(RADIATOR) Re: DefaultLeasePeriod

[Hugh Irvine]

Hello Claudio, Hello Ingvar -

As mentioned in my previous mail, DHCP as a protocol uses UDP, which 
assumes that you already have a properly configured and operating IP 
stack in place. This is obviously not the case in most cases when 
Radiator is handling an access request for PPP for example, because the 
result of the radius authentication will result in the link being set up.

As Ingvar already knows, we have implemented the AuthBy 
DYNADDRESS/AddressAllocator DHCP combination to allow a DHCP server to 
be used for address allocation in response to a radius request.

If as Claudio describes, you are wanting to do DHCP over an already 
established link, then you can use DHCP request forwarding using Cisco's 
selective forwarding configuration.

regards

Hugh



On Tuesday, August 20, 2002, at 02:08 AM, Claudio Lapidus wrote:

> Hello Ingvar,
>
> I think perhaps it will depend heavily on the capabilities of the NAS 
> itself to do such a thing. If you are talking Cisco here, the NAS has 
> all the same capabilities as a standard router. At least I can recall a 
> setup we did once in the past where we allowed DHCP broadcast queries 
> to "leak" from one LAN across a serial link and on the other side, to 
> the DHCP server. There was a command named 'ip helper address' I think, 
> don't recall very well, though. Perhaps this is a starting point for 
> your quest :)  Now, if you are talking about other NAS brands here, I 
> won't be able to help.
>
> regards,
> cl.
>
>
>> From: "Ingvar Berg (EAB)" <Ingvar.Berg at era.ericsson.se>
>> To: radiator at open.com.au
>> Subject: RE: (RADIATOR) Re: DefaultLeasePeriod
>> Date: Mon, 19 Aug 2002 16:18:26 +0200
>>
>> Just thought that it would be A Nice Thing, if the NAS could act as a 
>> DHCP relay, and leave it to the client and the DHCP server to do this 
>> the standard way. (A Nice Thing usually exists already, and can be 
>> found, you just have to know where to search ;-).
>>
>> /Ingvar
>>
>> > -----Original Message-----
>> > From: Hugh Irvine [mailto:hugh at open.com.au]
>> >
>> > Hello Ingvar -
>> >
>> > No I have never seen such a thing.
>> >
>> > This is because the end client device must start a session
>> > (usually PPP)
>> > *before* it can send TCP/UDP packets.
>> >
>> > regards
>> >
>> > Hugh
>> >
>> >
>> > On Monday, August 19, 2002, at 11:41 PM, Ingvar Berg (EAB) wrote:
>> >
>> > > Does anyone know how to set up clients, NAS etc to make the
>> > client use
>> > > a DHCP server at the ISP? Is it as simple as doing a normal DHCP
>> > > configuration in the client, and then set up your DHCP
>> > server? Or do
>> > > you have to configure the NAS as well? Because such a setup
>> > would allow
>> > > the client to renew its own IP address according to the lease time
>> > > configured in the DHCP server.
>> > >
>> > > /Ingvar
>> > >
>> > >>  -----Original Message-----
>> > >> From: 	aitayemi at metrong.com [mailto:aitayemi at metrong.com]
>> > >>
>> > >> Hi Hugh,
>> > >>
>> > >> One, I assume the checkattribute ( Service-Type =
>> > >> Framed-User,Time ="Al0000-2400",Simultaneous-Use = 1)
>> > >> implies "always-on 24-7-365" access for the user?
>> > >>
>> > >> My aim is to allow clients with DSL access
>> > >> (alwayson-24-7-365) to remain on without radiatior reclaiming the
>> > >> IP address allocated to them while they are still connected.
>> > >>
>> > >> What combination of attributes do you think can handle
>> > >> clients with DSL access (alwayson-24-7-365) and dial-up
>> > >> access so that the IP address is not reclaimed for the DSL
>> > >> clients while they are still connected - and still reclaim
>> > >> the IP addresses allocated to the dial-up/DSL clients when
>> > >> they disconnect by themselves from the NASes?
>> > >>
>> > >> Would setting the Defaultleaseperiod to "infinity" ( :-) or
>> > >> say a year, and leaving the LeaseReclaimInterval set to
>> > >> (say) a day handle the kind of configuration I mentioned
>> > >> above? That is, correctly reclaim the IPaddresses for clients
>> > >> when they are disconnected (by NAS, attributes, etc) and also
>> > >> not reclaim the IP addresses allocated to clients
>> > >> that are still online.
>> > >>
>> > >> Regards,
>> > >> Tunde Itayemi.
>> > >>
>> > >>
>> > >> ----- Original Message -----
>> > >> From: Hugh Irvine <mailto:hugh at open.com.au>
>> > >> To: Ayotunde Itayemi <mailto:aitayemi at metrong.com>
>> > >> Cc: radiator at open.com.au <mailto:radiator at open.com.au>
>> > >> Sent: Monday, August 19, 2002 12:31 PM
>> > >> Subject: (RADIATOR) Re: DefaultLeasePeriod
>> > >>
>> > >>
>> > >> Hello Tunde -
>> > >>
>> > >> The IP address in the address pool is marked as available
>> > >> when the DefaultLeasePeriod expires.
>> > >>
>> > >> There is no relationship between the Session-Timeout on the
>> > >> NAS and the DefaultLeasePeriod for the IP address allocation.
>> > >> You will have to manage any relationship that you wish to
>> > >> have with your configuration.
>> > >>
>> > >> regards
>> > >>
>> > >> Hugh
>> > >>
>> > >>
>> > >>
>> > >> On Monday, August 19, 2002, at 06:09 PM, Ayotunde Itayemi wrote:
>> > >>
>> > >>
>> > >>
>> > >> Hi Hugh, Hi All,
>> > >>
>> > >> What happens when the DefaultLeasePeriod  (say 86400 = 1
>> > day) expires?
>> > >> Does the user get disconnected and the IP allocated to
>> > >> him/her reclaimed?
>> > >> Or is the user (correctly) allowed to stay connected?
>> > >>
>> > >> Let's assume that the checkattribute of the clients specifies
>> > >> that he/she
>> > >> can stay on for the whole day (Service-Type =
>> > >> Framed-User,Time ="Al0000-2400",Simultaneous-Use = 1)
>> > >>
>> > >> Regards,
>> > >> Tunde I.
>> > >>
>> > >>
>> > >>
>> > >>
>> > --
>> > Radiator: the most portable, flexible and configurable RADIUS server
>> > anywhere. Available on *NIX, *BSD, Windows 95/98/2000, NT, MacOS X.
>> > -
>> > Nets: internetwork inventory and management - graphical, extensible,
>> > flexible with hardware, software, platform and database independence.
>> > >>
>> > >>
>> > > ===
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--
Radiator: the most portable, flexible and configurable RADIUS server
anywhere. Available on *NIX, *BSD, Windows 95/98/2000, NT, MacOS X.
-
Nets: internetwork inventory and management - graphical, extensible,
flexible with hardware, software, platform and database independence.

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