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Denial of Service Commands 139
Denial of Service Commands
dos-control firstfrag
Use the
dos-control firstfrag
command in Global Configuration mode to enable Minimum TCP
Header Size Denial of Service protection. If the mode is enabled, Denial of Service prevention is
active for this type of attack. If packets ingress having a TCP Header Size smaller than the
configured value, the packets are dropped.
Syntax
dos-control firstfrag [
size
]
no dos-control firstfrag
•
size
—TCP header size. (Range: 0-255). The default TCP header size is 20. ICMP packet
size is 512.
Default Configuration
Denial of Service is disabled.
Command Mode
Global Configuration mode
User Guidelines
This command has no user guidelines.
Example
The following example defines a minimum TCP header size of 20. Packets entering with a
smaller header size are dropped.
console(config)#dos-control firstfrag 20
- CLI Reference Guide 1
- Notes, Notices, and Cautions 2
- Contents 3
- 2 Using the CLI 5
- 3 Layer 2 Commands 5
- 4 Management ACL Commands 5
- 5 User Interface Commands 5
- 6 AAA Commands 6
- 7 Address Table Commands 6
- 8 Clock Commands 7
- 9 Denial of Service Commands 8
- 10 DHCP Filtering Commands 8
- 12 GVRP Commands 9
- 13 IGMP Snooping Commands 9
- 15 LACP Commands 10
- 16 Link Dependency Commands 11
- 17 LLDP Commands 11
- 19 Port Monitor Commands 12
- 20 PHY Diagnostics Commands 12
- 21 System Management Commands 12
- 22 ACL Commands 14
- 23 Line Commands 14
- 24 IP Addressing Commands 14
- 25 802.1x Commands 15
- 27 QoS Commands 17
- 28 Radius Commands 18
- 29 RMON Commands 19
- 30 SNMP Commands 19
- 31 Port Channel Commands 20
- 32 Spanning Tree Commands 21
- 33 SSH Commands 22
- 34 Syslog Commands 22
- 35 TACACS+ Commands 23
- 36 Telnet Server Commands 23
- 37 VLAN Commands 23
- 38 Web Server Commands 25
- 39 Layer 3 Commands 25
- 40 ARP Commands 25
- 42 DHCPv6 Commands 26
- 43 DVMRP Commands 27
- 44 IGMP Commands 27
- 45 IGMP Proxy Commands 28
- 46 IP Routing Commands 28
- 47 IPv6 Routing Commands 29
- 49 Multicast Commands 30
- 50 OSPF Commands 31
- 51 OSPFv3 Commands 33
- 52 PIM-DM Commands 35
- 53 PIM-SM Commands 35
- 56 Tunnel Interface Commands 37
- Command Groups 39
- 2 Command Groups 40
- Mode Types 42
- Password Management 51
- 18 Command Groups 56
- 20 Command Groups 58
- 40 Command Groups 78
- 46 Command Groups 84
- History Buffer 88
- Negating Commands 88
- Show Command 88
- Command Completion 88
- Short Form Commands 89
- Keyboard Shortcuts 89
- Command Scripting 90
- CLI Command Modes 91
- User EXEC Mode 92
- Privileged EXEC Mode 93
- Global Configuration Mode 93
- Using the CLI 57 95
- Navigating CLI Command Modes 96
- Starting the CLI 101
- Using the CLI 102
- Using the CLI 65 103
- 66 Using the CLI 104
- Example Session 105
- Using the CLI 69 107
- Using CLI Functions and Tools 108
- Management Interface Security 109
- User Accounts Management 110
- User Access Control 111
- Management ACAL 112
- Terminal Paging 113
- Boot Message 113
- Boot Utility Menu 114
- Using the CLI 77 115
- FRU Utility Menu 116
- Using the CLI 79 117
- Monitoring Traps from CLI 118
- Layer 2 Commands 119
- 84 Layer 2 Commands 120
- Management ACL Commands 121
- Default Configuration 123
- Command Mode 123
- User Guidelines 123
- Examples 123
- Management ACL Commands 89 125
