5.1 Introduction to DHCPv6.................................................................................................................................102

5.2 DHCPv6 Features Supported by the S9300&S9300E....................................................................................103

5.3 Configuring DHCPv6 Relay...........................................................................................................................105

5.3.1 Establishing the Configuration Task.....................................................................................................105

5.3.2 Enabling the DHCPv6 Relay Function..................................................................................................105

5.3.3 (Optional) Configuring the Remote ID.................................................................................................106

5.3.4 (Optional) Configuring Rate Limit of DHCPv6 Messages...................................................................108

5.3.5 Checking the Configuration...................................................................................................................108

5.4 Maintaining DHCPv6.....................................................................................................................................109

5.4.1 Clearing the Statistics About DHCPv6 Messages Passing Through the DHCP Relay Agent..............109

5.4.2 Monitoring the Running Status of the DHCPv6 Relay Agent...............................................................109

5.5 Configuration Examples.................................................................................................................................110

5.5.1 Example for Configuring DHCPv6 Relay.............................................................................................110

6 IP Performance Configuration................................................................................................114

6.1 Introduction to IP Performance......................................................................................................................115

6.2 IP Performance Supported by the S9300&S9300E........................................................................................115

6.3 Optimizing IP Performance............................................................................................................................115

6.3.1 Establishing the Configuration Task.....................................................................................................115

6.3.2 Enabling an Interface to Check the Source IP Addresses of Packets....................................................116

6.3.3 Configuring Forcible Fragmentation of Outgoing Packets on an Interface..........................................117

6.3.4 Setting ICMP Parameters......................................................................................................................117

6.3.5 Setting TCP Parameters.........................................................................................................................119

6.3.6 (Optional) Setting the Load Balancing Mode of IP Packet Forwarding...............................................120

6.3.7 Checking the Configuration...................................................................................................................121

6.4 Maintaining IP Performance...........................................................................................................................121

6.4.1 Clearing IP Performance Statistics........................................................................................................122

6.4.2 Monitoring the Running Status of IP Performance...............................................................................122

6.4.3 Debugging IP Performance...................................................................................................................123

6.5 Configuration Examples.................................................................................................................................124

6.5.1 Example for Disabling the Sending of ICMP Redirection Packets.......................................................124

6.5.2 Example for Disabling the Sending of ICMP Host Unreachable Packets.............................................127

6.5.3 Example for Optimizing System Performance by Discarding Certain ICMP Packets..........................130

7 UDP Helper Configuration......................................................................................................132

7.1 Introduction to UDP Helper...........................................................................................................................133

7.2 UDP Helper Features Supported by the S9300&S9300E..............................................................................133

7.3 Configuring UDP Helper................................................................................................................................134

7.3.1 Establishing the Configuration Task.....................................................................................................134

7.3.2 Enabling the UDP Helper Function.......................................................................................................134

7.3.3 Configuring the UDP Port on Which Packets Are Forwarded..............................................................135

7.3.4 Configuring the Destination Server to Which Packets of the UDP Port Need to Be Forwarded..........135

7.3.5 Checking the Configuration...................................................................................................................136

7.4 Maintaining UDP Helper................................................................................................................................136

Issue 01 (2012-03-15)

Huawei Proprietary and Confidential

Contents

vii

Table of Contents