[Planetlab-users] Re: Networking-related issues

[Sapan Bhatia]

Hi Zichun,

Somebody was experimenting with delta. Sorry about that. It has been
restored to a working state, but in case you still see problems, please
continue to use planetlab-7 and alice.

planetlab-7 and alice have more-or-less the same software -- that you didn't
notice the reordering issue on planetlab-7 is probably a matter of chance.
We noticed the packet-reordering problem earlier today. How important is it
for your analysis? Is it easy to work around, given that the packets are
timestamped?

Sapan



On Mon, Jul 28, 2008 at 2:40 PM, Hecker W <heckerme at gmail.com> wrote:

> Hi Sapan,
>
> I have tested my code on alice,delta and planetlab-7. I got totally
> different results on these three nodes!
> 1) For planetlab-7, the problem has been solved. I have been
> successfully run the TCPDUMP. I got the TCP SYN/ACK and all the
> payloads. I have done tcp reassembly and recovered the file I
> transfer. They are indeed same!
> 2) For alice, I think I might get all the payload packets. However,
> the TCP SYN/ACK packet comes AFTER the TCP ACK packet from the
> senders, although TCP SYN/ACK packet's timestamp is earlier. In other
> words, the tcpdump trace is not sorted by the timestamp which make my
> analysis tool fail.
> 3) For delta, I only get outgoing direction traffic (same for TCP and UDP).
>
> If you guys can make every node like planetlab-7, my problem is
> solved. Thanks a lot!
>
> If you guys need me to provide any trace or other information, please
> just let me know.
>
> -Zhichun
>
> On Sun, Jul 27, 2008 at 11:14 PM, Sapan Bhatia <sapanb at cs.princeton.edu>
> wrote:
> > Hello,
> >
> > The following issues have (hopefully) been resolved on a set of alpha
> > nodes (listed below). If you complained about any of them, then please
> > kindly retry your code to verify the fixes.
> >
> > * Intermittent loss of TCP payload packets with packet sockets
> > * Syn/Ack packets not showing up in tcpdump
> > * TCP-related ICMP error messages not showing up in tcpdump.
> >
> > The nodes are: [alice,delta].cs.princeton.edu and
> planetlab-7.cs.princeton.edu.
> >
> > Please verify all three nodes, if possible.
> >
> > Thanks in advance,
> > Sapan
> >
>



-- 
Sapan Bhatia
www.cs.princeton.edu/~sapanb
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