DHCP reservation on router

[Andy White]

Hello,

I've created a DHCP pool on a router for a remote office and it is workgin fine, I need to add some DHCP reservations now do I create separate DHCP pools for each user on does it have to be added to the current DHCP pool I have created for the office?

Pool

ip dhcp excluded-address 192.168.28.10 192.168.28.10

!

ip dhcp pool Dublin

   network 192.168.28.0 255.255.255.0

   next-server 192.168.28.8

   domain-name domain.local

   default-router 192.168.28.1

   dns-server 192.168.28.10

Reservation

ip dhcp pool Test_User

host 10.20.30.100

hardware-address aaaa.bbbb.cccc

client-name Test_User

Thanks

[cadet alain]

Hi,

each reservation is one separate pool. take care about hardware-address command because it will only work if the client-identifier is the MAC address otherwise you should use client-identifier command instead. To verify just use sh ip dhcp binding to see the client-identifier used by the clients getting a dynamic IP.

You can also use this feature if available instead of creating the hosts pools manually:http://www.cisco.com/en/US/docs/ios-xml/ios/ipaddr_dhcp/configuration/12-4t/config-dhcp-server.html#GUID-BF29D8F0-2449-42F9-BEFC-76929001FBA5

Regards

Alain

Don't forget to rate helpful posts.

[Andy White]

Hi,

I seem to be having trouble with this one.

I've added:

ip dhcp pool Test_User

host 10.20.30.100

hardware-address 782b.cbac.3152

client-name Test_User

And the user connected and got an IP of 192.168.28.2 in the bindings table it has an extended mac address:

782b.cbac.3152.80

Why is the mac address this long?  an ipconfig /all shows it is

782b.cbac.3152.

Thanks

[cadet alain]

Hi,

It should be either the MAC address or the MAC prefixed with 01 but not the MAC sufixed with 80, that's weird

Anyway just use the client-identifier 782b.cbac.3152.80 in your host pool instead of hardware-address.

don't forget tho clear the dynamic binding first with clear ip dhcp binding 192.168.28.2 before configuring the pool

Regards

Alain

Don't forget to rate helpful posts.