IPRewriter and IPMapper

[Eddie Kohler]

> Cool.  That change makes my element work, but RoundRobinIPMapper seems to
> be still.  It also implements notify_rewriter(...) whereas the one I've
> written does not, maybe that needs to be virtual as well?  The two times
> I've tried RoundRobin, I've gotten a lot of NULL pointer deference
> problems (the machine is not in close phyiscal proximity to me, so I don't
> have the luxury of rebooting and trying again).

Weird -- it doesn't break for me here. Could you run "CLICK/test/testie
CLICK/test/RoundRobinIPMapper/t01.testie" and say whether that fails?

E