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Understanding DHCP Option 82 for Port Security on J-EX Series Switches . . . 2560
DHCP Option 82 Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2560
Suboption Components of Option 82 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2561
Configurations of the J-EX Series Switch That Support Option 82 . . . . . . . 2561
Switch and Clients Are on Same VLAN as DHCP Server . . . . . . . . . . . 2561
Switch Acts as Relay Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2562
Understanding IP Source Guard for Port Security on J-EX Series Switches . . . 2563
IP Address Spoofing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2564
How IP Source Guard Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2564
The IP Source Guard Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2564
Typical Uses of Other Junos OS Features with IP Source Guard . . . . . . . . 2565
Understanding Proxy ARP on J-EX Series Switches . . . . . . . . . . . . . . . . . . . . . . 2566
What Is ARP? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2566
Proxy ARP Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2566
Best Practices for Proxy ARP on J-EX Series Switches . . . . . . . . . . . . . . . . 2567
Examples: Port Security Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2569
Example: Configuring Port Security, with DHCP Snooping, DAI, MAC Limiting,
and MAC Move Limiting, on a J-EX Series Switch . . . . . . . . . . . . . . . . . . . . 2569
Example: Configuring MAC Limiting, Including Dynamic and Allowed MAC
Addresses, to Protect the Switch from Ethernet Switching Table Overflow
Attacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2576
Example: Configuring a DHCP Server Interface as Untrusted to Protect the Switch
from Rogue DHCP Server Attacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2579
Example: Configuring MAC Limiting to Protect the Switch from DHCP Starvation
Attacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2583
Example: Configuring DHCP Snooping and DAI to Protect the Switch from ARP
Spoofing Attacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2586
Example: Configuring Allowed MAC Addresses to Protect the Switch from DHCP
Snooping Database Alteration Attacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2590
Example: Configuring DHCP Snooping, DAI , and MAC Limiting on a J-EX Series
Switch with Access to a DHCP Server Through a Second Switch . . . . . . . 2593
Example: Configuring IP Source Guard with Other J-EX Series Switch Features
to Mitigate Address-Spoofing Attacks on Untrusted Access Interfaces . . 2600
Example: Configuring IP Source Guard on a Data VLAN That Shares an Interface
with a Voice VLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2608
Example: Setting Up DHCP Option 82 with a J-EX Series Switch as Relay Agent
Between Clients and a DHCP Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2615
Example: Setting Up DHCP Option 82 on a J-EX Series Switch with No Relay
Agent Between Clients and DHCP Server . . . . . . . . . . . . . . . . . . . . . . . . . . . 2617
Example: Configuring Proxy ARP on a J-EX Series Switch . . . . . . . . . . . . . . . . . 2621
Configuring Port Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2625
Configuring Port Security (CLI Procedure) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2626
Configuring Port Security (J-Web Procedure) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2627
Enabling DHCP Snooping (CLI Procedure) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2630
Enabling DHCP Snooping (J-Web Procedure) . . . . . . . . . . . . . . . . . . . . . . . . . . 2631
Enabling a Trusted DHCP Server (CLI Procedure) . . . . . . . . . . . . . . . . . . . . . . . 2632
Enabling a Trusted DHCP Server (J-Web Procedure) . . . . . . . . . . . . . . . . . . . . . 2632
Enabling Dynamic ARP Inspection (CLI Procedure) . . . . . . . . . . . . . . . . . . . . . . 2633
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Dell PowerConnect J-Series Ethernet Switch Complete Software Guide for Junos OS
Summary of Contents for PowerConnect J-EX8208
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Page 273: ...CHAPTER 17 Operational Mode Commands for System Setup 201 ...
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Page 383: ...CHAPTER 21 Configuration Statements for Power Management 311 ...
Page 387: ...CHAPTER 22 Operational Mode Commands for Power Management 315 ...
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Page 431: ...CHAPTER 27 Operational Mode Commands for Configuration Management 359 ...
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Page 505: ...CHAPTER 33 Operational Mode Commands for User and Access Management 433 ...
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Page 581: ...CHAPTER 38 Operational Mode Commands for System Services 509 ...
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Page 631: ...CHAPTER 41 Configuration Statements for System Monitoring 559 ...
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Page 683: ...CHAPTER 42 Operational Mode Commands for System Monitoring 611 ...
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Page 907: ...CHAPTER 49 Operational Mode Commands for Virtual Chassis 835 ...
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Page 1061: ...CHAPTER 56 Operational Mode Commands for Interfaces 989 ...
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Page 1297: ...CHAPTER 63 Operational Mode Commands for Bridging and VLANs 1225 ...
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Page 1461: ...CHAPTER 69 Operational Mode Commands for Spanning Tree Protocols 1389 ...
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Page 1819: ...CHAPTER 74 Operational Commands for Layer 3 Protocols 1747 ...
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Page 2215: ...CHAPTER 80 Operational Mode Commands for IGMP Snooping and Multicast 2143 ...
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Page 2341: ...Figure 49 Topology for Configuration 2269 Chapter 82 Examples Access Control Configuration ...
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Page 2537: ...CHAPTER 86 Operational Commands for 802 1X 2465 ...
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Page 2607: ...CHAPTER 92 Operational Mode Commands for Rate Limiting 2535 ...
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Page 2777: ...CHAPTER 99 Operational Mode Commands for Port Security 2705 ...
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Page 2907: ...CHAPTER 106 Operational Mode Commands for Firewall Filters 2835 ...
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Page 3049: ...CHAPTER 112 Operational Mode Commands for CoS 2977 ...
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Page 3117: ...CHAPTER 119 Operational Mode Commands for PoE 3045 ...
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Page 3211: ...CHAPTER 125 Operational Mode Commands for MPLS 3139 ...
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Page 3603: ...CHAPTER 134 Operational Mode Commands for General Network Management and Monitoring 3531 ...
Page 3619: ...PART 25 Index Index on page 3549 3547 ...
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