Hi Laurent,
I think your confusion is that the appropriate debug here is "debug ip dhcp
server packet" instead of "debug ip dhcp server event"
Here's an example on how I would do it.
R1 initial config
hostname R1
ip dhcp pool R2
network 10.1.12.0 255.255.255.0
interface FastEthernet0/0
ip address 10.1.12.1 255.255.255.0
R2 initial config
hostname R1
interface FastEthernet0/0
ip address dhcp
The pool on R1 is initially non-specific so we can verify base DHCP is
operating and to easily obtain the client id
on R1 we enable debug ip dhcp server packet and look at the DHCP
conversation
R1#deb ip dhcp server pac
R1#
*Mar 1 00:05:03.367: DHCPD: DHCPDISCOVER received from client
0063.6973.636f.2d63.3230.312e.3035.3262.2e30.3030.302d.4661.302f.30 on
interface FastEthernet0/0.
*Mar 1 00:05:03.371: DHCPD: Allocate an address without class information
(10.1.12.0)
*Mar 1 00:05:05.375: DHCPD: Sending DHCPOFFER to client
0063.6973.636f.2d63.3230.312e.3035.3262.2e30.3030.302d.4661.302f.30
(10.1.12.2).
*Mar 1 00:05:05.379: DHCPD: broadcasting BOOTREPLY to client
c201.052b.0000.
*Mar 1 00:05:05.403: DHCPD: DHCPREQUEST received from client
0063.6973.636f.2d63.3230.312e.3035.3262.2e30.3030.302d.4661.302f.30.
*Mar 1 00:05:05.407: DHCPD: No default domain to append - abort update
*Mar 1 00:05:05.407: DHCPD: Sending DHCPACK to client
0063.6973.636f.2d63.3230.312e.3035.3262.2e30.3030.302d.4661.302f.30
(10.1.12.2).
*Mar 1 00:05:05.411: DHCPD: broadcasting BOOTREPLY to client
c201.052b.0000.
R1#un all
All possible debugging has been turned off
Now we can see the quite long dhcp client identifier and can now modify the
pool on R1 to be more specific by copy and pasting it in
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#ip dhcp pool R2
R1(dhcp-config)#no network 10.1.12.0 /24
R1(dhcp-config)#host 10.1.12.2 /24
R1(dhcp-config)#client-identifier
0063.6973.636f.2d63.3230.312e.3035.3262.2e30.3030.302d.4661.302f.30
R1(dhcp-config)#end
R1#deb ip dhcp server pac
Then we can bounce R2's Fa0/0 (shut/no shut) and see if it obtains the
proper IP is allocated (you may see a DHCP Release occur but that's just R2
being a good citizen and not something we really care about right now)
*Mar 1 00:13:09.259: DHCPD: DHCPDISCOVER received from client
0063.6973.636f.2d63.3230.312e.3035.3262.2e30.3030.302d.4661.302f.30 on
interface FastEthernet0/0.
*Mar 1 00:13:09.263: DHCPD: Sending DHCPOFFER to client
0063.6973.636f.2d63.3230.312e.3035.3262.2e30.3030.302d.4661.302f.30
(10.1.12.2).
*Mar 1 00:13:09.263: DHCPD: broadcasting BOOTREPLY to client
c201.052b.0000.
*Mar 1 00:13:09.515: DHCPD: DHCPREQUEST received from client
0063.6973.636f.2d63.3230.312e.3035.3262.2e30.3030.302d.4661.302f.30.
*Mar 1 00:13:09.519: DHCPD: No default domain to append - abort update
*Mar 1 00:13:09.519: DHCPD: Sending DHCPACK to client
0063.6973.636f.2d63.3230.312e.3035.3262.2e30.3030.302d.4661.302f.30
(10.1.12.2).
*Mar 1 00:13:09.523: DHCPD: broadcasting BOOTREPLY to client
c201.052b.0000.
R1#sh ip dhcp binding
Bindings from all pools not associated with VRF:
IP address Client-ID/ Lease expiration Type
Hardware address/
User name
10.1.12.2 0063.6973.636f.2d63. Infinite Manual
3230.312e.3035.3262.
2e30.3030.302d.4661.
302f.30
Regarding why there is a prepending 01 in front of the MAC address. If you
read the comments in the IOS hints article
http://blog.ioshints.info/2007/09/assigning-server-ip-addresses-with-dhcp.htmlit
mentions it due to the recommendation in the DHCP RFC.
Cheers,
Adam
On Thu, Oct 13, 2011 at 6:39 AM, Laurent Loingeville <[email protected]>wrote:
> Hi all,
> First of all thanks to all of you for your answer. It is very nice to see a
> lot of people can help us such a way!
> Thanks to you, I made it work :) I put the "ip dhcp clien client-id fa0/0
> "in the interface subcommand of the client and put "client-id
> 01"macaddressoftheclientinterface" in th eserver side
>
> Nevertheles i got two questions? Why do we need to prefix with 01 th emac
> address of the client interface in the client-id command of the server?And
> then, why a "debug ip dhcp server event" in the server side didn't gave me
> the client-id to put ?
