I was wondering if there was a way, through filters or otherwise, to block
a packet from a specified port if the link is down, but pass it if the
link is up on a dial-on-demand link.
Specifically, I would like to run xntpd on my machine. Since xntpd likes
to send out packets every couple of minutes or so, it continually brings
up the link. What I'd like my OR to do is if the link is up, to pass the
ntp packet. If the link is down, I would like it to stay down and the
packet dropped.
This is the way that the OR deals with RIP packets, so the mechanism to
deal with this sort of thing is already in the code, but I can't figure
out how to get this functionality for other types of packets.
Morningstar PPP had a really neat interface for this. A packet type could
be spcified as one of three types:
1) bring up -- These packets would cause the link to be brought up
2) keep up -- These packets would reset the timout counter to 0
3) pass -- These packets would *not* bring up the link or keep
it up, but would be passed if the link was already up.
Anything like this for Portmasters??
-- Steven.
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