I didn't meant to come of ranting (lol) but I was actually quite surprised to see this.
my network has a .251 router (history reasons, my 'plastic firewall' was once forced at .251 and I just kept it over the years).
right there - is a reason why the 'dot one' idea breaks. it really is arbitrary and best practice is to have users just enter the darned quad of info ;)
yes, I do run a pure class C at home but again, its so easy just to require the user to enter all 4 bits of info. the ard. is not a high end system and making the user enter all 4 bits is not such a burden ;)
(well, entering a mac is quite surprising to me, as well. but I'll ignore that since its far less dangerous for the user to pick a mac than to 'guess' that the router is dot-one) ;)
what really got me was that I could ping into the ard from other hosts on the lan but if the ard wanted to originate a packet (to google, via the demo code) it would get 'nothing but dialtone', so to speak.
default routers are important once you have to leave your lan (lol) and so guessing one is just really really wrong. unless you DISCOVER one, but that's way more than an ard-level box should really have to do.
(such a damned pity that dhcp isn't supported yet, although I admit I run only static IP's in my network).