H3C Technologies H3C S10500 Series Switches - Manual (Page 8)

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Correlating a DHCP server group with a relay agent interface················································································ 58
Configuring the DHCP relay agent security functions ································································································ 59
Configuring address check ·································································································································· 59
Configuring periodic refresh of dynamic client entries ····················································································· 59
Enabling unauthorized DHCP server detection·································································································· 60
Enabling DHCP starvation attack protection ······································································································ 60
Enabling offline detection·············································································································································· 61
Configuring the DHCP relay agent to release an IP address ···················································································· 61
Configuring the DHCP relay agent to support Option 82························································································· 62
Displaying and maintaining the DHCP relay agent ··································································································· 63
DHCP relay agent configuration examples ················································································································· 64
DHCP relay agent configuration example·········································································································· 64
DHCP relay agent Option 82 support configuration example········································································· 65
Troubleshooting DHCP relay agent configuration······································································································ 66
DHCP client configuration ·········································································································································67
Introduction to DHCP client ··········································································································································· 67
Enabling the DHCP client on an interface··················································································································· 67
Displaying and maintaining the DHCP client·············································································································· 67
DHCP client configuration example ····························································································································· 68
DHCP snooping configuration ··································································································································70
DHCP snooping overview ············································································································································· 70
Functions of DHCP snooping································································································································ 70
Application environment of trusted ports ············································································································ 71
DHCP snooping support for Option 82·············································································································· 72
DHCP snooping configuration task list ························································································································ 73
Configuring DHCP snooping basic functions·············································································································· 73
Configuring DHCP snooping to support Option 82··································································································· 74
Configuring DHCP snooping entries backup·············································································································· 75
Enabling DHCP starvation attack protection ··············································································································· 76
Enabling DHCP-REQUEST message attack protection ······························································································· 77
Configuring DHCP packet rate limit····························································································································· 77
Displaying and maintaining DHCP snooping ············································································································· 78
DHCP snooping configuration examples····················································································································· 79
DHCP snooping configuration example ············································································································· 79
DHCP snooping Option 82 support configuration example ············································································ 79
IPv4 DNS configuration·············································································································································81
DNS overview ································································································································································ 81
Static domain name resolution····························································································································· 81
Dynamic domain name resolution······················································································································· 81
Configuring the IPv4 DNS client··································································································································· 82
Configuring static domain name resolution········································································································ 82
Configuring dynamic domain name resolution·································································································· 83
Displaying and maintaining IPv4 DNS························································································································ 83
IPv4 DNS configuration examples ······························································································································· 84
Static domain name resolution configuration example ····················································································· 84
Dynamic domain name resolution configuration example ··············································································· 85
Troubleshooting IPv4 DNS configuration ···················································································································· 88
IP performance optimization configuration··············································································································89
Enabling receiving and forwarding of directed broadcasts to a directly connected network······························· 89
Enabling receiving of directed broadcasts to a directly connected network·················································· 89
Enabling forwarding of directed broadcasts to a directly connected network··············································· 89
Configuration example ········································································································································· 90