[Planetlab-users] tcpdump and capturing incoming packets

[Sapan Bhatia]

Great! :)

Could you try now?

Sapan

On Mon, Jul 14, 2008 at 7:20 PM, Greg Banks <nomed at cs.ucsb.edu> wrote:
> hey sapan,
>
> i just ran the same test case on echo.cs.princeton.edu and it does NOT
> currently work :-)
>
> cheers,
> greg
>
> On Jul 14, 2008, at 4:17 PM, Sapan Bhatia wrote:
>
>> Hi Greg,
>>
>> Ok, that's one problem down in that case. The tweak I made was to
>> allow slices to receive packets over TIME_WAIT connections, which they
>> were previously not allowed to do.
>>
>> Could you try your code on this node: echo.cs.princeton.edu. It's an
>> alpha node that I'll be able to update with my change. If it doesn't
>> work for you when you test it now, but works after the change, then we
>> can mark the change for deployment.
>>
>> Thanks very much!
>> Sapan
>>
>> On Mon, Jul 14, 2008 at 6:50 PM, Greg Banks <nomed at cs.ucsb.edu> wrote:
>>>
>>> hi sapan,
>>>
>>> i just tried out my test case on delta and planetlab-7 and they both seem
>>> to
>>> function fine. all i did was run:
>>>
>>> nc planetlab2.cse.nd.edu 4545
>>>
>>> submitting a GET request to the proxy there:
>>>
>>> GET / HTTP/1.1
>>> host: www.cs.ucsb.edu
>>>
>>> tcpdump reported all the packets (except for the SYN/ACK, which i do need
>>> access to, but i guess this is provided through vsys somehow?)...
>>>
>>> i also tried it again using the host that i used originally
>>> (planetlab01.dis.unina.it) with no success...
>>>
>>> cheers,
>>> greg
>>>
>>> On Jul 14, 2008, at 2:52 PM, Sapan Bhatia wrote:
>>>
>>>> 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
>>>>>
>>>
>>>
>
>