[Ns-developers] gsoc wrapup

[Florian Westphal]

Mathieu Lacage <mathieu.lacage at sophia.inria.fr> wrote:
> > As for the nsc stacks, the main problem is that the Linux stacks
> > that work on both x86 and x86_64 generate different pcap traces
> > depending on the host architecture (for instance, it will pick different TCP
> > source ports on x86 vs. _64).
> 
> oh ? Would you care to elaborate ?

Sorry, I havn't investigated why its different.
On 2nd glance, the port numbers are the same on 2.6.26 32 and 64 bit
kernels, but differ on 2.6.18 32 vs. 64 bit builds.

Traces are different in any case, e.g. with 2.6.26 the first 100 packets
or so are the same, but then you'll see the push flag set in one of the
traces. (i ran them through tcpdump -r and diff'd the output).

I've put up the traces i get on my box (x86) and on ns-test (x86-64)
here:
http://strlen.de/cradle/trace_32_64/
(please fetch the .bz2 ones; the uncompressed pcaps are for those
that want to take a look at the traces but don't have the bunzip2
unpacker)

I'll see if I can find the cause of this.

Florian