* On 11 Nov 2009, Darren Reed wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > David Champion wrote: > | ... > | ipReasmTimeout = 15 ipReasmReqds = 0 > > I suspect that this line here is the key to the problem. > > Using snoop... > - - do you see all of the data/packets arrive on xnf0?
As I recall I see some, but since the packets never arrive on vnic1 (zoned), they're never ACKed, and TCP abates transmission. It doesn't take long before I see no more packets coming into xnf0 at all. > - - do packets go missing between xnf0 and vnic0? > - - do packets go missing between vnic0 and vnic1? I looked at simultaneous snoop output originally, but I'm afraid I didn't take notes on this. I can check this again if it's useful information for you or someone else, but I went straight for your suggestion: > Try changing the mtu of vnic0 and vnic1 down from 9000 to 1500. > To do this, add a new line to hostname.vnic0 and hostname.vnic1 on > each of the respective hosts that is "mtu 1500". Perfect! That solved the problem, and makes sense to me as well. It sounds like this has nothing to do with EC2 per se. Is MTU matching necessary only because ipnat is involved? I appreciate your looking this over. I'll share the information with the other groups I've talked to. -- -D. [email protected] NSIT University of Chicago
