> For a router or firewall, you really, really want to have all
> interfaces running on add-in NICs, so that you can avoid this
> problem.

Which problem?  High interrupt load due to poor interface buffering?
Isn't a dedicated router box just where you _don't_ care about that?
My main house LAN gateway box is an IPX with an addon Ethernet in each
SBus slot (Ethernet/SCSI, but I don't normally use scsibus[12]).
(le0 (on-board) is the main (routable) portion of the house LAN, le1 is
the DSL, and le2 is the non-routable portion of the house LAN.)

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