RE: DHCP Manual Bindings

        Marko and Tyson are absolutely correct here.

        To add a bit to the message on how to approach this situation if you aren't sure why client ID or any other parameters aren't leading to a correct DHCP assignment, the debug for DHCP is quite talkative and usually answers any question within a minute. I have found it very useful during troubleshooting DHCP issues for many occasions.

Cheers,

Adel Abouchaev, CCIE# 12037, CISSP, MCSE

Technical Support Engineer
Netmasterclass LLC, Cisco Learning Partner
RFC821: adel_at_netmasterclass.net
E.164: +18886772669
HTTP: www.netmasterclass.net

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Marko Milivojevic
Sent: Wednesday, November 17, 2010 8:10 AM
To: Tyson Scott
Cc: Steven Blasiol; Cisco certification
Subject: Re: DHCP Manual Bindings

Just to follow-up on Tyson's reply. This will probably work if you set
"ip address dhcl client-identifier Fa0/0" on R1. If not, after certain
IOS release (12.4somethingortheother) client identifier option is set
to something else (see previous discussion on OSL for details).

When you set the client-identifier option to be derived from the
interface MAC address, it will still not be the MAC address alone. The
MAC address will be prefixed by media type, which for Ethernet is "01.
Therefore, your client-id becomes 01<MAC_ADDRESS>". You need to move
the dot around a bit.

For MAC address c002.0594.0000, client identifier becomes
01c0.0205.9400.00 -> just as Tyson wrote below.

--
Marko Milivojevic - CCIE #18427
Senior Technical Instructor - IPexpert
FREE CCIE training: http://bit.ly/vLecture
Mailto: markom_at_ipexpert.com
Telephone: +1.810.326.1444
Web: http://www.ipexpert.com/
On Wed, Nov 17, 2010 at 00:22, Tyson Scott <tscott_at_ipexpert.com> wrote:
> That is because that will never be your client-identifier.
>
> ip dhcp pool LABMANUAL
> B  host 10.0.12.77 255.255.255.0
> B  client-identifier 01c0.0205.9400.00
>
> When you get the IP address you should be able to notice in the output of
> "show ip dhcp bind" what the client identifier is showing up for when it
> isn't working for you.
>
> Please let me know if this doesn't work for you. B If it doesn't work please
> provide the output of "show ip dhcp bind"
>
> Regards,
>
> Tyson Scott - CCIE #13513 R&S, Security, and SP
> Managing Partner / Sr. Instructor - IPexpert, Inc.
> Mailto: tscott_at_ipexpert.com
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Steven Blasiol
> Sent: Tuesday, November 16, 2010 7:10 PM
> To: Cisco certification
> Subject: DHCP Manual Bindings
>
> I am having some problems in GNS3 setting manual ip address bindings. B Here
> are the relevant configs:
>
> (DHCP Client)R1 Fa0/0-------------------Fa0/0R2 (DHCP Server)
>
> Router1
>
> interface FastEthernet0/0
> ip address dhcp client-id FastEthernet0/0 hostname CCIELAB
> duplex auto
> speed auto
>
>
> Router2
>
> no ip dhcp conflict logging
> !
> ip dhcp excluded-address 10.0.12.1 10.0.12.50
> !
> ip dhcp pool LABMANUAL
> B  host 10.0.12.77 255.255.255.0
> B  client-identifier c002.0594.0000 (MAC of R1 Fa0/0)
> B  client-name CCIELAB
> !
> ip dhcp pool LABDYNAMIC
> B  network 10.0.12.0 255.255.255.0
> B  domain-name ccie.com
> B  default-router 10.0.12.1
>
>
> When I have it configured like this I keep getting an address from the
> LABDYNAMIC pool. B I thought maybe you could have two pools so I removed the
> DYNAMIC pool and I just don't get an address.
>
> i am obviously missing something and the documentation i have found so far
> is not really helpful.
>
> Thanks in advance.
> --
> Steven M. Blasiol
>
>
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