Date: Fri, 31 Dec 1999 12:33:35 +0000 (GMT) From: Andrew Gordon <arg@arg1.demon.co.uk> To: Peter Spekreijse <peter@echelon.nl> Cc: freebsd-isdn@freebsd.org Subject: Re: feauture request Message-ID: <Pine.BSF.4.21.9912311227580.11130-100000@server.arg.sj.co.uk> In-Reply-To: <m123yaA-000PqxC@Charlie.Echelon.nl>
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On Fri, 31 Dec 1999, Peter Spekreijse wrote: > > Is it possible to let i4b dial for a certain type of traffic and discard > other traffic? Something like a dialer-list on a cisco router. > > I'm running ntp at home and like to sync my clock with the one at work. > I don't want my system to dial for this kind of traffic. ntp can sync > when the line is open for "interesting" traffic. I believe that the only way to do what you want is to use /usr/sbin/ppp and the rbch interface to i4b, rather than the built-in isp0: interface. With /usr/sbin/ppp you have separate packet filters for controlling the dial and keep-alive behaviour, distinct from the packet filters that stop the traffic getting out. With /usr/sbin/ppp, you can use something like: set filter dial 0 deny udp dst eq ntp set filter alive 0 deny udp dst eq ntp to do what you want. I don't understand Hellmuth's comment that you can do this with ipfw/ipfilter: even if you adjust your filters when the link is opened/closed, you still have the problem that an ntp transaction will reset the link idle timer and so keep the link open for longer than it should be. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message
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