- User Interface Commands 127
- 96 User Interface Commands 130
- AAA Commands 131
- (Line Configuration) 137
- (User EXEC) 138
- AAA Commands 105 139
- 108 AAA Commands 142
- Address Table Commands 143
- Address Table Commands 113 147
- Address Table Commands 115 149
- Address Table Commands 117 151
- Address Table Commands 119 153
- Address Table Commands 121 155
- 124 Address Table Commands 158
- Clock Commands 159
- Clock Commands 127 161
- Clock Commands 129 163
- Clock Commands 131 165
- Clock Commands 133 167
- Clock Commands 135 169
- 136 Clock Commands 170
- Offset is 60 minutes 170
- Denial of Service Commands 171
- DHCP Filtering Commands 177
- 1/g6 yes 179
- 148 DHCP Filtering Commands 180
- Command Modes 188
- Example 189
- GVRP Commands 203
- GVRP Commands 175 205
- GVRP Commands 177 207
- GVRP Commands 181 211
- 182 GVRP Commands 212
- IGMP Snooping Commands 213
- IGMP Snooping Commands 185 215
- IGMP Snooping Commands 189 219
- LACP Commands 229
- LACP Commands 203 231
- 206 LACP Commands 234
- Link Dependency Commands 235
- Link Dependency Commands 209 237
- Link Dependency Commands 211 239
- 214 Link Dependency Commands 242
- LLDP Commands 243
- LLDP Commands 217 245
- LLDP Commands 219 247
- LLDP Commands 221 249
- Parameter Description 256
- Password Management Commands 257
- Port Monitor Commands 261
- 238 Port Monitor Commands 262
- 240 Port Monitor Commands 264
- PHY Diagnostics Commands 265
- System Management Commands 269
- Field Description 287
- Keywords Table 300
- Port Table 301
- ACL Commands 305
- Line Commands 313
- Line Commands 297 315
- 300 Line Commands 318
- IP Addressing Commands 319
- IP Addressing Commands 303 321
- IP Addressing Commands 305 323
- IP Addressing Commands 307 325
- IP Addressing Commands 309 327
- 802.1x Commands 331
- 802.1x Commands 317 333
- 802.1x Commands 319 335
- 802.1x Commands 321 337
- 802.1 Advanced Features 344
- 802.1x Commands 329 345
- 802.1x Commands 331 347
- Syntax Description 361
- QoS Commands 365
- QoS Commands 355 367
- QoS Commands 357 369
- QoS Commands 359 371
- QoS Commands 361 373
- QoS Commands 365 377
- QoS Commands 367 379
- QoS Commands 369 381
- QoS Commands 371 383
- QoS Commands 373 385
- QoS Commands 375 387
- QoS Commands 379 391
- QoS Commands 383 395
- 1/g1 in Down DELL 396
- QoS Commands 387 399
- 390 QoS Commands 402
- Radius Commands 403
- Radius Commands 395 405
- Radius Commands 397 407
- Radius Commands 399 409
- RMON Commands 413
- RMON Commands 409 417
- RMON Commands 411 419
- OID Monitored variable OID 419
- 420 RMON Commands 428
- SNMP Commands 429
- SNMP Commands 423 431
- SNMP Commands 425 433
- SNMP Commands 431 439
- SNMP Commands 437 445
- Port Channel Commands 449
- Port Channel Commands 443 451
- Port Channel Commands 447 455
- 448 Port Channel Commands 456
- Spanning Tree Commands 457
- Spanning Tree Commands 451 459
- Spanning Tree Commands 453 461
- 456 Spanning Tree Commands 464
- 458 Spanning Tree Commands 466
- 460 Spanning Tree Commands 468
- 462 Spanning Tree Commands 470
- Spanning Tree Commands 465 473
- Spanning Tree Commands 467 475
- Spanning Tree Commands 469 477
- Spanning Tree Commands 471 479
- Spanning Tree Commands 473 481
- 476 Spanning Tree Commands 484
- SSH Commands 485
- SSH Commands 483 489
- 488 SSH Commands 494
- Syslog Commands 495
