Contents

home

Configuring ARP

Overview

ARP message format

ARP operating mechanism

ARP table

Configuring a static ARP entry

Configuring a multiport ARP entry

Setting the maximum number of dynamic ARP entries for a device

Setting the maximum number of dynamic ARP entries for an interface

Setting the aging timer for dynamic ARP entries

Enabling dynamic ARP entry check

Synchronizing ARP entries

Enabling ARP logging

Displaying and maintaining ARP

Configuration examples

Long static ARP entry configuration example

Short static ARP entry configuration example

Multiport ARP entry configuration example

Configuring gratuitous ARP

Overview

Gratuitous ARP packet learning

Periodic sending of gratuitous ARP packets

Configuration procedure

Enabling IP conflict notification

Configuring proxy ARP

Enabling common proxy ARP

Enabling local proxy ARP

Displaying proxy ARP

Common proxy ARP configuration example

Network requirements

Configuration procedure

Verifying the configuration

Configuring ARP snooping

Configuration procedure

Displaying and maintaining ARP snooping

Configuring ARP direct route advertisement

Overview

Configuration procedure

Configuring IP addressing

Overview

IP address classes

Special IP addresses

Subnetting and masking

Assigning an IP address to an interface

Configuration guidelines

Configuration procedure

Configuring IP unnumbered

Configuration guidelines

Configuration prerequisites

Configuration procedure

Displaying and maintaining IP addressing

IP address configuration example

Network requirements

Configuration procedure

Verifying the configuration

DHCP overview

DHCP address allocation

Allocation mechanisms

IP address allocation process

IP address lease extension

DHCP message format

DHCP options

Common DHCP options

Custom DHCP options

Protocols and standards

Configuring the DHCP server

Overview

DHCP address pool

IP address allocation sequence

DHCP server configuration task list

Configuring an address pool on the DHCP server

Configuration task list

Creating a DHCP address pool

Specifying IP address ranges for a DHCP address pool

Specifying gateways for DHCP clients

Specifying a domain name suffix for DHCP clients

Specifying DNS servers for DHCP clients

Specifying WINS servers and NetBIOS node type for DHCP clients

Specifying BIMS server for DHCP clients

Specifying the configuration file for DHCP client auto-configuration

Specifying a server for DHCP clients

Configuring Option 184 parameters for DHCP clients

Customizing DHCP options

Configuring the DHCP user class whitelist

Enabling DHCP

Enabling the DHCP server on an interface

Applying an address pool on an interface

Configuring a DHCP policy for dynamic address assignment

Configuring IP address conflict detection

Enabling handling of Option 82

Configuring DHCP server compatibility

Configuring the DHCP server to broadcast all responses

Configure the DHCP server to ignore BOOTP requests

Configuring the DHCP server to send BOOTP responses in RFC 1048 format

Setting the DSCP value for DHCP packets sent by the DHCP server

Configuring DHCP binding auto backup

Configuring address pool usage alarming

Enabling client offline detection on the DHCP server

Enabling DHCP logging on the DHCP server

Displaying and maintaining the DHCP server

DHCP server configuration examples

Static IP address assignment configuration example

Dynamic IP address assignment configuration example

DHCP user class configuration example

DHCP user class whitelist configuration example

Primary and secondary subnets configuration example

DHCP option customization configuration example

Troubleshooting DHCP server configuration

Symptom

Analysis

Solution

Configuring the DHCP relay agent

Overview

Operation

DHCP relay agent support for Option 82

DHCP relay agent configuration task list

Enabling DHCP

Enabling the DHCP relay agent on an interface

Specifying DHCP servers on a relay agent

Configuring the DHCP relay agent security features

Enabling the DHCP relay agent to record relay entries

Enabling periodic refresh of dynamic relay entries

Enabling DHCP starvation attack protection

Configuring the DHCP relay agent to release an IP address

Configuring Option 82

Setting the DSCP value for DHCP packets sent by the DHCP relay agent

