iv
Application of trusted and untrusted ports ································································································ 84
DHCP snooping support for Option 82 ····································································································· 85
Command and hardware compatibility ············································································································· 85
DHCP snooping configuration task list ············································································································· 85
Configuring basic DHCP snooping ·················································································································· 86
Configuring Option 82 ······································································································································ 86
Configuring DHCP snooping entry auto backup ······························································································ 87
Enabling DHCP starvation attack protection ···································································································· 88
Enabling DHCP-REQUEST attack protection ·································································································· 89
Setting the maximum number of DHCP snooping entries ··············································································· 89
Displaying and maintaining DHCP snooping ··································································································· 90
DHCP snooping configuration examples ········································································································· 90
Basic DHCP snooping configuration example ························································································· 90
Option 82 configuration example ············································································································· 91
Configuring the BOOTP client ······································································· 93
BOOTP application ·········································································································································· 93
Obtaining an IP address dynamically ··············································································································· 93
Protocols and standards ·································································································································· 93
Configuring an interface to use BOOTP for IP address acquisition ································································· 93
Displaying and maintaining BOOTP client ······································································································· 94
BOOTP client configuration example ··············································································································· 94
Network requirements ······························································································································ 94
Configuration procedure ··························································································································· 94
Verifying the configuration ························································································································ 94
Configuring DNS ··························································································· 95
Overview ·························································································································································· 95
Static domain name resolution ················································································································· 95
Dynamic domain name resolution ············································································································ 95
DNS proxy ················································································································································ 96
DNS spoofing ··········································································································································· 97
DNS configuration task list ······························································································································· 98
Configuring the IPv4 DNS client ······················································································································ 98
Configuring static domain name resolution ······························································································ 98
Configuring dynamic domain name resolution ························································································· 99
Configuring the IPv6 DNS client ······················································································································ 99
Configuring static domain name resolution ······························································································ 99
Configuring dynamic domain name resolution ······················································································· 100
Configuring the DNS proxy ···························································································································· 101
Configuring DNS spoofing ····························································································································· 101
Configuring network mode tracking for an output interface ··········································································· 102
Specifying the source interface for DNS packets ··························································································· 102
Configuring the DNS trusted interface ··········································································································· 103
Setting the DSCP value for outgoing DNS packets ······················································································· 103
Displaying and maintaining IPv4 DNS ··········································································································· 103
IPv4 DNS configuration examples ················································································································· 104
Static domain name resolution configuration example ··········································································· 104
Dynamic domain name resolution configuration example ······································································ 105
DNS proxy configuration example ·········································································································· 107
IPv6 DNS configuration examples ················································································································· 108
Static domain name resolution configuration example ··········································································· 108
Dynamic domain name resolution configuration example ······································································ 109
DNS proxy configuration example ·········································································································· 114
Troubleshooting IPv4 DNS configuration ······································································································· 115
Symptom ················································································································································ 115
Solution ·················································································································································· 115
Troubleshooting IPv6 DNS configuration ······································································································· 115
Symptom ················································································································································ 115
Solution ·················································································································································· 115
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