Default behaviour of IP Options processing
Andre Oppermann
andre at freebsd.org
Thu May 6 12:47:29 PDT 2004
Julian Elischer wrote:
>
> On Thu, 6 May 2004, Andre Oppermann wrote:
>
> > I have just committed the attached change to ip_input() to control the
> > behaviour of IP Options processing. The default is the unchanged
> > current behaviour.
> [...]
> > routing. The remaining IP Options are RR (record route) and TS (time
> > stamp) which are both useless. For finding out which path a packet takes
> > we use traceroute instead of RR. Besides that RR is limited to the space
> > in the IP Options field and can possibly record only a few hops (9 IIRC).
> > Time stamp is useless for the same reason and since it doesn't have a
> > fixed and synchronized timebase it is even more so useless.
> >
> > Opinions? Discussion? Yes/Nay?
>
> I use RR all the time.
> it allows you to record the reverse path, (up to the size limitation).
Which won't get you far these days... ;-)
> what about inet6 ? do you plan on doing things there?
> There are more options defined there..
As far as I am aware IPv6 packets do not have any option space in the
packet header. You have header stacking there though which has its
own evil implications...
--
Andre
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