From: Javier Tomé (fjtm@tid.es)
Date: Mon Oct 10 2005 - 01:46:16 GMT-3
Yes, the server needs not to be directly connected.
manoj menon wrote:
>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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>>>>
>>>>
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