From: manoj menon (manojmenon123@yahoo.com)
Date: Sun Oct 09 2005 - 16:56:15 GMT-3
Gents,
'ip dhcp-server' should work even if the Server is not necessary on the same subnet but several hops away...right??
Thanks,
simon hart <simon@harttel.com> wrote:
Javi,
On reflection you are right, no need for the helper-address
Simon
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Javier Tomi
Sent: 09 October 2005 16:07
Cc: Cisco certification
Subject: Re: PPP negotiated address...
Finally I got it to work after reloading R2. Not sure about what was
happening. I guess some kind of buggy behaviour. Anyway thank you all
for your help.
Simon,
I am not sure about your suggestion of using "ip helper-address" in this
config. As I understand it, R2 does not receives a DHCP discovery over
the dialer interface, but originates one on behalf of R1. Am I wrong?...
Regards
Javi
simon hart wrote:
>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 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_exa
m
>>>
>>>
>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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