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Problem: pppd keeps connection up

I have a Debian gateway system, doing pppd demand dialling. ISP gives 
a new IP address with each connect. No problems with that - it works 
as advertised.
My problem is that once up, it often does not shut down even when there 
has been no traffic from me for longer than the set time-out period. 
The reason appears to be traffic coming in from outside. It looks 
(Ethereal) as though it is traffic for a previous user of the IP address
I now have.
My (simple) iptables rules ensure that my machine does not respond, 
but the traffic is enough to trigger pppd into keeping the connection 
I note that back in Jan 2003, someone had the same problem but got no 
response on the mailing list. 

How can I ensure that traffic initiated from outside does not keep 
the dial-up connection open?

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