Web Management Guide-R01
Table Of Contents
- How to Use This Guide
- Contents
- Figures
- Tables
- Getting Started
- Web Configuration
- Using the Web Interface
- Basic Management Tasks
- Displaying System Information
- Displaying Hardware/Software Versions
- Configuring Support for Jumbo Frames
- Displaying Bridge Extension Capabilities
- Managing System Files
- Setting the System Clock
- Configuring the Console Port
- Configuring Telnet Settings
- Displaying CPU Utilization
- Configuring CPU Guard
- Displaying Memory Utilization
- Resetting the System
- Interface Configuration
- VLAN Configuration
- Address Table Settings
- Spanning Tree Algorithm
- Congestion Control
- Class of Service
- Quality of Service
- VoIP Traffic Configuration
- Security Measures
- AAA (Authentication, Authorization and Accounting)
- Configuring User Accounts
- Web Authentication
- Network Access (MAC Address Authentication)
- Configuring HTTPS
- Configuring the Secure Shell
- Access Control Lists
- Filtering IP Addresses for Management Access
- Configuring Port Security
- Configuring 802.1X Port Authentication
- DoS Protection
- DHCP Snooping
- DHCPv6 Snooping
- ND Snooping
- IPv4 Source Guard
- IPv6 Source Guard
- ARP Inspection
- Application Filter
- Basic Administration Protocols
- Configuring Event Logging
- Link Layer Discovery Protocol
- Simple Network Management Protocol
- Configuring Global Settings for SNMP
- Setting Community Access Strings
- Setting the Local Engine ID
- Specifying a Remote Engine ID
- Setting SNMPv3 Views
- Configuring SNMPv3 Groups
- Configuring Local SNMPv3 Users
- Configuring Remote SNMPv3 Users
- Specifying Trap Managers
- Creating SNMP Notification Logs
- Showing SNMP Statistics
- Remote Monitoring
- Switch Clustering
- Setting a Time Range
- Ethernet Ring Protection Switching
- OAM Configuration
- UDLD Configuration
- LBD Configuration
- Multicast Filtering
- Overview
- Layer 2 IGMP (Snooping and Query for IPv4)
- Configuring IGMP Snooping and Query Parameters
- Specifying Static Interfaces for a Multicast Router
- Assigning Interfaces to Multicast Services
- Setting IGMP Snooping Status per Interface
- Filtering IGMP Packets on an Interface
- Displaying Multicast Groups Discovered by IGMP Snooping
- Displaying IGMP Snooping Statistics
- Filtering and Throttling IGMP Groups
- MLD Snooping (Snooping and Query for IPv6)
- Configuring MLD Snooping and Query Parameters
- Setting Immediate Leave Status for MLD Snooping per Interface
- Specifying Static Interfaces for an IPv6 Multicast Router
- Assigning Interfaces to IPv6 Multicast Services
- Filtering MLD Query Packets on an Interface
- Showing MLD Snooping Groups and Source List
- Displaying MLD Snooping Statistics
- Filtering and Throttling MLD Groups
- Multicast VLAN Registration for IPv4
- IP Tools
- IP Configuration
- General IP Routing
- IP Services
- Appendices
Chapter 12
| Security Measures
DHCPv6 Snooping
– 359 –
DHCPv6 Snooping
The addresses assigned to DHCPv6 clients on insecure ports can be carefully
controlled using the dynamic bindings registered with DHCPv6 Snooping (or using
the static bindings configured with IPv6 Source Guard). DHCPv6 snooping allows a
switch to protect a network from rogue DHCPv6 servers or other devices which
send port-related information to a DHCPv6 server. This information can be useful in
tracking an IP address back to a physical port.
Command Usage
DHCP Snooping Process
◆ Network traffic may be disrupted when malicious DHCPv6 messages are
received from an outside source. DHCPv6 snooping is used to filter DHCPv6
messages received on a unsecured interface from outside the network or fire
wall. When DHCPv6 snooping is enabled globally and enabled on a VLAN
interface, DHCPv6 messages received on an untrusted interface from a device
not listed in the DHCPv6 snooping table will be dropped.
◆ When enabled, DHCPv6 messages entering an untrusted interface are filtered
based upon dynamic entries learned via DHCPv6 snooping.
◆ Table entries are only learned for trusted interfaces. Each entry includes a MAC
address, IPv6 address, lease time, binding type, VLAN identifier, and port
identifier.
◆ When DHCPv6 snooping is enabled, the rate limit for the number of DHCPv6
messages that can be processed by the switch is 100 packets per second. Any
DHCPv6 packets in excess of this limit are dropped.
◆ Filtering rules are implemented as follows:
■
If global DHCPv6 snooping is disabled, all DHCPv6 packets are forwarded.
■
If DHCPv6 snooping is enabled globally, and also enabled on the VLAN
where the DHCPv6 packet is received, DHCPv6 packets are forwarded for a
trusted port as described below.
■
If DHCPv6 snooping is enabled globally, and also enabled on the VLAN
where the DHCP packet is received, but the port is not trusted, DHCP
packets are processed according to message type as follows:
DHCP Client Packet
■
Request: Update entry in binding cache, recording client’s DHCPv6
Unique Identifier (DUID), server’s DUID, Identity Association (IA) type, IA
Identifier, and address (4 message exchanges to get IPv6 address), and
forward to trusted port.