iii
Enabling the DHCP server on an interface ······································································································ 53
Applying an address pool on an interface ········································································································ 53
Configuring a DHCP policy for dynamic address assignment ········································································· 53
Configuring IP address conflict detection ········································································································· 54
Enabling handling of Option 82 ························································································································ 55
Configuring DHCP server compatibility ············································································································ 55
Configuring the DHCP server to broadcast all responses ········································································ 55
Configure the DHCP server to ignore BOOTP requests ·········································································· 56
Configuring the DHCP server to send BOOTP responses in RFC 1048 format ······································ 56
Setting the DSCP value for DHCP packets sent by the DHCP server ····························································· 56
Configuring DHCP binding auto backup ·········································································································· 57
Configuring address pool usage alarming ······································································································· 57
Binding gateways to a common MAC address ································································································ 58
Advertising subnets assigned to clients ··········································································································· 58
Applying a DHCP address pool to a VPN instance ·························································································· 59
Enabling client offline detection on the DHCP server ······················································································ 60
Enabling DHCP logging on the DHCP server ·································································································· 60
Displaying and maintaining the DHCP server ·································································································· 61
DHCP server configuration examples ·············································································································· 61
Static IP address assignment configuration example ·············································································· 61
Dynamic IP address assignment configuration example ········································································· 63
DHCP user class configuration example ·································································································· 65
DHCP user class whitelist configuration example ···················································································· 66
Primary and secondary subnets configuration example ·········································································· 67
DHCP option customization configuration example ················································································· 69
Troubleshooting DHCP server configuration ··································································································· 70
Symptom ·················································································································································· 70
Analysis ···················································································································································· 70
Solution ···················································································································································· 70
Configuring the DHCP relay agent ································································ 72
Overview ·························································································································································· 72
Operation ················································································································································· 72
DHCP relay agent support for Option 82 ································································································· 73
DHCP relay agent configuration task list ········································································································· 73
Enabling DHCP ················································································································································ 74
Enabling the DHCP relay agent on an interface ······························································································ 74
Specifying DHCP servers on a relay agent ······································································································ 74
Specifying the source address and gateway address in DHCP requests ························································ 75
Configuring the DHCP relay agent security features ······················································································· 75
Enabling the DHCP relay agent to record relay entries ··········································································· 75
Enabling periodic refresh of dynamic relay entries ·················································································· 76
Enabling DHCP starvation attack protection ···························································································· 76
Configuring the DHCP relay agent to release an IP address ··········································································· 77
Configuring Option 82 ······································································································································ 78
Setting the DSCP value for DHCP packets sent by the DHCP relay agent ····················································· 78
Enabling DHCP server proxy on a DHCP relay agent ····················································································· 79
Configuring a DHCP relay address pool ·········································································································· 79
Specifying a gateway address for DHCP clients ······························································································ 80
Enabling client offline detection on the DHCP relay agent ·············································································· 80
Configuring the DHCP smart relay feature ······································································································ 81
Displaying and maintaining the DHCP relay agent ·························································································· 82
DHCP relay agent configuration examples ······································································································ 83
DHCP relay agent configuration example ································································································ 83
Option 82 configuration example ············································································································· 84
Troubleshooting DHCP relay agent configuration ···························································································· 84
Symptom ·················································································································································· 84
Analysis ···················································································································································· 84
Solution ···················································································································································· 84
Configuring the DHCP client ········································································· 86
Enabling the DHCP client on an interface ········································································································ 86
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