arp querier/responder for multiple ip addrs on multiple networks using the same interface

[Eddie Kohler]

> I assumed a multi-arp querier would include several network addr/masks, and
> therefore could choose one in a network that included the dst addr.

Well, ARPQuerier actually doesn't take a network address or a mask right
now. Just an IP address to stick into the query.

I agree with Brecht that this is not a very big deal, that the IP address
in the query is probably ignored. If you want this behavior, feel free to
write an element to do it.

> Thanks; this should make a difference, but still waste cycles polling
> DelayUnqueues when they contain packet with long residual delays.  Perhaps

Let's see whether this step helps you, especially since your delays are
short.

Your proposed next step is a real step up in complexity and, therefore,
overhead. There are simpler ways that we'd probably try first.

Eddie