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Configuring ARP

Overview

ARP message format

ARP operation

ARP table

Configuring a static ARP entry

Configuring a multiport ARP entry

Configuring the maximum number of dynamic ARP entries for an interface

Setting the aging timer for dynamic ARP entries

Enabling dynamic ARP entry check

Configuring ARP quick update

Configuring multicast ARP

Displaying and maintaining ARP

ARP configuration examples

Static ARP entry configuration example

Multicast ARP configuration example

Configuring gratuitous ARP

Overview

Gratuitous ARP packet learning

Periodic sending of gratuitous ARP packets

Configuration guidelines

Configuration procedure

Enabling IP conflict notification

Configuring proxy ARP

Overview

Common proxy ARP

Local proxy ARP

Enabling common proxy ARP

Enabling local proxy ARP

Displaying and maintaining proxy ARP

Proxy ARP configuration examples

Common proxy ARP configuration example

Local proxy ARP configuration example in case of port isolation

Local proxy ARP configuration example in super VLAN

Local proxy ARP configuration example in isolate-user-VLAN

Configuring ARP snooping

Overview

Configuration procedure

Displaying and maintaining ARP snooping

Configuring IP addressing

Overview

IP address classes

Special IP addresses

Subnetting and masking

Assigning an IP address to an interface

Configuration guidelines

Configuration procedure

Configuration example

Configuring IP unnumbered

Overview

Configuration guidelines

Configuration prerequisites

Configuration procedure

Displaying and maintaining IP addressing

DHCP overview

DHCP address allocation

Dynamic IP address allocation process

IP address lease extension

DHCP message format

DHCP options

Common DHCP options

Custom options

Protocols and standards

Configuring DHCP server

Overview

DHCP address pool

IP address allocation sequence

DHCP server configuration task list

Configuring an address pool for the DHCP server

Configuration task list

Creating a DHCP address pool

Configuring address allocation mode for a common address pool

Configuring dynamic address allocation for an extended address pool

Configuring a domain name suffix for the client

Configuring DNS servers for the client

Configuring WINS servers and NetBIOS node type for the client

Configuring BIMS server information for the client

Configuring gateways for the client

Configuring Option 184 parameters for the client with voice service

Configuring the TFTP server and bootfile name for the client

Specifying a server's IP address for the DHCP client

Configuring self-defined DHCP options

Enabling DHCP

Enabling the DHCP server on an interface

Configuration guidelines

Configuration procedure

Applying an extended address pool on an interface

Configuring the DHCP server security functions

Configuration prerequisites

Enabling unauthorized DHCP server detection

Configuring IP address conflict detection

Enabling client offline detection

Enabling handling of Option 82

Configuration prerequisites

Enabling Option 82 handling

Specifying the threshold for sending trap messages

Configuration prerequisites

Configuration procedure

Setting the DSCP value for DHCP packets

Displaying and maintaining the DHCP server

DHCP server configuration examples

Static IP address assignment configuration example

Dynamic IP address assignment configuration example

Self-defined option configuration example

Troubleshooting DHCP server configuration

Symptom

Analysis

Solution

Configuring DHCP relay agent

Overview

Fundamentals

DHCP relay agent support for Option 82

