iv
Configuring a DHCP client ID for an interface ································································································· 86
Enabling duplicated address detection ············································································································ 87
Setting the DSCP value for DHCP packets sent by the DHCP client ······························································ 87
Displaying and maintaining the DHCP client ··································································································· 87
DHCP client configuration example ················································································································· 88
Network requirements ······························································································································ 88
Configuration procedure ··························································································································· 88
Verifying the configuration ························································································································ 89
Configuring DHCP snooping ········································································· 91
Overview ·························································································································································· 91
Application of trusted and untrusted ports ································································································ 91
DHCP snooping support for Option 82 ····································································································· 92
Command and hardware compatibility ············································································································· 93
DHCP snooping configuration task list ············································································································· 93
Configuring basic DHCP snooping ·················································································································· 94
Configuring Option 82 ······································································································································ 95
Configuring DHCP snooping entry auto backup ······························································································ 96
Enabling DHCP starvation attack protection ···································································································· 97
Enabling DHCP-REQUEST attack protection ·································································································· 97
Setting the maximum number of DHCP snooping entries ··············································································· 98
Configuring DHCP packet rate limit ················································································································· 99
Configuring a DHCP packet blocking port ······································································································· 99
Enabling DHCP snooping logging ·················································································································· 100
Displaying and maintaining DHCP snooping ································································································· 100
DHCP snooping configuration examples ······································································································· 101
Basic DHCP snooping configuration example ······················································································· 101
Option 82 configuration example ··········································································································· 102
Configuring the BOOTP client ····································································· 104
BOOTP application ········································································································································ 104
Obtaining an IP address dynamically ············································································································· 104
Protocols and standards ································································································································ 104
Configuring an interface to use BOOTP for IP address acquisition ······························································· 104
Displaying and maintaining BOOTP client ····································································································· 105
BOOTP client configuration example ············································································································· 105
Network requirements ···························································································································· 105
Configuration procedure ························································································································· 105
Verifying the configuration ······················································································································ 105
Configuring DNS ························································································· 106
Overview ························································································································································ 106
Static domain name resolution ··············································································································· 106
Dynamic domain name resolution ·········································································································· 106
DNS proxy ·············································································································································· 107
DNS spoofing ········································································································································· 108
DNS configuration task list ····························································································································· 109
Configuring the IPv4 DNS client ···················································································································· 109
Configuring static domain name resolution ···························································································· 109
Configuring dynamic domain name resolution ······················································································· 110
Configuring the IPv6 DNS client ···················································································································· 111
Configuring static domain name resolution ···························································································· 111
Configuring dynamic domain name resolution ······················································································· 111
Configuring the DNS proxy ···························································································································· 112
Configuring DNS spoofing ····························································································································· 113
Configuring network mode tracking for an output interface ··········································································· 113
Specifying the source interface for DNS packets ··························································································· 114
Configuring the DNS trusted interface ··········································································································· 114
Setting the DSCP value for outgoing DNS packets ······················································································· 115
Displaying and maintaining DNS ··················································································································· 115
IPv4 DNS configuration examples ················································································································· 115
Static domain name resolution configuration example ··········································································· 115
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