[Ulf Lamping <ulf.lamping@xxxxxx>]

Guy Harris wrote:

> On Sun, Jul 18, 2004 at 11:11:46AM +0200, Ulf Lamping wrote:
>  
>
> > But how to handle the IP addresses outside of your "own networks", 
> > meaning behind a router?
> >    
>
> traceroute/tracert is your friend. :-)
>
> If we could ask the IP stack "if I were to send a packet to address
> XXX.XXX.XXX.XXX/XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX, in some other
> fashion than using traceroute/tracert or doing the same thing it does,
> and using that to get the IP address of the first hop, what interface
> would you send it out", that'd be ideal, but I'm not sure that's doable
> on any OSes.  We could fetch the routing table on some OSes, and make
> the routing decision ourselves, but that's a bit of work.
>  
Well, the interface we would send a packets to, is not necessarily the 
interface we receive packets from.

Especially at the time, when the router changes it's mind about the route.

Although it's a good hint, it might not be the right thing under any 
circumstances.

As I would think of Ethereal as a measuring tool, I would like accuracy 
for the features it provides.

Regards, ULFL