On Tue, Apr 20, 2004 at 06:16:48PM -0700, Michael Richardson wrote: > Darren> btw, is it at all easily possible to get the 802.3 checksum > Darren> into captured data ? > > On some OSes you ask for that. Not on BSD AFAIK, yes, with PF_PACKET > on Linux.
Some BSDs give it to you, at least for some interfaces, with no way of not getting it (OS X with the Apple 10/100/1000 interfaces, and I think at least some NetBSD drivers do). How do you ask for it on Linux? (Or are they like those BSDs in that regard?) > And with GbE encoding, ECC memory and parity protected L3 cache buses, > the PCI bus *is* the least reliable interface in a typical PC. I believe > that people who do TCP checksum offload have experienced this problem > already. "Everything old is new again." We had a similar problem with an EISA-bus network device at Network Appliance ages ago - we didn't turn UDP checksumming on by default, and that problem caused us to do so, and the checksum caught the problem. - This is the tcpdump-workers list. Visit https://lists.sandelman.ca/ to unsubscribe.
