acct_unique module - Dynamic Client-IP-Address causes duplicate session entries in accounting table

[Gunther]

Alan DeKok wrote:
> "Gunther" <freeradius at caribsms.com> wrote:
> > But when the connection to the ISP drops for a moment, a new 
> > Client-IP-Address will be used and the Acct-Unique-Session-Id will 
> > change in the middle of a session.
> 
>   You're saying a users session stays up even if the NAS goes 
> down?  I haven't heard that before.

No, the NAS does not go down, just either the router to the ISP or the ISP,
causing
a new IP address in a ISP DHCP environment

> 
> > Any recommendations on this?
> 
>   It looks like it would work, but why is the 
> Client-IP-Address changing?

Yes, for the last 12 hours it works well. The Client-IP-Address changes when
the connection
to the ISP is down for whatever reason.

Here two packets were the ISP connection was down for 30 minutes (a moment),
while the NAS
was up and running, keeping the session alive. With the use of
Calling-Station-Id instead
of Client-IP-Address for acct_unique, the existing accounting table entry
will be used instead 
of adding another entry for the same session (Acct-Unique-Session-Id remains
the same!):

Sat Nov 18 12:18:10 2006
        Acct-Status-Type = Interim-Update
        User-Name = "MyUsername"
        Calling-Station-Id = "00-0D-88-00-xx-B9"
        Called-Station-Id = "00-16-B6-1C-xx-32"
        NAS-Port-Type = Wireless-802.11
        NAS-Port = 8
        NAS-Port-Id = "00000008"
        NAS-IP-Address = 0.0.0.0
        NAS-Identifier = "00-16-B6-1C-xx-34"
        Framed-IP-Address = 192.168.182.5
        Acct-Session-Id = "455e3b1a00000008"
        Acct-Input-Octets = 213280
        Acct-Output-Octets = 213280
        Acct-Input-Gigawords = 0
        Acct-Output-Gigawords = 0
        Acct-Input-Packets = 2666
        Acct-Output-Packets = 2666
        Acct-Session-Time = 48859
        Client-IP-Address = xx.yy.80.129
        Acct-Unique-Session-Id = "36857b8cc9e1608f"
        Timestamp = 1163852290


Sat Nov 18 12:48:40 2006
        Acct-Status-Type = Interim-Update
        User-Name = "MyUsername"
        Calling-Station-Id = "00-0D-88-00-xx-B9"
        Called-Station-Id = "00-16-B6-1C-xx-32"
        NAS-Port-Type = Wireless-802.11
        NAS-Port = 8
        NAS-Port-Id = "00000008"
        NAS-IP-Address = 0.0.0.0
        NAS-Identifier = "00-16-B6-1C-xx-34"
        Framed-IP-Address = 192.168.182.5
        Acct-Session-Id = "455e3b1a00000008"
        Acct-Input-Octets = 221200
        Acct-Output-Octets = 221200
        Acct-Input-Gigawords = 0
        Acct-Output-Gigawords = 0
        Acct-Input-Packets = 2765
        Acct-Output-Packets = 2765
        Acct-Session-Time = 50689
        Client-IP-Address = xx.yy.22.61 <-- New IP Address
        Acct-Unique-Session-Id = "36857b8cc9e1608f" <-- Same unique Id
        Timestamp = 1163854120