> Here is what i got from the debug command.So no useful to find the clinet
> id:
> *Mar 1 00:11:40.811: DHCPD: Sending notification of DISCOVER:*Mar 1
> 00:11:40.811: DHCPD: htype 1 chaddr c207.1490.0000*Mar 1 00:11:40.815:
> DHCPD: remote id 020a000096640c0200000000*Mar 1 00:11:40.815: DHCPD:
> circuit id 00000000*Mar 1 00:11:40.819: DHCPD: Seeing if there is an
> internally specified pool class:*Mar 1 00:11:40.819: DHCPD: htype 1
> chaddr c207.1490.0000*Mar 1 00:11:40.823: DHCPD: remote id
> 020a000096640c0200000000*Mar 1 00:11:40.823: DHCPD: circuit id
> 00000000*Mar 1 00:11:40.823: DHCPD: there is no address pool for
> 150.100.12.2.R2(dhcp-config)#*Mar 1 00:11:43.663: DHCPD: Sending
> notification of DISCOVER:*Mar 1 00:11:43.663: DHCPD: htype 1 chaddr
> c207.1490.0000*Mar 1 00:11:43.667: DHCPD: remote id
> 020a000096640c0200000000*Mar 1 00:11:43.667: DHCPD: circuit id
> 00000000*Mar 1 00:11:43.671: DHCPD: Seeing if there is an internally
> specified pool class:*Mar 1 00:11:43.671: DHCPD: htype 1
> chaddr c207.1490.0000*Mar 1 00:11:43.675: DHCPD: remote id
> 020a000096640c0200000000*Mar 1 00:11:43.675: DHCPD: circuit id
> 00000000*Mar 1 00:11:43.675: DHCPD: there is no address pool for
> 150.100.12.2.
>
> Regards,
> --- En date de : Mer 12.10.11, Marko Milivojevic <[email protected]> a
> écrit :
>
> De: Marko Milivojevic <[email protected]>
> Objet: Re: [OSL | CCIE_RS] Manual DHCP not working
> À: "arulgobinath emmanuel" <[email protected]>
> Cc: "Laurent Loingeville" <[email protected]>, "
> [email protected]" <[email protected]>
> Date: Mercredi 12 octobre 2011, 18h25
>
> That's exactly what I wanted you to see... By default, Cisco clients
> don't use a client-id derived from a Mac address, rather something a
> bit more involved, as Ivan pointed out in his article. It would be be
> so easy to lose points in the lab if you are not aware of this.
>
> --
> Marko Milivojevic - CCIE #18427
> Senior Technical Instructor - IPexpert
>
> FREE CCIE training: http://bit.ly/vLecture
>
> Mailto: [email protected]
> Telephone: +1.810.326.1444
> Web: http://www.ipexpert.com/
>
> On Wed, Oct 12, 2011 at 09:02, arulgobinath emmanuel <[email protected]>
> wrote:
> > mm ..
> > i think client id is the right way to go :). its easy to capture the
> packet
> > from gns3 and check the value.
> >
> > also the ip dhcp client client-id <int> is needed. otherwise we will end
> up
> > following as the client id :) in my case
> >
> 00:63:69:73:63:6f:2d:63:61:30:31:2e:30:38:64:30:2e:30:30:31:63:2d:46:61:31:2f:30
> > ,
> > Ref: http://blog.ioshints.info/2007/08/default-dhcp-client-id.html
> >
> >
> > ip dhcp pool test
> > host 192.168.1.1 255.255.255.0
> > client-identifier 01ca.0108.d000.1c
> >
> >
> > interface FastEthernet1/0
> > ip dhcp client client-id FastEthernet1/0
> > ip address dhcp
> > duplex auto
> > speed auto
> >
> > FastEthernet1/0 192.168.1.1 YES DHCP up
> >
> > regards,
> > gobinath.
> >
> > On Wed, Oct 12, 2011 at 9:23 PM, Marko Milivojevic <[email protected]>
> > wrote:
> >>
> >> Have you tried the debug I asked you to do? Try it... See what
> >> client-id is coming from the router.
> >>
> >> (I can give you the answer, but then you will not be able to
> >> troubleshoot a similar issue come the lab day)
> >>
> >> --
> >> Marko Milivojevic - CCIE #18427 (SP R&S)
> >> Senior Technical Instructor - IPexpert
> >>
> >> On Wed, Oct 12, 2011 at 00:20, Laurent Loingeville <[email protected]>
> >> wrote:
> >> > Hi,
> >> > Prefix the client-id with 01 soesn't work...:-( I am really
> desesperate
> >> > with that functionnality..
