Users Guide

Congure NetBIOS WINS address resolution
OS10(config)# ip dhcp server
OS10(conf-dhcp)# pool Dell
OS10(conf-dhcp-Dell)# netbios-name-server 192.168.10.5
OS10(conf-dhcp-Dell)# netbios-node-type Hybrid
Manual binding entries
Address binding is mapping between the IP address and the media access control (MAC) address of a client. The DHCP server assigns the
client an available IP address automatically and then creates an entry in the binding table. You can also manually create an entry for a client.
Manual bindings help to guarantee that a particular network device receives a particular IP address.
Consider manual bindings as single-host address pools. There is no limit to the number of manual bindings, but you can only congure one
manual binding per host. Manual binding entries do not display in the show ip dhcp binding output.
1 Create an address pool in DHCP mode.
pool name
2 Enter the client IP address in DHCP <POOL> mode.
host address
3 Enter the client hardware address in DHCP <POOL> mode.
hardware-address hardware-address
Congure manual binding
OS10(config)# ip dhcp server
OS10(conf-dhcp)# pool static
OS10(conf-dhcp-static)# host 20.1.1.2
OS10(conf-dhcp-static)# hardware-address 00:01:e8:8c:4d:0a
View DHCP binding table
OS10# show ip dhcp binding
IP Address Hardware address Lease expiration Hostname
+--------------------------------------------------------------------------
11.1.1.254 00:00:12:12:12:12 Jan 27 2016 06:23:45
Total Number of Entries in the Table = 1
DHCP relay agent
A DHCP relay agent relays DHCP messages to and from a remote DHCP server, even if the client and server are on dierent IP networks.
You can congure the IP address of the remote DHCP server.
You can congure a device either as a DHCP server or a DHCP relay agent — but not both.
Option 82 for security
DHCP, as dened by RFC 2131, provides no authentication or security mechanisms. To provide security, the DHCP relay agent supports
Option-82 with Circuit ID sub option, which is the printable name of the interface on which the client request was received.
This option secures all DHCP trac that go through a DHCP relay agent, and ensures that communication between the DHCP relay agent
and the DHCP server is not compromised.
System management
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