Restrictions for Configuring Internal DHCP Server
You can configure up to 16 internal DHCP servers.
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You can configure up to 16 internal DHCP servers.
have built-in DHCP relay agents. However, when you desire network segments that do not have a separate DHCP server, the can have built-in internal DHCP server that assign IP addresses and subnet masks to wireless clients. Typically, one can have one or more internal DHCP server that each provide a range of IP addresses.
Internal DHCP server are needed for internal DHCP to work. Once DHCP is defined on the , you can then point the primary DHCP server IP address on the management, AP-manager, and dynamic interfaces to the ’s management interface.
Note |
The controller has the ability to provide internal DHCP server. This feature is very limited and considered as convenience that is often used simple demonstration or proof-of-concept, for example in a lab environment. The best practice is NOT to use this feature in an enterprise production network. Read more about this at: http://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/110865-dhcp-wlc.html#anc16 |
This section contains the following subsections:
Step 1 |
Choose Controller > Internal DHCP Server > DHCP Scope to open the DHCP Scopes page. This page lists any DHCP scopes that have already been configured.
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Step 2 |
Click New to add a new DHCP scope. The DHCP Scope > New page appears. |
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Step 3 |
In the Scope Name text box, enter a name for the new DHCP scope. |
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Step 4 |
Click Apply. When the DHCP Scopes page reappears, click the name of the new scope. The DHCP Scope > Edit page appears. |
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Step 5 |
In the Pool Start Address text box, enter the starting IP address in the range assigned to the clients.
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Step 6 |
In the Pool End Address text box, enter the ending IP address in the range assigned to the clients.
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Step 7 |
In the Network text box, enter the network served by this DHCP scope. This IP address is used by the management interface with Netmask applied, as configured on the Interfaces page. |
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Step 8 |
In the Netmask text box, enter the subnet mask assigned to all wireless clients. |
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Step 9 |
In the Lease Time text box, enter the amount of time (from 0 to 65536 seconds) that an IP address is granted to a client. |
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Step 10 |
In the Default Routers text box, enter the IP address of the optional router connecting the controllers. Each router must include a DHCP forwarding agent, which allows a single controller to serve the clients of multiple controllers. |
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Step 11 |
In the DNS Domain Name text box, enter the optional domain name system (DNS) domain name of this DHCP scope for use with one or more DNS servers. |
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Step 12 |
In the DNS Servers text box, enter the IP address of the optional DNS server. Each DNS server must be able to update a client’s DNS entry to match the IP address assigned by this DHCP scope. |
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Step 13 |
In the Netbios Name Servers text box, enter the IP address of the optional Microsoft Network Basic Input Output System (NetBIOS) name server, such as the Internet Naming Service (WINS) server. |
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Step 14 |
From the Status drop-down list, choose Enabled to enable this DHCP scope or choose Disabled to disable it. |
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Step 15 |
Save the configuration. |
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Step 16 |
Choose DHCP Allocated Leases to see the remaining lease time for wireless clients. The DHCP Allocated Lease page appears, showing the MAC address, IP address, and remaining lease time for the wireless clients. |
Step 1 |
Create a new DHCP scope by entering this command: config dhcp create-scope scope
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Step 2 |
Specify the starting and ending IP address in the range assigned to the clients by entering this command: config dhcp address-pool scope start end
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Step 3 |
Specify the network served by this DHCP scope (the IP address used by the management interface with the Netmask applied) and the subnet mask assigned to all wireless clients by entering this command: config dhcp network scope network netmask |
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Step 4 |
Specify the amount of time (from 0 to 65536 seconds) that an IP address is granted to a client by entering this command: config dhcp lease scope lease_duration |
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Step 5 |
Specify the IP address of the optional router connecting the controllers by entering this command: config dhcp default-router scope router_1 [router_2] [router_3] Each router must include a DHCP forwarding agent, which allows a single controller to serve the clients of multiple controllers. |
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Step 6 |
Specify the optional domain name system (DNS) domain name of this DHCP scope for use with one or more DNS servers by entering this command: config dhcp domain scope domain |
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Step 7 |
Specify the IP address of the optional DNS server(s) by entering this command: config dhcp dns-servers scope dns1 [dns2] [dns3] Each DNS server must be able to update a client’s DNS entry to match the IP address assigned by this DHCP scope |
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Step 8 |
Specify the IP address of the optional Microsoft Network Basic Input Output System (NetBIOS) name server, such as the Internet Naming Service (WINS) server by entering this command: config dhcp netbios-name-server scope wins1 [wins2] [wins3] |
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Step 9 |
Enable or disable this DHCP scope by entering this command: config dhcp {enable | disable} scope |
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Step 10 |
Save your changes by entering this command: save config |
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Step 11 |
See the list of configured DHCP scopes by entering this command: show dhcp summary Information similar to the following appears:
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Step 12 |
Display the DHCP information for a particular scope by entering this command: show dhcp scope Information similar to the following appears:
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