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NOTE: You can enable packet capture and port mirroring simultaneously on a Services
Router.
For more information about traffic sampling, see the JUNOS Policy Framework
Configuration Guide.
This overview contains the following topics:
■ Packet Capture on Router Interfaces on page 255
■ Firewall Filters for Packet Capture on page 255
■ Packet Capture Files on page 256
■ Analysis of Packet Capture Files on page 256
Packet Capture on Router Interfaces
Packet capture is supported on the T1, T3, E1, E3, serial, Fast Ethernet, ADSL,
G.SHDSL, PPPoE, and ISDN interfaces.
To capture packets on an ISDN interface, configure packet capture on the dialer
interface. To capture packets on a PPPoE interface, configure packet capture on the
PPPoE logical interface.
Packet capture supports PPP, Cisco HDLC, Frame Relay, and other ATM
encapsulations. Packet capture also supports Multilink PPP (MLPPP), Multilink Frame
Relay end-to-end (MLFR), and Multilink Frame Relay UNI/NNI (MFR) encapsulations.
You can capture all IPv4 packets flowing on an interface in the inbound (ingress) or
outbound (egress) direction or in both directions. Tunnel interfaces can support
packet capture in the outbound direction only.
Use the J-Web configuration editor or CLI configuration editor to specify maximum
packet size, the filename to be used for storing the captured packets, maximum file
size, maximum number of packet capture files, and the file permissions. See
“Configuring Packet Capture on an Interface (Required)” on page 259.
NOTE: For packets captured on T1, T3, E1, E3, serial, and ISDN interfaces in the
outbound (egress) direction, the size of the packet captured might be 1 byte less than
the maximum packet size configured because of the packet loss priority (PLP) bit.
To modify encapsulation on an interface that has packet capture configured, you
must first disable packet capture. For more information, see “Changing Encapsulation
on Interfaces with Packet Capture Configured” on page 262.
Firewall Filters for Packet Capture
When you enable packet capture on a Services Router, all packets flowing in the
direction specified in packet capture configuration (inbound, outbound, or both) are
captured and stored. Configuring an interface to capture all packets might degrade
Packet Capture Overview ■ 255
Chapter 13: Configuring Packet Capture
- Administration Guide 1
- End User License Agreement 3
- Abbreviated Table of Contents 5
- Table of Contents ■ ix 9
- Table of Contents 10
- Table of Contents ■ xi 11
- Table of Contents ■ xiii 13
- Part 5 Index 14
- About This Guide 15
- How to Use This Guide 16
- Document Conventions 17
- Documentation Feedback 21
- Requesting Technical Support 21
- Administration 23
- Chapter 1 25
- User Authentication Overview 26
- User Authentication 26
- User Accounts 26
- Login Classes 27
- Template Accounts 29
- RADIUS Server 31
- TACACS+ Server 32
- Adding New Users 33
- 172.16.98.1 34
- Radiussecret1 34
- 10.0.0.1 34
- 172.16.98.24 35
- Tacacssecret1 35
- Controlling User Access 38
- Creating User Accounts 39
- Setting Up Template Accounts 40
- Recovering the Root Password 43
- Securing the Console Port 45
- Using the telnet Command 46
- Using the ssh Command 47
- Management 51
- USB Modem Overview 52
- USB Modem Interfaces 52
- On the Services Router 54
- At the User End 54
- Administering USB Modems 62
- L2 command 63
- Resetting USB Modems 64
- Configuring SNMP for Network 69
- Management Information Base 70
- SNMP Communities 70
- SNMP Traps 71
- Spoofing SNMP Traps 71
- SNMP Health Monitor 71
- Communities 73
- Health Monitoring 74
- Chapter 4 85
- DHCP Overview 86
- DHCP Options 87
- Interface Restrictions 87
- Boot Options 93
- DHCP Subnet Configuration 94
- Meaning Verify the following: 100
- Displaying DHCP Statistics 101
- Configuring Autoinstallation 103
- Autoinstallation Overview 104
- Before You Begin 106
- Verifying Autoinstallation 108
- Troubleshooting 111
