From: simon hart (simon@harttel.com)
Date: Sun Oct 09 2005 - 10:12:50 GMT-3
On R2 try the following
ip helper-address 10.10.10.5
With this command R2 becomes a DHCP relay.
This should now let you broadcast your BOOTP packets onto the ethernet
connecting to R5, and thus retrieve an address from the dhcp-server
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Javier Tomi
Sent: 09 October 2005 13:47
Cc: Cisco certification
Subject: Re: PPP negotiated address...
Yes, I have done a "debug ip dhcp server packet" and "debug ip dhcp
server event" on the server but I get no messages at all. Also "show ip
dhcp server statistics" show no exchange of DHCP packets.
It seems that the server is nor receiving any request at all, but
connectivity is OK, so I guess that R2 is not sending the request at all.
Chris Lewis wrote:
>Have you done a debug on the DHCP server to see if the DHCP packet has
received all the help it needs in order to get there? If so, what did the
DHCP server decide to do with it?
>
>Chris
>
>Javier Tomi <fjtm@tid.es> wrote:
>Indeed I did it (look and "ip dhcp-server 10.10.10.5" command in my R2
>config...). Anyway thank you for your response.
>
>Any other ideas?
>
>kevin gannon wrote:
>
>
>
>>Javier
>>I dont have a router in front of me to test but I would guess if the pool
is
>>on a remote server you will have to give the router a hint on what DHCP
>>server to use. Dont want it broadcasting out all interfaces. I would
>>try adding "ip dhcp-server "
>>
>>There is also an example of this type of config at:
>>
>>http://www.cisco.com/en/US/tech/tk801/tk36/technologies_configuration_exam
ple09186a00800f66b9.shtml
>>
>>Regards
>>Kevin
>>
>>On 10/9/05, Javier Tomi wrote:
>>
>>
>>
>>
>>>Hi all
>>>
>>>I am trying to configure PPP over ISDN to get the IP from a DHCP server.
>>>This are my configs:
>>>
>>>On R1...
>>>
>>>interface Dialer1
>>>ip address negotiated
>>>encapsulation ppp
>>>dialer pool 1
>>>dialer idle-timeout 0
>>>dialer string 5552026
>>>dialer persistent
>>>end
>>>
>>>On R2...
>>>
>>>interface Dialer1
>>>ip address 1.1.1.2 255.255.255.0
>>>encapsulation ppp
>>>dialer pool 1
>>>dialer string 5552024
>>>peer default ip address dhcp
>>>end
>>>
>>>ip dhcp-server 10.10.10.5
>>>
>>>On R5 (directly connected to R2 through Ethernet segment):
>>>
>>>no ip dhcp conflict logging
>>>ip dhcp excluded-address 1.1.1.2
>>>!
>>>ip dhcp pool ISDN
>>>network 1.1.1.0 255.255.255.0
>>>!
>>>
>>>By some reason It is not working. R1 does not get and IP address, and
>>>"show ip dhcp server statistics" does not reveal any dhcp packet
>>>exchange. Any thoughts? I guess I missing something, but I don't know
>>>what...
>>>
>>>Thank you in advance
>>>
>>>Javi
>>>
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>>>
>>>
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