conntrack table not refreshed

[JVD]

hi all,

I've an adsl internet connection.  My firewall is stopped after each
disconnection and re-launched after the automatic reconnection.
(My ip changes each time)
I use edonkey program on my internal network (goes through my gateway to
internet).
I is not restarted when i lose my internet connection.
When i type " cat /proc/net/ip_contrack" it gives me all all assured
connections ...
(iptables 1.2.1)

Why are there assured connection between eDonkey clients and my previous ips
???
(src=edonkey client ; dst=my previous ip)
iptables says that there are assured connection for my 3 last ips now !!??
What could i make to drop (refresh) the conntrack table ?
Maybe it is an eDonkey problem but in my opinion, iptables should drop all
connections when iptables is launched and after create new ones when it is
needed... no ?

Regards
Jean