Enabling DHCP server proxy on the DHCP relay agent

Configuring a DHCP address pool on the DHCP relay agent

Specifying the DHCP relay agent address to be inserted in DHCP requests

Enabling client offline detection on the DHCP relay agent

Configuring the DHCP smart relay feature

Specifying the DHCP server selecting algorithm

Specifying the source IP address for relayed DHCP requests

Displaying and maintaining the DHCP relay agent

DHCP relay agent configuration examples

DHCP relay agent configuration example

Option 82 configuration example

DHCP server selection configuration example

Troubleshooting DHCP relay agent configuration

Symptom

Analysis

Solution

Configuring the DHCP client

Enabling the DHCP client on an interface

Configuring a DHCP client ID for an interface

Enabling duplicated address detection

Setting the DSCP value for DHCP packets sent by the DHCP client

Displaying and maintaining the DHCP client

DHCP client configuration example

Network requirements

Configuration procedure

Verifying the configuration

Configuring DHCP snooping

Overview

Application of trusted and untrusted ports

DHCP snooping support for Option 82

DHCP snooping configuration task list

Configuring basic DHCP snooping features

Configuring basic DHCP snooping features in a common network

Disabling DHCP snooping on an interface

Configuring Option 82

Configuring DHCP snooping entry auto backup

Enabling DHCP starvation attack protection

Enabling DHCP-REQUEST attack protection

Setting the maximum number of DHCP snooping entries

Configuring DHCP packet rate limit

Configuring a DHCP packet blocking port

Enabling DHCP snooping logging

Displaying and maintaining DHCP snooping

DHCP snooping configuration examples

Global basic DHCP snooping configuration example

VLAN-specific DHCP snooping configuration example

Option 82 configuration example

Configuring the BOOTP client

BOOTP application

Obtaining an IP address dynamically

Protocols and standards

Configuring an interface to use BOOTP for IP address acquisition

Displaying and maintaining BOOTP client

BOOTP client configuration example

Network requirements

Configuration procedure

Verifying the configuration

Configuring DNS

Overview

Static domain name resolution

Dynamic domain name resolution

DNS proxy

DNS spoofing

DNS configuration task list

Configuring the IPv4 DNS client

Configuring static domain name resolution

Configuring dynamic domain name resolution

Configuring the IPv6 DNS client

Configuring static domain name resolution

Configuring dynamic domain name resolution

Configuring the DNS proxy

Configuring DNS spoofing

Specifying the source interface for DNS packets

Configuring the DNS trusted interface

Setting the DSCP value for outgoing DNS packets

Displaying and maintaining DNS

IPv4 DNS configuration examples

Static domain name resolution configuration example

Dynamic domain name resolution configuration example

DNS proxy configuration example

IPv6 DNS configuration examples

Static domain name resolution configuration example

Dynamic domain name resolution configuration example

DNS proxy configuration example

Troubleshooting IPv4 DNS configuration

Failure to resolve IPv4 addresses

Troubleshooting IPv6 DNS configuration

Failure to resolve IPv6 addresses

Configuring DDNS

Overview

DDNS application

DDNS client configuration task list

Configuring a DDNS policy

Configuration prerequisites

Configuration procedure

Applying the DDNS policy to an interface

Setting the DSCP value for outgoing DDNS packets

Displaying DDNS

DDNS configuration examples

DDNS configuration example with www.3322.org

DDNS configuration example with PeanutHull server

Configuring IP forwarding basic settings

FIB table

Saving the IP forwarding entries to a file

Displaying FIB table entries

Configuring fast forwarding

Overview

Configuring the aging time for fast forwarding entries

Displaying and maintaining fast forwarding

Configuring IRDP

Overview

IRDP operation

Basic concepts

Protocols and standards

Configuration procedure

IRDP configuration example

Network requirements

Configuration procedure

Verifying the configuration

Optimizing IP performance

Enabling an interface to forward directed broadcasts destined for the directly connected network