> >> >
> >> >
> >> > R1 (client)-------------> R2(dhcp server 150.100.12.2 /24)
> >> > Here is the config from the server:
> >> > interface FastEthernet0/0ip address 150.100.12.2 255.255.255.0speed
> >> > 100full-duplex
> >> > ip dhcp pool TESThost 150.100.12.1 255.255.255.0client-identifier
> >> > c207.0ad0.0000default-router 150.100.12.2
> >> >
> >> >
> >> > From the client:
> >> > int fa0/0ip add dhcp
> >> >
> >> >
> >> >
> >> > The messages from the server are:
> >> > *Mar 1 00:08:19.707: DHCPD: Sending notification of DISCOVER*Mar 1
> >> > 00:08:19.711: DHCPD: htype 1 chaddr c207.106c.0000*Mar 1
> 00:08:19.711:
> >> > DHCPD: remote id 020a000096640c0200000000*Mar 1 00:08:19.715:
> DHCPD:
> >> > circuit id 00000000*Mar 1 00:08:19.715: DHCPD: Seeing if there is an
> >> > internally specified pool class:*Mar 1 00:08:19.719: DHCPD: htype 1
> >> > chaddr c207.106c.0000*Mar 1 00:08:19.719: DHCPD: remote id
> >> > 020a000096640c0200000000*Mar 1 00:08:19.723: DHCPD: circuit id
> >> > 00000000*Mar 1 00:08:19.723: DHCPD: there is no address pool for
> >> > 150.100.12.2.R2(dhcp-config)#
> >> > --- En date de : Mar 11.10.11, arulgobinath emmanuel
> >> > <[email protected]> a écrit :
> >> >
> >> > De: arulgobinath emmanuel <[email protected]>
> >> > Objet: Re: [OSL | CCIE_RS] Manual DHCP not working
> >> > À: "Laurent Loingeville" <[email protected]>
> >> > Cc: "[email protected]" <[email protected]>
> >> > Date: Mardi 11 octobre 2011, 16h08
> >> >
> >> > HI,
> >> > . in this situation you have to use the hardware address parameter.
> >> > according to your debug msg it showing the mac-address as the client
> id.
> >> > if you are using the client id you have to prepend 01.
> >> >
> >> >
> http://blog.ioshints.info/2007/09/assigning-server-ip-addresses-with-dhcp.html
> >> >
> >> >
> >> > In the real world environment IOS static mapping will be a difficult
> >> > task wins 7 send client id, linux flavor send mac address :)
> >> >
> >> > Best Regards,
> >> > Gobinath.
> >> >
> >> >
> >> > On Tue, Oct 11, 2011 at 2:49 PM, Laurent Loingeville
> >> > <[email protected]> wrote:
> >> >
> >> > Hi,
> >> >
> >> > I tried to test manual DHCP binding with the most basic link but it is
> >> > not working.
> >> >
> >> > R1 (client)-------------> R2(dhcp server 150.100.12.2 /24)
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > Here is the config from the server:
> >> >
> >> > interface FastEthernet0/0 ip address 150.100.12.2 255.255.255.0 speed
> >> > 100 full-duplexend
> >> >
> >> > ip dhcp pool TEST host 150.100.12.1 255.255.255.0
> client-identifier
> >> > c207.0ad0.0000 default-router 150.100.12.2
> >> >
> >> >
> >> >
> >> > From the client:
> >> >
> >> > int fa0/0ip add dhcp
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > Here is th e debug log i got on the server:
> >> >
> >> > *Mar 1 00:43:59.475: DHCPD: Sending notification of DISCOVER:*Mar 1
> >> > 00:43:59.479: DHCPD: htype 1 chaddr c207.0ad0.0000*Mar 1
> 00:43:59.479:
> >> > DHCPD: remote id 020a000096640c0200000000*Mar 1 00:43:59.479:
> DHCPD:
> >> > circuit id 00000000*Mar 1 00:43:59.483: DHCPD: Seeing if there is an
> >> > internally specified pool class:*Mar 1 00:43:59.483: DHCPD: htype 1
> >> > chaddr c207.0ad0.0000*Mar 1 00:43:59.487: DHCPD: remote id
> >> > 020a000096640c0200000000*Mar 1 00:43:59.487: DHCPD: circuit id
> >> > 00000000*Mar 1 00:43:59.491: DHCPD: there is no address pool for
> >> > 150.100.12.2.R2(config)#
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > I tried with hardware address instead of client-id but nothing.Tried
> >> > clinet-id with 020a000096640c0200000000 but still nothing.I don't know
> why i
> >> > get the message "no address pool"
> >> >
> >> >
> >> >
> >> > Best regards
> >> >
> >> >
> >> >
> >> > _______________________________________________
> >> >
> >> > For more information regarding industry leading CCIE Lab training,
> >> > please visit www.ipexpert.com
> >> >
> >> >
> >> >
> >> > Are you a CCNP or CCIE and looking for a job? Check out
> >> > www.PlatinumPlacement.com
> >> >
> >> >
> >> >
> >> > _______________________________________________
> >> > For more information regarding industry leading CCIE Lab training,
> >> > please visit www.ipexpert.com
> >> >
> >> > Are you a CCNP or CCIE and looking for a job? Check out
> >> > www.PlatinumPlacement.com
> >> >
> >
> >
> _______________________________________________
> For more information regarding industry leading CCIE Lab training, please
> visit www.ipexpert.com
>
> Are you a CCNP or CCIE and looking for a job? Check out
> www.PlatinumPlacement.com
>
_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com
Are you a CCNP or CCIE and looking for a job? Check out
www.PlatinumPlacement.com
