RE: iptables - how to create a rule that expires automatically

["Gilad Benjamini" <gilad.benjamini@gmail.com>]

One thing to note is that you actually delete the exact same rule you added.
There is no built-in method to do that.
I can think of a few ideas how to verify that (with high probability, not
100%) but it really depends on the actual requirements.

> -----Original Message-----
> From: netfilter-owner@vger.kernel.org [mailto:netfilter-
> owner@vger.kernel.org] On Behalf Of Peter Renzland
> Sent: Thursday, February 19, 2009 9:57 AM
> To: Colin Davis
> Cc: netfilter@vger.kernel.org
> Subject: Re: iptables - how to create a rule that expires automatically
> 
> I would write a simple script "ipoff NN" which takes the same
> arguments as iptables (after NN), converts -I and -A to -D, etc, and
> sleeps NN minutes before doing the cancel.
> 
> Then, after running the command that sets up the rule, I would just
> arrow up and change iptables to ipoff NN.
> That would be *very usable*, IMHO.
> 
> (I most definitely would not use cron or at, since those tools do not
> naturally match the problem at all.)
> 
> 
> Peter
> 
> 
> On 09  Feb 19, at 12:42 , Colin Davis wrote:
> 
> >
> > Thanks Ivan, I was hoping to be able to do this directly using a rule
> > without writing a script / using cron but looks like that's what I'm
> > going
> > to have to do.
> >
> > Colin.
> >
> >
> > Ivan Petrushev wrote:
> >> I'm not sure if that can be done with the netfilter itself.
> >> You could always get a script into crontab to check if the rule is
> >> matched (iptables ... -L -n -v will show you number of packets
> >> matched
> >> by the rule) and set up some sort of a timer.
> >>
> >> Ivan
> >>
> >> On Thu, Feb 19, 2009 at 7:10 PM, Colin Davis <col@colsmemory.co.uk>
> >> wrote:
> >>
> >>> Hi,
> >>>
> >>> Not sure if this is possible. I wish to create a rule that once
> >>> created will
> >>> automatically expire (and be removed) after say 10 minutes.
> >>>
> >>> Please
> >>>
> >>> Many thanks,
> >>> Colin.
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