bind ip address with mac address issue

[aconticisco]

Hello

I am trying to bind a pc with its mac address to always obtain a particular ip address from its vlan. The pc is connected to a 2950 switch which is then connected to a 1721 router. Router has subinterfaces on ethernet 0 and each subinterface has it's own dhcp server running from the router. Please see below: ( I am trying to assign a 1.100 address but it is not working )

dslrouter(config)#ip dhcp pool dhcpgroup1
dslrouter(dhcp-config)#host ?
  A.B.C.D  IP address in dotted-decimal notation

dslrouter(dhcp-config)#host 192.168.1.100 255.255.255.0
% This command may not be used with network, origin, vrf, or relay pools.
dslrouter(dhcp-config)#hardw
dslrouter(dhcp-config)#hardware-address 0100.1966.83c0.49 eth
dslrouter(dhcp-config)#hardware-address 0100.1966.83c0.49 ethernet
% This command may not be used with network, origin, vrf, or relay pools.
dslrouter(dhcp-config)#client
dslrouter(dhcp-config)#client-nam
dslrouter(dhcp-config)#client-name aaaaa
% This command may not be used with network, origin, vrf, or relay pools.
dslrouter(dhcp-config)#
dslrouter#
*Mar  1 04:06:03.615: %SYS-5-CONFIG_I: Configured from console by consoleshow ip dhcp binding
Bindings from all pools not associated with VRF:
IP address          Client-ID/              Lease expiration        Type
                    Hardware address/
                    User name
192.168.1.11        0100.1966.83c0.49       Mar 02 2002 04:02 AM    Automatic
dslrouter#
*Mar  1 04:06:22.047: DHCPD: DHCPRELEASE message received from client 0100.1966.83c0.49 (192.168.1.11).
*Mar  1 04:06:28.799: DHCPD: DHCPDISCOVER received from client 0100.1966.83c0.49 on interface FastEthernet0.1.
*Mar  1 04:06:30.799: DHCPD: Sending DHCPOFFER to client 0100.1966.83c0.49 (192.168.1.11).
*Mar  1 04:06:30.799: DHCPD: broadcasting BOOTREPLY to client 0019.6683.c049.
*Mar  1 04:06:30.803: DHCPD: DHCPREQUEST received from client 0100.1966.83c0.49.
*Mar  1 04:06:30.803: DHCPD: Appending default domain from pool
*Mar  1 04:06:30.803: DHCPD: Using hostname 'pc-PC.home.local' for dynamic update (from FQDN option)
*Mar  1 04:06:30.807: DHCPD: Sending DHCPACK to client 0100.1966.83c0.49 (192.168.1.11).
*Mar  1 04:06:30.807: DHCPD: Including FQDN option name 'pc-PC.home.local' rcode1=0, rcode2=0 flags=0x0
*Mar  1 04:06:30.807: DHCPD: broadcasting BOOTREPLY to client 0019.6683.c049.

Thanks !

[Roman Rodichev]

use client-id command instead of hardware-address

[Latchum Naidu]

Hi,

First you need to disable dynamic arp under interface, and configure static arp entries in global config.

Use the following command under interface "Switch(config-if)#no ip arp inspection" to disable dynamic arp.
Use the following command in Globla config mode "Switch(config)#arp 10.10.10.10 aaaa.aaaa.aaaa arpa" to injects a static ARP entry into the ARP/MAC Address table.

Please click on the correct answere if this answered your question.
Regards,
Naidu.

[aconticisco]

sorry but for no ip arp inspection I got :

dslrouter(config)#no ip arp ?
  gratuitous  Gratuitous ARP control
  proxy       Global proxy ARP configuration

and this is what is happenning, I have added the 1.100 but the old one 1.11 is still in the arp table...

Internet  192.168.1.100           -   0019.6683.c049  ARPA
Internet  192.168.10.2            -   0014.f2c0.3943  ARPA   FastEthernet0.10
Internet  192.168.1.11            0   0019.6683.c049  ARPA   FastEthernet0.1
Internet  192.168.1.2             -   0014.f2c0.3943  ARPA   FastEthernet0.1
Internet  192.168.20.2            -   0014.f2c0.3943  ARPA   FastEthernet0.20

Thanks !

