/*
by: Li Feng Shen
date: 10:04 2008-3-28
*/
Router(config)# ip dhcp excluded-address 10.1.1.1 10.1.1.19
Router(config)# ip dhcp pool Marketing_Subnet
Router(dhcp-config)# network 10.1.1.0 /24
Router(dhcp-config)# domain-name hughr.org
Router(dhcp-config)# dns-server 10.1.1.10 10.1.1.11
Router(dhcp-config)# default-router 10.1.1.2
Router(dhcp-config)# import all //optional
Router(config)# ip dhcp database tftp://10.1.1.50/dhcp-bindings.txt write-delay 180
Router# show ip dhcp binding
Router#
With ip helper-address x.x.x.x command, UDP ports are opened:
37 - TIME
49 - TACACS
53 - DNS
67 - DHCP-SERVER
68 - DHCP CLIENT
69 - TFTP
137 - NETBIOS NAME SERVICE
138 - NETBIOS DATAGRAM SERVICE
To custimize, you can go global config mode & type the following command:
Router(config)# no ip forward-protocol udp 37
Router(config)# no ip forward-protocol udp 137