[Planetlab-users] tcpdump and capturing incoming packets

[Sapan Bhatia]

Hi Greg and Zhichun,

Could you try your code on the following boxes:
planetlab-7.cs.princeton.edu and delta.cs.princeton.edu?

If it doesn't work, then it would be nice if you could come up with a
test case that I could execute to observe the problem.

Thanks,
Sapan

On Wed, Jul 9, 2008 at 8:08 PM, Greg Banks <nomed at cs.ucsb.edu> wrote:
> hi all,
>
> i am new to planet lab and am having some problems with tcpdump and
> capturing http sessions that are originating from my slice/node. basically,
> i see all outgoing packets, including those with an HTTP payload, but only
> incoming ACKs with no HTTP payload (not even SYN/ACK packets). here is some
> sample output when trying to capture http traffic to a proxy running on port
> 4545:
>
> 01:04:33.187359 IP planetlab01.dis.unina.it.43387 >
> planetlab01.mpi-sws.mpg.de.worldscores: S 1248952370:1248952370(0) win 5840
> <mss 1460,sackOK,timestamp 1116447448 0>
> E..8". at .@............{..Jq.2........K..........
> B.......
> 01:04:33.219712 IP planetlab01.dis.unina.it.43387 >
> planetlab01.mpi-sws.mpg.de.worldscores: . ack 55681466 win 5840
> <nop,nop,timestamp 1116447481 229909180>
> E..4". at .@............{..Jq.3.Q.......(.....
> ."..
> 01:04:39.933180 IP planetlab01.dis.unina.it.43387 >
> planetlab01.mpi-sws.mpg.de.worldscores: P 0:15(15) ack 1 win 5840
> <nop,nop,timestamp 1116454194 229909180>
> E..C". at .@............{..Jq.3.Q.......K.....
> .".GET / HTTP/1.1
>
> 01:04:39.966642 IP planetlab01.mpi-sws.mpg.de.worldscores >
> planetlab01.dis.unina.it.43387: . ack 15 win 5792 <nop,nop,timestamp
> 229915928 1116454194>
> E..4.f at .1.7{...........{.Q..Jq.B....[......
> .=.B..2
> 01:04:45.387559 IP planetlab01.dis.unina.it.43387 >
> planetlab01.mpi-sws.mpg.de.worldscores: P 15:37(22) ack 1 win 5840
> <nop,nop,timestamp 1116459649 229915928>
> E..J". at .@............{..Jq.B.Q.......t.....
> .=.host: www.cs.ucsb.edu
>
> 01:04:45.419964 IP planetlab01.mpi-sws.mpg.de.worldscores >
> planetlab01.dis.unina.it.43387: . ack 37 win 5792 <nop,nop,timestamp
> 229921384 1116459649>
> E..4.g at .1.7z...........{.Q..Jq.X....0......
> .RhB...
> 01:04:45.628316 IP planetlab01.dis.unina.it.43387 >
> planetlab01.mpi-sws.mpg.de.worldscores: P 37:38(1) ack 1 win 5840
> <nop,nop,timestamp 1116459889 229921384>
> E..5". at .@............{..Jq.X.Q......%......
> .Rhq
>
> 01:04:45.661794 IP planetlab01.mpi-sws.mpg.de.worldscores >
> planetlab01.dis.unina.it.43387: . ack 38 win 5792 <nop,nop,timestamp
> 229921625 1116459889>
> E..4.h at .1.7y...........{.Q..Jq.Y..../......
> .SYB..q
> 01:04:46.307563 IP planetlab01.dis.unina.it.43387 >
> planetlab01.mpi-sws.mpg.de.worldscores: . ack 1449 win 8688
> <nop,nop,timestamp 1116460569 229922271>
> E..4". at .@............{..Jq.Y.Q.b..!........
> .U..
> 01:04:46.307768 IP planetlab01.dis.unina.it.43387 >
> planetlab01.mpi-sws.mpg.de.worldscores: . ack 2897 win 11584
> <nop,nop,timestamp 1116460569 229922271>
> E..4". at .@............{..Jq.Y.Q.
> ..- at .......
> .U..
> 01:04:46.307790 IP planetlab01.dis.unina.it.43387 >
> planetlab01.mpi-sws.mpg.de.worldscores: . ack 4127 win 14480
> <nop,nop,timestamp 1116460569 229922271>
> E..4". at .@............{..Jq.Y.Q....8........
> .U..
> 01:04:46.483128 IP planetlab01.dis.unina.it.43387 >
> planetlab01.mpi-sws.mpg.de.worldscores: . ack 5575 win 17376
> <nop,nop,timestamp 1116460744 229922446>
> E..4". at .@............{..Jq.Y.Q....C........
> .V..
> 01:04:46.483155 IP planetlab01.dis.unina.it.43387 >
> planetlab01.mpi-sws.mpg.de.worldscores: . ack 7023 win 20272
> <nop,nop,timestamp 1116460744 229922446>
> E..4". at .@............{..Jq.Y.Q.(..O0.......
> .V..
> 01:04:46.484308 IP planetlab01.dis.unina.it.43387 >
> planetlab01.mpi-sws.mpg.de.worldscores: . ack 8231 win 23168
> <nop,nop,timestamp 1116460745 229922446>
> E..4". at .@............{..Jq.Y.Q....Z........
> .V..
> 01:04:46.484331 IP planetlab01.dis.unina.it.43387 >
> planetlab01.mpi-sws.mpg.de.worldscores: . ack 9679 win 26064
> <nop,nop,timestamp 1116460745 229922447>
> E..4". at .@............{..Jq.Y.Q....e........
> .V..
>
> should this be the case? am i doing something wrong? any suggestions would
> be much appreciated. thanks.
>
> cheers,
> greg
>
> _______________________________________________
> Users mailing list: Users at lists.planet-lab.org
> https://lists.planet-lab.org/mailman/listinfo/users
>