Well, yes and no...
Apple did include a super-limited version of IPNetRouter with Mac OS 9: the Airport Software Base Station.
Other than that, Apple very long ago released a product called Apple Internet Router (or something like that), but it was in the pre-internet time, it actually meant "inter-network" and was actually an AppleTalk routing product.
What was the name of the software this other guy is talking about?
tooki