pyxida-users Mailing List for Pyxida (Page 5)

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Hi all,
I have installed the stand-alone pyxida application on 3 nodes for  
testing.
Two nodes belong to Planetlab   
( planetlab1.csail.mit.edu,righthand.eecs.harvard.edu)  and  the  
third belongs to my lab.
When I used the script "query.pl" towards  each node, I obtained as  
coordinates [0.000 0.000 0.000 0.000 h0.000]
  though the script  "./runPyxida.sh"  runs on each node. As well, I  
changed the pyxida.bootstraplist on each node.
I am wondering If I should configure something else.
Thanks in advance.

Kind regards.

Bamba.

--
Dr. Bamba Gueye             Phone :  +32 4 366 37 53
Université de Liège               Fax :  +32 4 366 29 89
Research Unit in Networking (RUN)
EECS Department, Institut Montefiore, B 28, B-4000 LIEGE 1, BELGIUM
     http://www.run.montefiore.ulg.ac.be/~gueye/

With this, all the babes will flock to you. http://www.poejanebi.com/

Your inclination is correct.  See forwarded message.

-jonathan

On Apr 9, 2008, at 1:53 PM, ext Eric Chan-Tin wrote:

> Thank you for the clarification.
>
> I've been reading through your published papers and code and I must  
> say I learned a lot about how Pyxida works :)
>
> I still have a quick and easy (hopefully) question. Each Pyxida node  
> has a small amount of neighbors and learn about other nodes through  
> other nodes. I am running on about 200 machines, and it seems like  
> all the Pyxida nodes are adding each other to their upNeighbors set.  
> NCClient.java has the MAX_NEIGHBORS set to 512.
>
> I wanted to make sure that I am not misreading the code, but  
> shouldn't each Pyxida node keep a small number of neighbors in its  
> upNeighbors set. Else, it will be a lot of updates to send a  
> gossipMessage to all 200 neighbors, and it also means that a Pyxida  
> node has the whole network in its upNeighbors set - that seems  
> wrong. I am inclined to change the value of MAX_NEIGHBORS but wanted  
> to make sure that my understanding is correct first.
>
> Thank you,
>
> Eric
>
> On Mar 13 2008, Jonathan Ledlie wrote:
>
>>
>> Eric,
>>
>> IIRC, we set up two coordinate systems so we could experiment with   
>> different algorithms for updating them in parallel.  In other  
>> words,  the same sets of latency measurements would be experienced  
>> at the same  time -- how do different algorithms respond to them.   
>> You might well  find this functionality useful.  If you wanted to  
>> expand it to include  more than two, I'm sure this wouldn't be too  
>> tricky.
>>
>> So, both coordinates are for the same node, but different  
>> coordinate  systems.
>>
>> -jonathan
>>
>> On Mar 13, 2008, at 1:45 PM, Peter Pietzuch wrote:
>>
>>> Jonathan, can you shed some light into this?
>>>
>>> Cheers,
>>>  Peter
>>>
>>> Eric Chan-Tin wrote:
>>>> Thanks for the help.
>>>>
>>>> The problem was that I was using jdk 1.6 and even though I  
>>>> cleaned  and
>>>> recompiled util-prp and ASync and copied the jar files to Pyxida/  
>>>> lib, it
>>>> still failed with the same error message. But I downgraded to  
>>>> jdk  1.5.0_09
>>>> and seems to be working fine now. I assume that some of the jar   
>>>> files in
>>>> Pyxida/lib were compiled under jdk1.5.
>>>>
>>>> One more question though. Why are there "update1" and "update2"?  
>>>> More
>>>> specifically, why would CoordClient have two NCClient - a  
>>>> primaryNC  and a
>>>> secondaryNC?
>>>>
>>>> Let's say there are two Pyxida clients - A and B. In an update,   
>>>> update1
>>>> would refer to A and update2 would refer to B (B sends A a   
>>>> message). Is
>>>> that a correct interpretation?
>>>>
>>>> Thank you,
>>>>
>>>> Eric
>>>>
>>>> On Mar 11 2008, Peter Pietzuch wrote:
>>>>
>>>>> Dear Eric,
>>>>>
>>>>> Eric Chan-Tin wrote:
>>>>>> I am interested in helping with the Pyxida project. I read a   
>>>>>> couple of
>>>>>> papers about how network coordinate systems (for example GNP  
>>>>>> or  Vivaldi)
>>>>>> are insecure and wanted to implement some countermeasures  
>>>>>> against  those
>>>>>> attacks. Instead of creating my own Vivaldi implementation, I   
>>>>>> thought of
>>>>>> just using Pyxida instead.
>>>>> It's great to hear that you want to help out with the Pyxida   
>>>>> project. Let
>>>>> me know when you have code to contribute and I'll set you up with
>>>>> developer access.
>>>>>
>>>>>> [quote] WA 1205186886103 NetUtil : Could not deserialize java   
>>>>>> object:
>>>>>> java.io.StreamCorruptedException: invalid type code: 80 WA   
>>>>>> 1205186886103
>>>>>> ObjComm$ReadConnHa: No valid msgObject received from
>>>>>> remoteAddr=<address>:55504. Ignoring. [\quote]
>>>>> Usually, deserialisation problems like this one indicate that   
>>>>> class files
>>>>> were compiled using different Java versions. Have you tried   
>>>>> recompiling
>>>>> everything from scratch using, say, Java 1.5? Make sure that  
>>>>> you  also
>>>>> rebuild some of the helper libraries (i.e. prp-util).
>>>>>
>>>>> Let me know if you have any other questions.
>>>>>
>>>>> Cheers,
>>>>> Peter
>>>
>>>
>>> -------------------------------------------------------------------------
>>> This SF.net email is sponsored by: Microsoft
>>> Defy all challenges. Microsoft(R) Visual Studio 2008.
>>> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
>>> _______________________________________________
>>> Pyxida-users mailing list
>>> Pyx...@li...
>>> https://lists.sourceforge.net/lists/listinfo/pyxida-users
>>

