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Date: Thu, 18 May 2006 16:21:20 +0200
From: cknipe@savage.za.org
To: "Michael P. Soulier" <msoulier@digitaltorque.ca>
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Cc: freebsd-questions@freebsd.org, Nikos Vassiliadis <nvass@teledomenet.gr>
Subject: Re: pppoe reliability
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Quoting "Michael P. Soulier" <msoulier@digitaltorque.ca>:
> I've noticed that when I drop ppp, the tun0 seems to hang on a bit. If
> I restart too quickly, I get a tun1. The ifconfig command will not
> permit me to destroy tun0 either, so I wait for a little while before
> bringing it back up again.

In the ppp.linkdown 
mylabel:
 iface clear

That will clear the interface and also remove the address when the PPPoE goes
down.