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Behaviour of cards under Multicast. This is how they currently 
behave not what the hardware can do. In particular all the 8390 based
cards don't use the onboard hash filter, and the lance driver doesn't
use its filter, even though the code for loading it is in the DEC
lance based driver.

The following multicast requirements are needed
-----------------------------------------------
Appletalk       Multicast       hardware filtering not important but
                                 avoid cards only doing promisc
IP-Multicast    Multicast       hardware filters really help
IP-MRoute       AllMulti        hardware filters are of no help


Board           Multicast       AllMulti        Promisc         Filter
------------------------------------------------------------------------
3c501           YES             YES             YES             Software
3c503           YES             YES             YES             Software(#)
3c505           YES             NO              YES             Hardware
3c507           NO              NO              NO              N/A
3c509           YES             YES             YES             Software
3c59x           YES             YES             YES             Software
ac3200          YES             YES             YES             Software(#)
apricot         YES             PROMISC         YES             Hardware
arcnet          NO              NO              NO              N/A
at1700          PROMISC         PROMISC         YES             Software
atp             PROMISC         PROMISC         YES             Software
de4x5           YES             NO              YES             Hardware
de600           NO              NO              NO              N/A
de620           PROMISC         PROMISC         YES             Software
depca           YES             PROMISC         YES             Hardware
e2100           YES             YES             YES             Software(#)
eepro           YES             PROMISC         YES             Hardware
eexpress        NO              NO              NO              N/A
ewrk3           YES             PROMISC         YES             Hardware
hp-plus         YES             YES             YES             Software(#)
hp              YES             YES             YES             Software(#)
hp100           YES             YES             YES             Software(#)
ibmtr           NO              NO              NO              N/A
lance           YES             YES             YES             Software(#)
ne              YES             YES             YES             Software(#)
ni52
ni65            NO              NO              NO              N/A
seeq            NO              NO              NO              N/A
sk_g16          NO              NO              YES             N/A
smc-ultra       YES             YES             YES             Software(#)
tulip           YES             YES             YES             Hardware
wavelan         YES             PROMISC         YES             Hardware
wd              YES             YES             YES             Software(#)
znet            YES             YES             YES             Software


PROMISC = This multicasts mode is in fact promiscuous mode. Avoid using
cards who go PROMISC on any multicast in a multicast kernel.
(#) = Hardware multicast support is not used yet.