On Fri, Jul 11, 2008 at 01:28:19AM +0000, Hendrik Boom wrote: > On Thu, 05 Jun 2008 10:03:09 -0700, Andrew Sackville-West wrote: > > > On Thu, Jun 05, 2008 at 11:11:55AM -0400, [EMAIL PROTECTED] wrote: > >> I have my network front end running Debian sarge (yet, it's time to > >> upgrade at lest to etch). It's connected to the rest of the net by a > >> DSL line. I've set up port-forwarding to selected machines on my LAN > >> for the convenience of certain games, and bittorrent, and I'd like to > >> use it for some always-on applications. > >> > >> But every now and then, once every week or two, the port-forwarding > >> drops out, and I have to reestablish it by running the same script that > >> gets run on startup. > >> > >> Does anyone have any idea how to track down the problem? I've looked at > >> the system logs and not found anything suspicious. But probably I don't > >> know which logs to look in, or what to look for in them, and it would be > >> as plain as day if I did. > >> > >> If this is a known sarge problem, of course upgrading to etch would be > >> the solution. > > > > just a couple of suggestions. > > > > 1) if you're planning to upgrade, go ahead and do it, the problem may > > just go away. That doesn't really necessarily solve the problem > > though... > > > > 2) does your DSL connection go down from time to time? maybe it's > > dropping out and the system isn't recovering properly. > > > > 3) next time it goes down, instead of just rerunning the network > > scripts, see if you can diagnose the situation a little bit. look at > > the output of > > > > ifconfig > > route > > and maybe get a dump from iptables. > > > > then compare to the state of things when the system is working.
have a look at /etc/ppp/ip-up.d/
> >
> > A
>
> OK. It happened again, just now. My son complained that the internet was
> down. I ssh'ed to my gateway machine, and ppp0 was up, but had a
> suspiciously low packet count (about 150 packets) within a few seconds
> it was up to about 250, so it looked as if ppp0 had just come up.
>
> I checked my iptables, and the port forwarding had shut down.
> I ran the script is uses to start port-forwarding at boot
> time, and it was up and running again in no time.
>
> I went and looked at syslog. It looks very much as if the
> ppp0 connection had shut down for a minute or two, and was
> automatically restarted. Apparently shutdown of ppp0 was
> enough to kill all the port-forwarding instructions
> relating to it (which was all of them), and the script did
> not get run when the ppp0 connection was reestablished.
>
> So, the question becomes,
> (a) how do I ensure that the script gets rerun when ppp0 comes
> up
> or
> (b) How do I keep the forwarding from being dropped when ppp0 goes down?
>
> -- hendrik
>
>
> --
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--
"Our enemies are innovative and resourceful, and so are we. They never stop
thinking about new ways to harm our country and our people, and neither do we."
- George W. Bush
08/05/2004
Washington, DC
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