- Enabling Commit Scripts 112
- Disabling Commit Scripts 113
- Operation Script Overview 114
- Enabling Operation Scripts 115
- Executing Operation Scripts 115
- Disabling Operation Scripts 116
- Event Policy Overview 117
- Configuring Event Policies 117
- Monitoring a Services Router 121
- Operations 123
- Monitoring Tools Overview 124
- 104 ■ Monitoring Overview 126
- Filtering Command Output 127
- Using the Monitoring Tools 129
- Monitoring System Properties 129
- ■ Using the Monitoring Tools 130
- commands 132
- Monitoring the Chassis 133
- Monitoring the Interfaces 135
- Monitoring Route Information 138
- OSPF Statistics 142
- RIP Statistics 142
- DLSw Circuits 144
- DLSw Peers 144
- Monitoring CoS Interfaces 145
- Monitoring CoS Classifiers 146
- Monitoring CoS Value Aliases 147
- Monitoring CoS Rewrite Rules 150
- Monitoring CoS Scheduler Maps 151
- Monitoring MPLS Interfaces 153
- Monitoring Service Sets 157
- Monitoring Firewalls 158
- I (input) or O (output) 161
- 100 in the Threshold box 161
- Monitoring IPSec Tunnels 162
- Monitoring NAT Pools 164
- Monitoring DHCP 165
- Monitoring RPM Probes 167
- Round-Trip Time for a Probe 168
- Monitoring PPP 169
- Monitoring PPPoE 170
- PPPoE Statistics 171
- DSP Capacity 175
- Log Files 177
- System Log Messages Overview 178
- Regular Expressions 180
- Archiving System Logs 183
- Disabling System Logs 184
- Filtering System Log Messages 184
- Viewing System Log Messages 186
- Chapter 9 187
- Alarm Overview 188
- Alarm Types 188
- Alarm Severity 189
- Alarm Conditions 189
- 168 ■ Alarm Overview 190
- 170 ■ Alarm Overview 192
- Alarm Overview ■ 171 193
- Checking Active Alarms 196
- Detailed Alarm Message 197
- ■ T3 alarms 198
- ■ DS1 alarms 198
- ■ Ethernet alarms 198
- ■ Serial alarms 198
- Chapter 10 201
- Upgrade Software Packages 202
- Recovery Software Packages 202
- /var/tmp/upgrade directory 204
- Downgrading the Software 207
- Configuring Boot Devices 208
- ■ Configuring Boot Devices 210
- Figure 17: Reboot Page 216
- DescriptionOption 217
- Managing Files 221
- Downloading Files 222
- Chapter 11: Managing Files 223
- Managing Accounting Files 224
- /config and 225
- Modifying the Encryption Key 227
- Problems 229
- Chapter 12 231
- Diagnostic Tools Overview 232
- Manage Options 233
- ■ Diagnostic Tools Overview 234
- MPLS Connection Checking 235
- General Preparation 237
- Ping MPLS Preparation 237
- Your ActionFunctionField 238
- Ping LDP-signaled LSP 242
- Ping MPLS Results and Output 244
- 127.0.0.1 245
- Figure 23: Traceroute Page 246
- Using J-Web Packet Capture 248
- Using CLI Diagnostic Commands 252
- Pinging Hosts from the CLI 252
- Pinging Layer 3 VPNs 256
- Pinging Layer 2 VPNs 257
- Pinging Layer 2 Circuits 258
- Using the traceroute Command 259
- Current delta column. The 267
- Delta column. The statistics 267
- Delta column 268
- DescriptionOperator 273
- Configuring Packet Capture 275
- Packet Capture Overview 276
- Packet Capture Overview ■ 255 277
- Packet Capture Files 278
- Disabling Packet Capture 283
- Deleting Packet Capture Files 283
- Verifying Packet Capture 285
- Verifying Captured Packets 286
- Configuring RPM Probes 289
- RPM Overview 290
- RPM Probes 290
- RPM Tests 291
- Probe and Test Intervals 291
- RPM Statistics 292
- RPM Thresholds and Traps 293
- RPM for BGP Monitoring 293
- Performance Probe Owners 294
- Identification 294
- Maximum Probe Thresholds 296
- Configuring Basic RPM Probes 298
- Tuning RPM Probes 304
- Verifying RPM Services 308
- Verifying RPM Statistics 308
- Verifying RPM Probe Servers 310
- Index on page 291 311
- 290 ■ Index 312
- Index ■ 291 313
- 292 ■ Index 314
- Index ■ 293 315
- 294 ■ Index 316
- Index ■ 295 317
- 296 ■ Index 318
- Index ■ 297 319
- 298 ■ Index 320
- Index ■ 299 321
- 300 ■ Index 322
- Index ■ 301 323
- 302 ■ Index 324
- Index ■ 303 325
- 304 ■ Index 326
- Index ■ 305 327
- 306 ■ Index 328
- Index ■ 307 329
- 308 ■ Index 330
- Index ■ 309 331
- 310 ■ Index 332
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