Configuration procedure

Configuration example

Setting the MTU of IPv4 packets sent over an interface

Setting TCP MSS for an interface

Configuring TCP path MTU discovery

Enabling SYN Cookie

Setting the TCP buffer size

Setting TCP timers

Enabling sending ICMP error messages

Disabling forwarding ICMP fragments

Configuring rate limit for ICMP error messages

Specifying the source address for ICMP packets

Displaying and maintaining IP performance optimization

Configuring UDP helper

Overview

Configuration restrictions and guidelines

Configuring UDP helper to convert broadcast to unicast

Configuring UDP helper to convert broadcast to multicast

Displaying and maintaining UDP helper

UDP helper configuration examples

Configuring UDP helper to convert broadcast to unicast

Configuring basic IPv6 settings

Overview

IPv6 features

IPv6 addresses

IPv6 ND protocol

IPv6 path MTU discovery

IPv6 transition technologies

Dual stack

Protocols and standards

IPv6 basics configuration task list

Assigning IPv6 addresses to interfaces

Configuring an IPv6 global unicast address

Configuring an IPv6 link-local address

Configuring an IPv6 anycast address

Configuring IPv6 ND

Configuring a static neighbor entry

Setting the maximum number of dynamic neighbor entries

Setting the aging timer for ND entries in stale state

Minimizing link-local ND entries

Setting the hop limit

Configuring parameters for RA messages

Setting the maximum number of attempts to send an NS message for DAD

Configuring ND snooping

Enabling ND proxy

Configuring path MTU discovery

Setting the interface MTU

Setting a static path MTU for an IPv6 address

Setting the aging time for dynamic path MTUs

Controlling sending ICMPv6 messages

Configuring the rate limit for ICMPv6 error messages

Enabling replying to multicast echo requests

Enabling sending ICMPv6 destination unreachable messages

Enabling sending ICMPv6 time exceeded messages

Enabling sending ICMPv6 redirect messages

Specifying the source address for ICMPv6 packets

Enabling IPv6 local fragment reassembly

Displaying and maintaining IPv6 basics

IPv6 configuration examples

Basic IPv6 configuration example

ND snooping configuration example

Troubleshooting IPv6 basics configuration

Symptom

Solution

DHCPv6 overview

DHCPv6 address/prefix assignment

Rapid assignment involving two messages

Assignment involving four messages

Address/prefix lease renewal

Stateless DHCPv6

Protocols and standards

Configuring the DHCPv6 server

Overview

IPv6 address assignment

IPv6 prefix assignment

Concepts

DHCPv6 address pool

IPv6 address/prefix allocation sequence

Configuration task list

Configuring IPv6 prefix assignment

Configuration guidelines

Configuration procedure

Configuring IPv6 address assignment

Configuration guidelines

Configuration procedure

Configuring network parameters assignment

Configuring network parameters in a DHCPv6 address pool

Configuring network parameters in a DHCPv6 option group

Configuring a DHCPv6 policy for IPv6 address and prefix assignment

Configuring the DHCPv6 server on an interface

Configuration guidelines

Configuration procedure

Setting the DSCP value for DHCPv6 packets sent by the DHCPv6 server

Configuring DHCPv6 binding auto backup

Enabling the DHCPv6 server to advertise IPv6 prefixes

Enabling DHCPv6 logging on the DHCPv6 server

Displaying and maintaining the DHCPv6 server

DHCPv6 server configuration examples

Dynamic IPv6 prefix assignment configuration example

Dynamic IPv6 address assignment configuration example

Configuring the DHCPv6 relay agent

Overview

DHCPv6 relay agent configuration task list

Enabling the DHCPv6 relay agent on an interface

Specifying DHCPv6 servers on the relay agent

Setting the DSCP value for DHCPv6 packets sent by the DHCPv6 relay agent

Specifying a padding mode for the Interface-ID option

Configuring a DHCPv6 address pool on the DHCPv6 relay agent

Specifying a gateway address for DHCPv6 clients

Enabling the DHCPv6 relay agent to record relay entries

Enabling IPv6 release notification

Enabling client offline detection

Enabling the DHCPv6 relay agent to advertise IPv6 prefixes

Displaying and maintaining the DHCPv6 relay agent

DHCPv6 relay agent configuration example

Network requirements

Configuration procedure

Verifying the configuration

Configuring the DHCPv6 client

Overview

DHCPv6 client configuration task list

Configuring IPv6 address acquisition

Configuring IPv6 prefix acquisition

Configuring IPv6 address and prefix acquisition

Configuring stateless DHCPv6

Configuring the DHCPv6 client DUID

Setting the DSCP value for DHCPv6 packets sent by the DHCPv6 client

Displaying and maintaining DHCPv6 client

DHCPv6 client configuration examples

IPv6 address acquisition configuration example

IPv6 prefix acquisition configuration example

IPv6 address and prefix acquisition configuration example

Stateless DHCPv6 configuration example

Configuring DHCPv6 snooping

Overview

Application of trusted and untrusted ports

Implementation of Option 18 and Option 37

Option 18 for DHCPv6 snooping

DHCPv6 snooping support for Option 37

DHCPv6 snooping configuration task list

Configuring basic DHCPv6 snooping

Configuring Option 18 and Option 37

Configuring DHCPv6 snooping entry auto backup

Setting the maximum number of DHCPv6 snooping entries

Configuring DHCPv6 packet rate limit

Enabling DHCPv6-REQUEST check

Configuring a DHCPv6 packet blocking port

Enabling DHCPv6 snooping logging

Displaying and maintaining DHCPv6 snooping

DHCPv6 snooping configuration example

Network requirements

Configuration procedure

Verifying the configuration

Configuring IPv6 fast forwarding

Overview

Configuring the aging time for IPv6 fast forwarding entries

Displaying and maintaining IPv6 fast forwarding

Document conventions and icons

Conventions

Network topology icons

Support and other resources

Accessing Hewlett Packard Enterprise Support

Accessing updates

Websites

Customer self repair

Remote support

Documentation feedback