT1 equipment 717
- ISDN standards compatibility 718
- Planning your ISDN network 718
- Ordering ISDN PRI 718
- Ordering ISDN BRI 718
- Appendix B ISDN overview 719 719
- Supported ISDN protocols 720
- RTP over IP (Sheet 2 of 2) 722
- Stateful session creation 725
- Example 1: ICMP 726
- Example 3: UDP and SIP 728
- Numerics 731
- 758 Index 758
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