On 04/18/2012 02:24 PM, Darrell Anderson wrote:
> I don't know whether the DD-WRT router firmware can distinguish internet usage among all machines here. knemo would become more useful to me if the app could distinguish the difference. If I had only one machine here then there is no need for a distinction, of course. I'm sure many knemo users fit that description --- perhaps bug report (enhancement request) 322 is beyond the scope of the app.

I think it can be easily done and I like the internal verses distinction.
However, as your dd-wrt router probably also functions as your gateway, its
iptables code can easily check internal/external at the point it sits on the
network. For a client machine to do it, it would basically just have to filter
packets and say:

if ip = mine; then
  it's local
elif ip = myClassC subnet; then
  it's internal
else
  it ain't local and it ain't internal, so it must be external.

I'm just not sure how 'authoritative' an app like knemo could be on making that
determination - I'm no routing guru.

-- 
David C. Rankin, J.D.,P.E.