DHCP relay agent configuration task list

Enabling DHCP

Enabling the DHCP relay agent on an interface

Correlating a DHCP server group with a relay agent interface

Configuration guidelines

Configuration procedure

Configuring the DHCP relay agent security functions

Configuring address check

Configuring periodic refresh of dynamic client entries

Enabling unauthorized DHCP server detection

Enabling DHCP starvation attack protection

Enabling offline detection

Configuring the DHCP relay agent to release an IP address

Configuring the DHCP relay agent to support Option 82

Configuration prerequisites

Configuration guidelines

Configuration procedure

Setting the DSCP value for DHCP packets

Displaying and maintaining the DHCP relay agent

DHCP relay agent configuration examples

DHCP relay agent configuration example

DHCP relay agent Option 82 support configuration example

Troubleshooting DHCP relay agent configuration

Symptom

Analysis

Solution

Configuring DHCP client

Configuration restrictions

Enabling the DHCP client on an interface

Setting the DSCP value for DHCP packets

Displaying and maintaining the DHCP client

DHCP client configuration example

Network requirements

Configuration procedure

Verifying the configuration

Configuring DHCP snooping

DHCP snooping functions

Ensuring that DHCP clients obtain IP addresses from authorized DHCP servers

Recording IP-to-MAC mappings of DHCP clients

Application environment of trusted ports

Configuring a trusted port connected to a DHCP server

Configuring trusted ports in a cascaded network

DHCP snooping support for Option 82

DHCP snooping configuration task list

Configuring DHCP snooping basic functions

Configuring DHCP snooping to support Option 82

Configuring DHCP snooping entries backup

Enabling DHCP starvation attack protection

Enabling DHCP-REQUEST message attack protection

Configuring DHCP packet rate limit

Displaying and maintaining DHCP snooping

DHCP snooping configuration examples

DHCP snooping configuration example

DHCP snooping on a cascaded network configuration example

DHCP snooping Option 82 support configuration example

Configuring BOOTP client

Overview

BOOTP application

Obtaining an IP address dynamically

Protocols and standards

Configuration restrictions

Configuring an interface to dynamically obtain an IP address through BOOTP

Displaying and maintaining BOOTP client configuration

BOOTP client configuration example

Network requirements

Configuration procedure

Configuring IPv4 DNS

Overview

Static domain name resolution

Dynamic domain name resolution

DNS proxy

DNS spoofing

Configuring the IPv4 DNS client

Configuring static domain name resolution

Configuring dynamic domain name resolution

Configuring the DNS proxy

Configuring DNS spoofing

Setting the DSCP value for DNS packets

Specifying the source interface for DNS packets

Displaying and maintaining IPv4 DNS

Static domain name resolution configuration example

Network requirements

Configuration procedure

Dynamic domain name resolution configuration example

Network requirements

Configuration procedure

Verifying the configuration

DNS proxy configuration example

Network requirements

Configuration procedure

Verifying the configuration

Troubleshooting IPv4 DNS configuration

Symptom

Solution

Configuring IRDP

Overview

Background

Working mechanism

Concepts

Protocols and standards

Configuration procedure

IRDP configuration example

Network requirements

Configuration procedure

Verifying the configuration

Optimizing IP performance

Enabling receiving and forwarding of directed broadcasts to a directly connected network

