ippool behavior

[Peter Manckok]

Hy all :-)

I am introducing in the RADIUS (and FreeRadius) world
since two months ago. And now I am doing tests trying
to understand all the possibilities offered by
FreeRadius (congratulations to all the community, I am
really impressed).

Now, I am testing the rlm_ippool module. I have been
looking for documentation about this module, but I
have only found information in the radiusd.conf file
and in some posts in the forum so excuse me if my
nexts questions are stupid or yet answered.
------------
Well, my configuration is:


* In radiusd.conf I have:
....
modules {
...
  ippool main_pool {
                range-start = 192.168.1.1
                range-stop = 192.168.3.254
                netmask = 255.255.255.0
                cache-size = 800
                session-db = ${raddbdir}/db.ippool
                ip-index = ${raddbdir}/db.ipindex
                override = no
                maximum-timeout = 0
   }
...
}
...
accounting {
        detail
        unix
        radutmp
        main_pool
}
...
post-auth {
        main_pool
...
}



* In users file I have:
DEFAULT Auth-Type := Accept, Pool-Name := "main_pool" 
        Service-Type = Framed-User,
        Framed-Protocol = PPP



* I use the radclient utility to test the mod
$ radclient -f Attributes localhost auth testing
Received response ID 42, code 2, length = 44
        Service-Type = Framed-User
        Framed-Protocol = PPP
        Framed-IP-Address = 192.168.3.181
        Framed-IP-Netmask = 255.255.255.0

And in the Attributes file I have:
User-Name = "telemati"
User-Password = "telemati"
NAS-IP-Address = aa.bb.cc.dd
NAS-Port = 55


My debugs are:
modcall: entering group post-auth for request 0
rlm_ippool: Searching for an entry for nas/port:
aa.bb.cc.dd/55
rlm_ippool: Allocating ip to nas/port: aa.bb.cc.dd/55
rlm_ippool: num: 1
rlm_ippool: Allocated ip 192.168.3.181 to client on
nas aa.bb.cc.dd,port 55
modcall[post-auth]: module "main_pool" returns ok for
request 0
modcall: group post-auth returns ok for request 0
Sending Access-Accept of id 42 to 127.0.0.1:35183
     Service-Type = Framed-User
     Framed-Protocol = PPP
     Framed-IP-Address = 192.168.3.181
     Framed-IP-Netmask = 255.255.255.0
--------------


Well, my questions are:

1) Is this a correct behavior?
2) The FreeRadius assigns the IP 192.168.3.181. Why
does not it start assigning the IP 192.168.1.1?
3) If I send another Access-Request packet with a
different NAS-Port attribute, I observe that
FreeRadius assigns an IP that is not consecutive with
regard to the previous IP. Is this a correct behavior
or am I doing something wrong?
4) Which is the consequence of deleting the db.ippool
and db.ipindex files?
5) How does the rlm_ippool module free the IP address
assigned?


Sorry about the large of the mail (and my poor
english)

Regards,
Peter



		
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