Re: DHCP Manual Bindings

Hi

Just read it up, the hardware address only works for clients that do not
send a client identifier in the packet.

Thanks

On Wed, Nov 17, 2010 at 9:09 PM, Marko Milivojevic <markom_at_ipexpert.com>wrote:

> I know how, but I didn't want to sound like a smartypants ;-). You
> were trying to assign 1st address - which will be assigned 1st from
> the pool anyway.
>
> So... the question stands - what does hardware-address do, if
> anything? Not to mention it has options to specify media type. None of
> that ever 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
> Web: http://www.ipexpert.com/
>
> On Wed, Nov 17, 2010 at 19:00, Jose Orfao <jmorfao_at_gmail.com> wrote:
> > Hi Marko
> >
> > Apologies, just tried it again, and it got an IP from the pool and not
> the
> > reserved one.
> > Not sure how I thought it was working awhile ago.
> >
> > But I know that we should be using the client-ID.
> >
> > Thanks
> >
> > Jose
> >
> > On Wed, Nov 17, 2010 at 8:16 PM, Marko Milivojevic <markom_at_ipexpert.com>
> > wrote:
> >>
> >> 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
> >> Web: http://www.ipexpert.com/
> >>
> >> 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
> >> > network 10.1.1.0 255.255.255.0
> >> > default-router 10.1.1.2
> >> > !
> >> > ip dhcp pool R1
> >> > host 10.1.1.1 255.255.255.0
> >> > 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 Marko and Tyson are absolutely correct here.
> >> >> >> >
> >> >> >> > 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
> >> >> >> >>
> >> >> >> >>
> >> >> >> >> Blogs and organic groups at http://www.ccie.net
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
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> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
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> >> >> >> >
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Received on Wed Nov 17 2010 - 21:13:14 ART