Enabling receiving of directed broadcasts to a directly connected network

Enabling forwarding of directed broadcasts to a directly connected network

Configuration example

Configuring TCP attributes

Configuring TCP path MTU discovery

Configuring the TCP send/receive buffer size

Configuring TCP timers

Configuring ICMP to send error packets

Advantages of sending ICMP error packets

Disadvantages of sending ICMP error packets

Configuration procedure

Enabling support for ICMP extensions

ICMP extensions for MPLS

Handling ICMP messages

Configuration procedure

Displaying and maintaining IP performance optimization

Configuring UDP helper

Overview

Configuration restrictions and guidelines

Configuration procedure

Displaying and maintaining UDP helper

UDP helper configuration example

Network requirements

Configuration procedure

Configuring IPv6 basics

Overview

IPv6 features

IPv6 addresses

IPv6 neighbor discovery protocol

IPv6 path MTU discovery

IPv6 transition technologies

Protocols and standards

IPv6 basics configuration task list

Configuring basic IPv6 functions

Enabling IPv6

Configuring an IPv6 global unicast address

Configuring an IPv6 link-local address

Configure an IPv6 anycast address

Configuring IPv6 ND

Configuring a static neighbor entry

Configuring the maximum number of neighbors dynamically learned

Setting the age timer for ND entries in stale state

Configuring parameters related to RA messages

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

Configuring ND snooping

Enabling ND proxy

Configuring path MTU discovery

Configuring a static path MTU for a specific IPv6 address

Configuring the aging time for dynamic path MTUs

Configuring IPv6 TCP properties

Configuring ICMPv6 packet sending

Configuring the maximum ICMPv6 error packets sent in an interval

Enabling replying to multicast echo requests

Enabling sending ICMPv6 time exceeded messages

Enabling sending ICMPv6 destination unreachable messages

Configuring multicast ND

Displaying and maintaining IPv6 basics configuration

IPv6 basics configuration example

Network requirements

Configuration procedure

Verifying the configuration

Troubleshooting IPv6 basics configuration

Symptom

Solution

DHCPv6 overview

Hardware compatibility

Introduction to DHCPv6

DHCPv6 address/prefix assignment

Rapid assignment involving two messages

Assignment involving four messages

Address/prefix lease renewal

Configuring stateless DHCPv6

Operation

Protocols and standards

Configuring DHCPv6 server

Overview

Concepts

Prefix selection process

DHCPv6 server configuration task list

Enabling the DHCPv6 server

Creating a prefix pool

Configuring a DHCPv6 address pool

Configuration restrictions and guidelines

Configuration procedure

Applying the address pool to an interface

Setting the DSCP value for DHCPv6 packets

Displaying and maintaining the DHCPv6 server

DHCPv6 server configuration example

Network requirements

Configuration considerations

Configuration procedure

Verifying the configuration

Configuring DHCPv6 relay agent

Overview

DHCPv6 relay agent operation

Configuring the DHCPv6 relay agent

Configuration guidelines

Configuration procedure

Setting the DSCP value for DHCPv6 packets

Displaying and maintaining the DHCPv6 relay agent

DHCPv6 relay agent configuration example

Network requirements

Configuration procedure

Verifying the configuration

Configuring DHCPv6 client

Overview

Configuring the DHCPv6 client

Configuration prerequisites

Configuration guidelines

Configuration procedure

Setting the DSCP value for DHCPv6 packets

Displaying and maintaining the DHCPv6 client

Stateless DHCPv6 configuration example

Network requirements

Configuration procedure

Verifying the configuration

Configuring DHCPv6 snooping

Overview

Ensuring that DHCPv6 clients obtain IPv6 addresses from authorized DHCPv6 servers

Recording IP-to-MAC mappings of DHCPv6 clients

Enabling DHCPv6 snooping

Configuring a DHCPv6 snooping trusted port

Configuring the maximum number of DHCPv6 snooping entries an interface can learn

Configuring DHCPv6 snooping to support Option 18 and Option 37

Displaying and maintaining DHCPv6 snooping

DHCPv6 snooping configuration example

Network requirements

Configuration procedure

Verifying the configuration

Configuring IPv6 DNS

Overview

Configuring the IPv6 DNS client

Configuring static domain name resolution

Configuring dynamic domain name resolution

Setting the DSCP value for IPv6 DNS packets

Displaying and maintaining IPv6 DNS

Static domain name resolution configuration example

Network requirements

Configuration procedure

Dynamic domain name resolution configuration example

Network requirements

Configuration procedure

Verifying the configuration

Configuring tunneling

Overview

IPv6 over IPv4 tunneling

IPv4 over IPv4 tunneling

IPv4 over IPv6 tunneling

IPv6 over IPv6 tunneling

Protocols and standards

Tunneling configuration task list

Configuring a tunnel interface

Configuration guidelines

Configuration procedure

Configuring an IPv6 manual tunnel

Configuration prerequisites

Configuration guidelines

Configuration procedure

Configuration example

Configuring a 6to4 tunnel

Configuration prerequisites

Configuration guidelines

Configuration procedure

Configuration example

Configuring an ISATAP tunnel

Configuration prerequisites

Configuration guidelines

Configuration procedure

Configuration example

Configuring an IPv4 over IPv4 tunnel

Configuration prerequisites

Configuration guidelines

Configuration procedure

Configuration example

Configuring an IPv4 over IPv6 tunnel

Configuration prerequisites

Configuration guidelines

Configuration procedure

Configuration example

Configuring an IPv6 over IPv6 tunnel

Configuration prerequisites

Configuration guidelines

Configuration procedure

Configuration example

Displaying and maintaining tunneling configuration

Troubleshooting tunneling configuration

Symptom

Solution

Configuring GRE

Overview

GRE encapsulation format

GRE encapsulation and de-encapsulation processes

Protocols and standards

Configuring a GRE over IPv4 tunnel

Configuration prerequisites

Configuration guidelines

Configuration procedure

Configuring a GRE over IPv6 tunnel

Configuration prerequisites

Configuration guidelines

Configuration procedure

Displaying and maintaining GRE

GRE over IPv4 tunnel configuration example

GRE over IPv6 tunnel configuration example

Troubleshooting GRE

Support and other resources

Contacting HP

Subscription service

Related information

Documents

Websites

Conventions