Freeradius not releasing IPs from pool

[Angel L. Mateo]

Hello,

	I have a problem with my pools in freeradius. The problems is that it 
is not releasing IPs from the pools. At least, not all of them, so after 
a while my users can't connect because the pool is full.

	I check that it is not releasing IPs because I get (I have replaced 
usernames with XXXX):

root at vulpes21:/usr/share/doc/freeradius# radwho | grep 155.54.194
XXXXXXXX XXXXXXXXX   PPP   >999 Wed 10:28 155.54.213.20   155.54.194.128
XXXXXXXX XXXXXXXXX   PPP   >999 Wed 10:36 155.54.213.20   155.54.194.51
XXXXXXXX XXXXXXXXX   PPP   >999 Wed 10:42 155.54.213.20   155.54.194.8
XXXXXXXX XXXXXXXXX   PPP   >999 Wed 12:33 155.54.213.20   155.54.194.115
XXXXXXXX XXXXXXXXX   PPP   >999 Wed 12:37 155.54.213.20   155.54.194.101
XXXXXXXX XXXXXXXXX   PPP   >999 Wed 12:40 155.54.213.20   155.54.194.62
XXXXXXXX XXXXXXXXX   PPP   >999 Wed 13:06 155.54.213.20   155.54.194.92
XXXXXXXX XXXXXXXXX   PPP   >999 Wed 13:11 155.54.213.20   155.54.194.48
XXXXXXXX XXXXXXXXX   PPP   >999 Wed 13:24 155.54.213.20   155.54.194.78
XXXXXXXX XXXXXXXXX   PPP   >999 Wed 13:27 155.54.213.20   155.54.194.112
XXXXXXXX XXXXXXXXX   PPP   >999 Wed 13:28 155.54.213.20   155.54.194.59
XXXXXXXX XXXXXXXXX   PPP   >999 Wed 13:29 155.54.213.20   155.54.194.134

	but rlm_ippol_tool shows a lot of IP addresses in use:

root at vulpes21:/etc/freeradius# rlm_ippool_tool -a pool_vpn.ippool 
pool_vpn.ipindex  | wc -l
122

	In my configuration I have:

authorize {
         vpn_log
         vpn_syslog
         suffix
         files_vpn
         pap
}

authenticate {
         Auth-Type PAP {
                 pap
         }
         Auth-Type LDAP {
                 ldap-email
         }
}

preacct {
         suffix
         files_vpn
}

accounting {
         vpn_log
         unix
         pool_vpn
         pool_vpn_alu
         pool_vpn_ryt
         radutmp
         vpn_acc_syslog
         sql_log_um
}

session { }

post-auth {
         pool_vpn
         pool_vpn_alu
         pool_vpn_ryt
         vpn_log
         vpn_syslog
}

pre-proxy { }

post-proxy { }

	Any idea?

	Ah... I'm running 2.1.8 from ubuntu 10.04.

-- 
Angel L. Mateo Martínez
Sección de Telemática
Área de Tecnologías de la Información       _o)
y las Comunicaciones Aplicadas (ATICA)      / \\
http://www.um.es/atica                    _(___V
Tfo: 868887590
Fax: 868888337