On Fri, Jun 08, 2001 at 09:45:31AM +1200, Don Stokes wrote: Well, no, but then ethernet (in common with every other sensible link level protocol) doesn't send acknowledgments. TCP does and uucp (g protocol at least) does, so you have a bunch of TCP packets flying back to the other end carrying uucp acknowledgments. Eh? What the hell are you on about? The point I was making is that multiple layers of checksumming is hardly new, nor something I would consider bad (perhaps superfluous, the IPv6 designers choose to drop this and require lower-layers provide checksumming). Yes, there is additional overhead, but who really cares? How many MUAs and MTAs support BDAT (rfc3030 ???) to avoid the >33% expansion that base64 encoding gives to attachments? --cw --------- To unsubscribe from nznog, send email to majordomo(a)list.waikato.ac.nz where the body of your message reads: unsubscribe nznog