This one time, at band camp, Adam Nellemann said:

> Isn't there at least some difference?
>
> I should think the LAN interface might see a lot of LAN traffic (how's
> that for stating the obvious!) which one would usually not want to shape
> (and thus one would need special shaper rules ommiting such local
> traffic, or for sending it through pipes/queues made for LAN traffic).

unless your internal network uses simple hubs rather than switching hubs,
the only traffic the LAN interface will see is destined for another
interface (WAN, PPTP, DMZ, Wireless, etc.), or destined to be dropped by
the ruleset....  so you don't have to worry about shaping internal
traffic.

jj