- Syslog Commands 491 497
- Syslog Commands 493 499
- Syslog Commands 495 501
- Syslog Commands 497 503
- TACACS+ Commands 507
- TACACS+ Commands 505 509
- TACACS+ Commands 507 511
- 508 TACACS+ Commands 512
- Telnet Server Commands 513
- VLAN Commands 515
- VLAN Commands 513 517
- VLAN Commands 515 519
- VLAN Commands 517 521
- 520 VLAN Commands 524
- VLAN Commands 525 529
- VLAN Commands 529 533
- VLAN Commands 531 535
- VLAN Commands 533 537
- VLAN Commands 535 539
- 538 VLAN Commands 542
- Web Server Commands 543
- Web Server Commands 543 545
- Web Server Commands 547 549
- Web Server Commands 549 551
- Default configuration 553
- Layer 3 Commands 557
- 558 Layer 3 Commands 558
- ARP Commands 559
- ARP Commands 561 561
- ARP Commands 563 563
- ARP Commands 565 565
- 566 ARP Commands 566
- DHCP and BOOTP Relay Commands 567
- DHCPv6 Commands 573
- DHCPv6 Commands 575 575
- DHCPv6 Commands 577 577
- DHCPv6 Commands 579 579
- DHCPv6 Commands 581 581
- DHCPv6 Commands 583 583
- DVMRP Commands 585
- DVMRP Commands 591 589
- IGMP Commands 591
- IGMP Commands 597 593
- IGMP Commands 599 595
- IGMP Commands 601 597
- Default Value 601
- Usage Guidelines 601
- 606 IGMP Commands 602
- IGMP Proxy Commands 603
- IP Routing Commands 609
- IP Routing Commands 615 611
- IP Routing Commands 617 613
- IP Routing Commands 619 615
- IP Routing Commands 621 617
- IP Routing Commands 627 623
- 628 IP Routing Commands 624
- IPv6 Routing Commands 625
- IPv6 Routing Commands 631 627
- IPv6 Routing Commands 633 629
- IPv6 Routing Commands 635 631
- IPv6 Routing Commands 637 633
- IPv6 Routing Commands 639 635
- IPv6 Routing Commands 641 637
- IPv6 Routing Commands 643 639
- FE80::202:BCFF:FE00:3068/128 639
- IPv6 Routing Commands 645 641
- IPv6 Routing Commands 647 643
- 654 IPv6 Routing Commands 650
- Loopback Interface Commands 651
- Multicast Commands 653
- Multicast Commands 661 655
- Multicast Commands 663 657
- Multicast Commands 665 659
- Interface TTL 661
- --------- 661
- 674 Multicast Commands 668
- OSPF Commands 669
- OSPF Commands 677 671
- OSPF Commands 679 673
- OSPF Commands 681 675
- OSPF Commands 683 677
- OSPF Commands 685 679
- OSPF Commands 687 681
- OSPF Commands 689 683
- OSPF Commands 691 685
- OSPF Commands 693 687
- OSPF Commands 695 689
- OSPF Commands 699 693
- OSPF Commands 701 695
- OSPF Commands 703 697
- OSPF Commands 707 701
- OSPF Commands 711 705
- OSPF Commands 713 707
- OSPF Commands 715 709
- 1583compatibility 710
- 718 OSPF Commands 712
- OSPFv3 Commands 713
- OSPFv3 Commands 721 715
- OSPFv3 Commands 723 717
- OSPFv3 Commands 725 719
- OSPFv3 Commands 727 721
- OSPFv3 Commands 729 723
- OSPFv3 Commands 731 725
- OSPFv3 Commands 733 727
- OSPFv3 Commands 735 729
- OSPFv3 Commands 737 731
- OSPFv3 Commands 739 733
- OSPFv3 Commands 741 735
- OSPFv3 Commands 743 737
- OSPFv3 Commands 745 739
- OSPFv3 Commands 749 743
- OSPFv3 Commands 759 753
- PIM-DM Commands 755
- PIM-DM Commands 765 757
- 768 PIM-DM Commands 760
- PIM-SM Commands 761
- PIM-SM Commands 771 763
- PIM-SM Commands 773 765
- PIM-SM Commands 775 767
- PIM-SM Commands 777 769
- PIM-SM Commands 779 771
- PIM-SM Commands 781 773
- 782 PIM-SM Commands 774
- Commands 781
- Tunnel Interface Commands 793
- Tunnel Interface Commands 805 795
- Virtual LAN Routing Commands 797
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