Re: DHCP Manual Bindings

I would prefer this to continue on the mailing list...

That has *never* worked for me.

--
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
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On Wed, Nov 17, 2010 at 18:14, Jose Orfao <jmorfao_at_gmail.com> wrote:
> Yes thats is correct, maybe I explained incorrectly.
> eg.
>
> !
> ip dhcp pool TEST
> B B  network 10.1.1.0 255.255.255.0
> B B  default-router 10.1.1.2
> !
> ip dhcp pool R1
> B B  host 10.1.1.1 255.255.255.0
> B B  hardware-address c20b.0fa8.0000
> !
>
> thanks
>
>
> On Wed, Nov 17, 2010 at 8:11 PM, Marko Milivojevic <markom_at_ipexpert.com>
> wrote:
>>
>> I was referring to the specific command "hardware-address" :-)
>>
>> --
>> 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 18:08, Jose Orfao <jmorfao_at_gmail.com> wrote:
>> > Hi Marko
>> >
>> > It does work have used it before it preparing for lab (in a seperate
>> > pool),
>> > the client-id I get it from the client router running a debug dhcp
>> > detail
>> > which gives me the id that consists of "null cisco mac fa0/0" ;also
>> > works.
>> > thanks.
>> >
>> > Jose Orfao
>> >
>> >
>> > On Wed, Nov 17, 2010 at 7:58 PM, Marko Milivojevic <markom_at_ipexpert.com>
>> > wrote:
>> >>
>> >> Absolutely correct. Running "debug ip dhcp server events" on the
>> >> server will answer all doubts as to what the client identifier value
>> >> you are dealing with.
>> >>
>> >> That said... I have one DHCP question. Does anyone know a
>> >> scenario/situation when using "hardware-address" inside host pool
>> >> actually does anything?
>> >>
>> >> --
>> >> 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 17:29, Adel Abouchaev <adel_at_netmasterclass.net>
>> >> wrote:
>> >> > B B B B B B B Marko and Tyson are absolutely correct here.
>> >> >
>> >> > B B B B B B B 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 B host 10.0.12.77 255.255.255.0
>> >> >> B 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 B host 10.0.12.77 255.255.255.0
>> >> >> B B client-identifier c002.0594.0000 (MAC of R1 Fa0/0)
>> >> >> B B client-name CCIELAB
>> >> >> !
>> >> >> ip dhcp pool LABDYNAMIC
>> >> >> B B network 10.0.12.0 255.255.255.0
>> >> >> B B domain-name ccie.com
>> >> >> B 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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>> >> >>
>> >> >>
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