Subject: Re: how to setup the active-filter-in for pppd
To: Frederick Bruckman <>
From: Chan Yiu Wah <>
List: current-users
Date: 01/08/2000 06:50:55
What I need is the demand dialup is depend on the traffic reuqest to the 
ISP by the clients in the LAN not by the holdoff option. So I set the
holdoff to 86400 seconds (one day) to prevent it to call up the ISP after
the idle time.


On Fri, 7 Jan 2000, Frederick Bruckman wrote:

> On Fri, 7 Jan 2000, Chan Yiu Wah wrote:
> > I am trying to write the  active-filter-in for my demand dial up to ISP. 
> > However, I am not skill enough to work it out. Here is part of the 
> > tcpdump and the pppd call to my local ISP.  Should I put the port number
> > in the active-filter-in "ip 1514 or ip 60" and so on.  I need your help.
> If i understand your meaning correctly, all you need is
> active-filter   'not udp port ntp'
> > active-filter-in "udp or (tcp and not tcp port ntp)"
> ntpd uses udp exclusively.