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Valorado. / 5. Basado en revisión del cliente
Troubleshooting a Network Connection Problem
6-13
1. Compare the endstation’s interface number, network number, and
subnet mask to those of the router’s interface. The network and subnet
numbers must be the same, except that the endstation’s subnet mask does
not have to include as many octets as the router’s (Figure 6-
1).
Figure 6-1. Comparing the Endstation and Router Configurations
The subnet mask allows the router to determine which traffic to route to each
segment. In Figure 6-
1, the router’s subnet mask must include the third octet if
other subnets in the 129.122 network connect to the router. Usually in such
configurations, you configure Proxy ARP (Address Resolution Protocol) to
run on the router’s interface because the endstation does not know that it has
to go through the router to get to other subnets of the 129.122.0.0 network.
2. Disable IP on the router’s interface, and try to ping the IP address of the
router again.
If the ping succeeds, a device with a duplicate IP address is on the segment.
3. Enable IP on the router’s interface and try to ping other stations on the
segment that is reporting problems.
Host
Router
Network 129.122.32.0
Interface 129.122.32.1
Subnet mask 255.255.255.0
Network 129.122.0.0
Interface 129.122.32.66
Subnet mask 255.255.0.0
- Troubleshooting Routers 1
- Bay Networks Software License 3
- Contents 5
- About This Guide 15
- CompuServe 16
- How to Get Help 17
- Conventions 18
- Acronyms 19
- Chapter 1 25
- Introduction 25
- Caution: 26
- Backing Up Your Files 27
- Preparing to Troubleshoot 28
- Filtering Event Messages 30
- <object> 38
- <volume> 41
- <attribute> 42
- Using Ping 44
- Using Packet Capture 45
- Documenting Each Step 47
- Chapter 2 49
- Chapter 3 53
- Damaged Router 54
- Power Problem 54
- Blown Fuse 54
- LEDs Not Lit 55
- Router Won’t Boot 55
- Checking the Boot PROMs 58
- Configuration File 58
- Example: 59
- Lost Password 62
- No Space Left on Memory Card 63
- Memory or Buffer Problem 64
- Bad Forward Checksum Errors 69
- Backplane BOFL 71
- Fault Message 72
- Chapter 4 73
- (continued) 75
- Chapter 5 79
- Dropped Frames 82
- ATM VC . . . Failed Message 82
- <slot> 87
- Troubleshooting Routers 100
- <slot_no.> 101
- <connector_no.> 101
- <setting> 101
- <instance> 103
- <ENTITY> 104
- Chapter 6 107
- Troubleshooting AppleTalk 108
- Troubleshooting DLSw 110
- Troubleshooting IP 112
- <TELNET 114
- Ping Does Not Work 115
- <slot_no.> 116
- Network Unreachable Message 117
- Host Did Not Respond Message 118
- Remote Station 120
- Troubleshooting IPX 122
- <destination_address> 125
- <service_name> 126
- Troubleshooting OSI 127
- Chapter 7 139
- Cannot Find File Message 140
- <community index> 144
- <IP address> 144
- <pathname> 147
- Chapter 8 149
- Getting Help 149
- <filename> 151
- Appendix A 153
- Reading the Event Log 153
- System Startup 154
- Dial-on-Demand Raise DTR Log 170
- Dial-on-Demand V.25bis 174
- Appendix B 189
- Run Packet Capture 189
- Implementation Notes 192
- Getting Started 192
- <slot_mask> 193
- Creating an Instance for MCT1 194
- 10902101 195
- Example 1 197
- Example 2 197
- <line_no.> 198
- <value> 198
- Enabling Packet Capture 199
- Starting Packet Capture 200
- Terminating Packet Capture 200
- <start> 201
- <count> 201
- Capture file: 203
- Using Optional Features 204
- Assigning Filters 207
- <attribute_no.> 208
- Specifying the Reference 210
- Specifying the Offset 211
- Configuration Examples 213
- Example 3 214
- Example 4 214
- Example 5 215
- <IP_address> 219
- <filename.> 219
- Displaying the File 221
- Examples: 222
- Basic Parameters 225
- <slot no.> 229
- Trigger Parameters 230
- Attribute Name 231
- Attribute 231
- MIB Object ID 231
- Filter Parameters 232
- Bisynchronous 238
- Frame Relay 238
- Passthru 239
- PTP (STANDARD) 240
- Token Ring 241
- (continued) 243
- Packet Size, B-11, B-41 250
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