[Latchum Naidu]

Hi,

"no ip arp inspection" is an interface level command not global config mode as i told in my previous post.
Once you done the above try to add static arp entries as i told in my previous post.

Please rate the helpfull posts.
Regards,
Naidu.

[aconticisco]

sorry but neither on the interface:

dslrouter(config-if)#no ip ar?
% Unrecognized command

any idea pls ?

[cadet alain]

Hi,

do a show ip dhcp pool and post  output. Manual bindings must be configured in child pools and  then  replace hardware-address by client-identifier like Roman told above.

Regards.

Alain.

[aconticisco]

dslrouter#show ip dhcp pool
*Mar  1 03:45:08.891: %SYS-5-CONFIG_I: Configured from console by console

Pool dhcpgroup1 :
Utilization mark (high/low)    : 100 / 0
Subnet size (first/next)       : 0 / 0
Total addresses                : 254
Leased addresses               : 1
Pending event                  : none
1 subnet is currently in the pool :
Current index        IP address range                    Leased addresses
192.168.1.1          192.168.1.1      - 192.168.1.254     1

Pool vlan10-Pool :
Utilization mark (high/low)    : 100 / 0
Subnet size (first/next)       : 0 / 0
Total addresses                : 254
Leased addresses               : 0
Pending event                  : none
1 subnet is currently in the pool :
Current index        IP address range                    Leased addresses
192.168.10.1         192.168.10.1     - 192.168.10.254    0

Pool vlan20-pool :
Utilization mark (high/low)    : 100 / 0
Subnet size (first/next)       : 0 / 0
Total addresses                : 254
Leased addresses               : 0
Pending event                  : none
1 subnet is currently in the pool :
Current index        IP address range                    Leased addresses
192.168.20.1         192.168.20.1     - 192.168.20.254    0

[cadet alain]

ok that's what I thought, you were trying to do a manual binding inside a network pool which already existed.

You'll have to create a new pool to do the binding and don't forget to change hardware-address by client-identifier if you use the mac address prefixed with 01.

Regards.

Alain.

[aconticisco]

Does this mean that each time I have to create a binding I do have to re-create the pool ?

The mac address starts with 00 so in this case do I have to use hardware-address  ?

Thanks !

[cadet alain]

Does this mean that each time I have to create a binding I do have to re-create the pool ?

Not re-create but create a different one which will always be a child pool with the network pool being the parent.

When you issue a dynamic lease you can see in the output of sh ip dhcp binding how the client identified itself: with its mac address(12 chars) or with a client-id( 14 chars= prefix( 2 chars = 01 for ethernet)+ 12 chars of mac address).

in the former case use hardware-address followed by mac address and in the latter use client-identifier followed by client-id.

Regards.

Alain.

[aconticisco]

Alain,

I created another pool and gave it a name of child pool, in it I specified the client-identifier and invented a client-name and it worked. Is this the correct way to the bindings

Thanks !

[cadet alain · Accepted solution]

Hi,

not mandatory to specify client name but each pool for a manual binding will have a different name.

When I talked about parent/child I meant that there must exist a network pool before creating a pool for a manual binding and the ip address must be  in the network of the network pool.

Regards.

Alain.

[aconticisco]

Hello,

I set up both pools on another router and the ip address is being leased from the first pool only

The second pool consists of a subnet of the first pool and in it I specified the host ip and client id.

1st pool covers 1 - 254

2nd pool covers 240 - 254

the 2nd pool is supposed to be for reservations bindings with mac only however ip is being leased from the 1st pool

any ideas pls

[Kuldeep singh]

Hi Cadet,

You mean to say that, If we want to reserve MAC address with ip address from DHCP pool then we require two DHCP pool.

But why ? Why we can not do MAC reservation with ip address from only one DHCP pool.

Please Tell