Difference between revisions of "Cisco DHCP configuration"
| Line 33: | Line 33: | ||
host 10.0.99.1 255.255.255.128 | host 10.0.99.1 255.255.255.128 | ||
client-identifier 017c.69f6.e1d8.7d | client-identifier 017c.69f6.e1d8.7d | ||
client-name ap1 | ! client-name does not work for me assigning the hostnaem to a client/AP | ||
client-name ap1 | |||
If you configure a Cisco router as a DHCP client, you'll notice that it uses weird client-id in its DHCP requests (assuming you care about client IDs on the DHCP server). Instead of using the interface MAC address as the client ID (as most workstations do), the client ID is the string 'cisco-dotted.mac.ascii-ifname' where the dotted.mac.ascii is the interface MAC address in ascii and the ifname is the short interface name. | |||
debug dhcp detail | |||
ote that if you have <tt>client-id cc05.12bc.0000</tt> on your client ; on your server, you need to use <tt>client-id 01cc.0512.bc00.00</tt>. So there's a 01 prefix to add on the server where 01 represents the Ethernet media type. | |||
[[Category:cisco]] | [[Category:cisco]] | ||
Revision as of 01:04, 22 October 2013
This configuration will be applied to Cisco 1941 with EHWIC-3G-HSPA+7 card and Light Weigh Access Point.
Basic DHCP config
- Configure Cisco router as DHCP SERVER
configure terminal service dhcp ip dhcp pool LMA-POOL network 192.168.100.0 255.255.255.0 default-router 192.168.100.254 dns-server 192.168.100.254 8.8.8.8 domain-name lma.gateway lease 0 8 '<--- 8 hrs lease -- number represents: Days Hours Minutes ---' ip dhcp excluded-address 192.168.100.1 192.168.100.10 ip dhcp excluded-address 192.168.100.240 192.168.100.255
- Cisco router interface configured to obtain an IP Address from DHCP server
configure terminal r1-basic(config)#int gi 0/0 r1-basic(config-if)#ip address dhcp r1-basic(config-if)#no shutdown r1-basic(config-if)#end
once ip is assigned you will see
*Sep 1 22:08:50.003: %DHCP-6-ADDRESS_ASSIGN: Interface GigabitEthernet0/0 assigned DHCP address 192.168.1.66, mask 255.255.255.0, hostname r1-basicchanged state to up
- Clear DHCP binding will clear the current assignment then resetting a client interface will trigger to re negotiate IP address
R1#clear ip dhcp binding ? * Clear all automatic bindings A.B.C.D Clear a specific binding vrf DHCP vrf bindings
DHCP IP bindings
ip dhcp pool AP1 host 10.0.99.1 255.255.255.128 client-identifier 017c.69f6.e1d8.7d ! client-name does not work for me assigning the hostnaem to a client/AP client-name ap1
If you configure a Cisco router as a DHCP client, you'll notice that it uses weird client-id in its DHCP requests (assuming you care about client IDs on the DHCP server). Instead of using the interface MAC address as the client ID (as most workstations do), the client ID is the string 'cisco-dotted.mac.ascii-ifname' where the dotted.mac.ascii is the interface MAC address in ascii and the ifname is the short interface name.
debug dhcp detail
ote that if you have client-id cc05.12bc.0000 on your client ; on your server, you need to use client-id 01cc.0512.bc00.00. So there's a 01 prefix to add on the server where 01 represents the Ethernet media type.