Subject: Re: how to setup the active-filter-in for pppd
To: Chan Yiu Wah <email@example.com>
From: Frederick Bruckman <firstname.lastname@example.org>
Date: 01/07/2000 09:46:25
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.