Configuration procedure ··························································································································· 24

Configuring IP unnumbered ····························································································································· 24

Configuration guidelines ··························································································································· 24

Configuration prerequisites ······················································································································ 25

Configuration procedure ··························································································································· 25

Displaying and maintaining IP addressing ······································································································· 25

IP address configuration example ···················································································································· 25

Network requirements ······························································································································ 25

Configuration procedure ··························································································································· 26

Verifying the configuration ························································································································ 26

DHCP overview ··························································································· 28

DHCP address allocation ································································································································· 28

Allocation mechanisms ···························································································································· 28

IP address allocation process ·················································································································· 29

IP address lease extension ······················································································································ 29

DHCP message format ···································································································································· 30

DHCP options ·················································································································································· 31

Common DHCP options ··························································································································· 31

Custom DHCP options ····························································································································· 31

Protocols and standards ·································································································································· 33

Configuring the DHCP server ······································································ 34

Overview ·························································································································································· 34

DHCP address pool ································································································································· 34

IP address allocation sequence ··············································································································· 36

DHCP server configuration task list ················································································································· 36

Configuring an address pool on the DHCP server ··························································································· 37

Configuration task list ······························································································································· 37

Creating a DHCP address pool ················································································································ 37

Specifying IP address ranges for a DHCP address pool ········································································· 37

Specifying gateways for DHCP clients ····································································································· 40

Specifying a domain name suffix for DHCP clients ·················································································· 41

Specifying DNS servers for DHCP clients ································································································ 41

Specifying WINS servers and NetBIOS node type for DHCP clients ······················································· 42

Specifying BIMS server for DHCP clients ································································································ 42

Specifying the configuration file for DHCP client auto-configuration ························································ 43

Specifying a server for DHCP clients ······································································································· 43

Configuring Option 184 parameters for DHCP clients ············································································· 44

Customizing DHCP options ······················································································································ 44

Configuring the DHCP user class whitelist ······························································································· 46

Enabling DHCP ················································································································································ 46

Enabling the DHCP server on an interface ······································································································ 47

Applying an address pool on an interface ········································································································ 47

Configuring a DHCP policy for dynamic address assignment ········································································· 47

Configuring IP address conflict detection ········································································································· 48

Enabling handling of Option 82 ························································································································ 49

Configuring the DHCP server security features ······························································································· 49

Restrictions and guidelines ······················································································································ 49

Configuring DHCP flood attack protection ······························································································· 49

Configuring DHCP starvation attack protection ························································································ 50

Configuring DHCP server compatibility ············································································································ 51

Configuring the DHCP server to broadcast all responses········································································ 51

Configure the DHCP server to ignore BOOTP requests ·········································································· 51

Configuring the DHCP server to send BOOTP responses in RFC 1048 format ······································ 51

Setting the DSCP value for DHCP packets sent by the DHCP server ····························································· 52

Configuring DHCP binding auto backup ·········································································································· 52

Configuring address pool usage alarming ······································································································· 53

Binding gateways to DHCP server's MAC address ························································································· 53

Advertising subnets assigned to clients ··········································································································· 54

Applying a DHCP address pool to a VPN instance ·························································································· 54

Enabling client offline detection on the DHCP server ······················································································ 55

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