It occurred to me that Pavel Cahyna wrote in gmane.os.netbsd.devel.network:
> I'm curious: how did the Livebox know what is the MAC address for
> s559154c5.adsl.wanadoo.nl on the local Ethernet segment?

Apperently, it didn't. I've powercycled the Livebox, and the only arp request
I see is it asking who 192.168.5.10 is. 

-- 
    Martijn van Buul - pino@dohd.org - http://www.stack.nl/~martijnb/
	 Geek code: G--  - Visit OuterSpace: mud.stack.nl 3333
 The most exciting phrase to hear in science, the one that heralds new
discoveries, is not 'Eureka!' (I found it!) but 'That's funny ...' Isaac Asimov