ipfilter vs nintendo DS

[David Hough running ipfilt <fireman2006@sbcglobal.net>]

My daughter just got a nintendo DS.     I finally got it through ipfilter, by putting
some big holes in.    It looks to me like the nintendo DS was coded by somebody
who was rather vague about how TCP is supposed to work.    I might be wrong
about that, but I googled into several college websites that said the device
was not and never would be supported through their firewalls.

Anyway, my inclination is simply to put a wireless router outside my firewall
and let her use that.    But if somebody has gotten it working in a satisfactory
way inside ipfilter, I'd appreciate some hints.

Or if it's known to be a hazardous device outside firewalls, I'd like to know that
too.