On Tue, 2005-03-01 at 07:38, Mark Smith wrote: > Are you able to put a rough date of manufacture on those cards/chipsets > ? I've recently done a bit of looking into the chips on the old NE2K > style cards (the NatSemi NS8390D chipset), and even they have a > multicast filtering capability. I first encountered them on NICs in 1992 > (if not earlier, maybe 1990 or so), so I'm curious how much earlier > before that multicast was implemented the way you have stated.
I think it's far more likely that Alexandru is running into broken drivers and/or bridges. I've seen: 1) device driver bugs. either they fail to program the multicast filter or they try and get it wrong. A common multicast filter is a bit vector with associated hash function. (if filter[hash(dst)] is set, receive packet). If the driver miscomputes the hash function, bits don't move. Many ethernet chipsets have a "receive all multicasts" bit, which at least saves you from the full pain of promiscuous mode. 2) firmware bugs in 802.11 access points. (the vendor had a firmware upgrade available fixing it by the time I noticed the problem). - Bill -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------