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Configuring Address Resolution
117356-B Rev. 00
5-9
Enabling Proxy ARP on an Interface
Proxy ARP allows a router to answer a local ARP request for a remote
destination. For example, in Figure 5-2, hosts B and C are located on the same
network but on separate subnetworks. Hosts B and C do not understand
subnetworking. The router connecting the two physical networks knows which
host resides on which network. The address mask is 255.255.255.000. In this
example, one subnet is a remote network with respect to the other subnet.
Figure 5-2. Proxy ARP Example
Host B wants to talk to host C, so host B broadcasts an ARP request, which asks
IP address 140.250.250.3 to respond with its physical address. The router captures
host B’s ARP request and responds with its hardware address 00 002 00 00 01 and
host C’s IP address 140.250.250.3. Host B maps host C’s IP address
140.250.250.3 to the router’s hardware address 00 002 00 00 01.
140.250.250.0140.250.200.0
140.250.250.2140.250.200.2
140.250.200.1
00 002 00 00 01
140.250.200.1
00 002 00 00 01
140.250.250.3140.250.250.3
00 002 00 10 600 002 00 10 30
Router
Host
C
Host
A
Host
A
Host
B
IP0011A
- Configuring IP Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117356-B Rev. 00 10
- About This Guide 21
- Before You Begin 22
- Conventions 22
- Bay Networks Customer Service 25
- How to Get Help 25
- Chapter 1 27
- IP Addresses 28
- Subnet Addressing 30
- Supernet Addressing 33
- Autonomous S 34
- Information Protocol (RIP) 35
- Border Gateway Protocol (BGP) 36
- Router Discovery Protocol 37
- Route Preferences 38
- Route Weights 39
- Figure 1-3. IP Routing Table 41
- IP Traffic Filters 44
- RFC Compliance 44
- Chapter 2 47
- Starting IP 48
- Starting RIP 49
- Starting OSPF 50
- Starting BGP 51
- Starting Router Discovery 52
- Chapter 3 53
- Deleting IP from an Interface 55
- Customizing IP 55
- Adding RIP to an IP Interface 57
- Customizing RIP 58
- Customizing OSPF 60
- Deleting BGP from the Router 62
- Customizing BGP 63
- Starting EGP 64
- Deleting EGP from the Router 65
- Customizing EGP 65
- Starting NAT 66
- Chapter 4 75
- The IP global prompt appears 77
- Caution: 98
- Customizing an IP Interface 99
- Customizing IP Services 101
- Using the BCC 105
- Using Site Manager 105
- Configuring an SMDS Address 120
- is one of the following: 125
- Defining an Adjacent Host 126
- Defining a Static Route 128
- Defining a Default Route 129
- Choosing a Broadcast Type 132
- Chapter 5 135
- ARP Overview 136
- Figure 5-2. Proxy ARP Example 143
- Chapter 6 147
- Customizing RIP Services 147
- Setting the RIP Diameter 148
- Customizing a RIP Interface 150
- Selecting the RIP Version 154
- Specifying the Update Mode 157
- Sending Triggered Updates 158
- Listening for a Default Route 167
- Defining a RIP Accept Policy 176
- Chapter 7 189
- Customizing OSPF Services 189
- OSPF Concepts and Terminology 190
- OSPF Neighbors 191
- Neighbor Adjacencies 192
- Designated Routers 192
- OSPF Areas 193
- OSPF Router Types 194
- AS External Routes 194
- OSPF Implementation Notes 195
- OSPF interfaces 196
- For example: 197
- Supplying an OSPF ID 199
- Figure 7-2. OSPF ASE Routes 204
- (default) 208
- Setting the Holddown Timer 209
- Configuring Message Logging 210
- Enabling and Disabling OSPF 215
- Configuring an Area ID 216
- Specifying the Network Type 217
- Estimating the Transit Delay 223
- Setting the Hello Interval 225
- Setting the Dead Interval 227
- Specifying the Metric Cost 230
- Specifying the MTU Size 233
- Defining an Area 235
- Modifying an Area ID 237
- Configuring Authentication 237
- Configuring a Summary Route 239
- Configuring a Stub Area 240
- Chapter 8 261
- Configuring BGP Services 261
- BGP Concepts and Terminology 262
- Peer-to-Peer Sessions 263
- Interior BGP Routing 264
- IBGP Route Server 265
- Figure 8-3. IBGP Route Server 266
- BGP Updates 272
- BGP Implementation Notes 275
- Configuring BGP on the Router 276
- Enabling and Disabling BGP 277
- Supplying a BGP Identifier 279
- Identifying the Local AS 280
- Enabling Multihop Connections 285
- Configuring BGP as a Soloist 288
- Negotiating the BGP Version 300
- Keeping the Connection Alive 302
- Specifying a Holddown Time 306
- Setting the Route Echo Switch 313
- Defining a BGP Accept Policy 323
- Using Site Manage 329
- OSPF/BGP Interaction 343
- Chapter 9 345
- Customizing EGP Services 345
- EGP Concepts and Terminology 346
- EGP Implementation Notes 349
- Customizing EGP on the Router 350
- Supplying a Local AS Number 351
- Configuring a Neighbor 352
- Specifying the Gateway Mode 354
- Choosing the Acquisition Mode 356
- Choosing the Poll Mode 357
- Setting Neighbor Timers 358
- Chapter 10 359
- Security Label Format 360
- Inbound IP Datagrams 362
- Forwarded IP Datagrams 362
- Originated IP Datagrams 363
- Unlabeled IP Datagrams 363
- Enabling and Disabling RIPSO 364
- Datagrams 372
- RIPSO Example 374
- Figure 10-2. RIPSO Example 375
- Chapter 11 377
- BFE Addressing 379
- (continued) 385
- Parameter Required Setting 385
- Chapter 12 387
- Dynamic Mapping 388
- 10.0.0.15 (Figure 12-2) 391
- Static Mapping 393
- Enabling and Disabling NAT 394
- Configuring the Log Mask 397
- Table 12-2. Log Message Types 398
- Customizing a NAT Interface 401
- Modifying the Interface Type 402
- Configuring Static Mapping 403
- Adding a Local Address Range 405
- Adding a Global Address Range 408
- Appendix A 411
- Site Manager Parameters 411
- BGP Global Parameters 412
- BGP-3 Global Parameters 416
- BGP-4 Global Parameters 416
- BGP Peer Parameters 417
- BGP Event Message Parameters 427
- EGP Global Parameters 428
- EGP Neighbor Parameters 429
- IP Parameters 432
- IP Interface Parameters 434
- IP Global Parameters 448
- Static Route Parameters 455
- Adjacent Host Parameters 459
- RIPSO Parameters 461
- Router Discovery Parameters 470
- OSPF Parameters 472
- OSPF Interface Parameters 478
- OSPF Area Parameters 486
- Area Range Parameters 489
- RIP Parameters 494
- NAT Parameters 501
- Appendix B 505
- Routing Policies 505
- IP Announce Policy Parameters 524
- Appendix C 557
- RIP Export Filters 561
- OSPF Import Filters 564
- OSPF Export Filters 565
- BGP-3 Import Filters 568
- BGP-3 Export Filters 573
- EGP Import Filters 577
- EGP Export Filters 579
- Appendix D 585
- Route Weight Worksheet 585
- Appendix E 589
- IP/OSPF Configuration 589
- Index-10 606
- Index-11 607
- Index-12 608
- Index-13 609
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