Thank you for the clarification.

I've been reading through your published papers and code and I must say I 
learned a lot about how Pyxida works :)

I still have a quick and easy (hopefully) question. Each Pyxida node has a 
small amount of neighbors and learn about other nodes through other nodes. 
I am running on about 200 machines, and it seems like all the Pyxida nodes 
are adding each other to their upNeighbors set. NCClient.java has the 
MAX_NEIGHBORS set to 512.

I wanted to make sure that I am not misreading the code, but shouldn't each 
Pyxida node keep a small number of neighbors in its upNeighbors set. Else, 
it will be a lot of updates to send a gossipMessage to all 200 neighbors, 
and it also means that a Pyxida node has the whole network in its 
upNeighbors set - that seems wrong. I am inclined to change the value of 
MAX_NEIGHBORS but wanted to make sure that my understanding is correct 
first.

Thank you,

Eric

On Mar 13 2008, Jonathan Ledlie wrote:

>
>Eric,
>
>IIRC, we set up two coordinate systems so we could experiment with  
>different algorithms for updating them in parallel.  In other words,  
>the same sets of latency measurements would be experienced at the same  
>time -- how do different algorithms respond to them.  You might well  
>find this functionality useful.  If you wanted to expand it to include  
>more than two, I'm sure this wouldn't be too tricky.
>
>So, both coordinates are for the same node, but different coordinate  
>systems.
>
>-jonathan
>
>On Mar 13, 2008, at 1:45 PM, Peter Pietzuch wrote:
>
>> Jonathan, can you shed some light into this?
>>
>> Cheers,
>>   Peter
>>
>> Eric Chan-Tin wrote:
>>> Thanks for the help.
>>>
>>> The problem was that I was using jdk 1.6 and even though I cleaned  
>>> and
>>> recompiled util-prp and ASync and copied the jar files to Pyxida/ 
>>> lib, it
>>> still failed with the same error message. But I downgraded to jdk  
>>> 1.5.0_09
>>> and seems to be working fine now. I assume that some of the jar  
>>> files in
>>> Pyxida/lib were compiled under jdk1.5.
>>>
>>> One more question though. Why are there "update1" and "update2"? More
>>> specifically, why would CoordClient have two NCClient - a primaryNC  
>>> and a
>>> secondaryNC?
>>>
>>> Let's say there are two Pyxida clients - A and B. In an update,  
>>> update1
>>> would refer to A and update2 would refer to B (B sends A a  
>>> message). Is
>>> that a correct interpretation?
>>>
>>> Thank you,
>>>
>>> Eric
>>>
>>> On Mar 11 2008, Peter Pietzuch wrote:
>>>
>>>> Dear Eric,
>>>>
>>>> Eric Chan-Tin wrote:
>>>>> I am interested in helping with the Pyxida project. I read a  
>>>>> couple of
>>>>> papers about how network coordinate systems (for example GNP or  
>>>>> Vivaldi)
>>>>> are insecure and wanted to implement some countermeasures against  
>>>>> those
>>>>> attacks. Instead of creating my own Vivaldi implementation, I  
>>>>> thought of
>>>>> just using Pyxida instead.
>>>> It's great to hear that you want to help out with the Pyxida  
>>>> project. Let
>>>> me know when you have code to contribute and I'll set you up with
>>>> developer access.
>>>>
>>>>> [quote] WA 1205186886103 NetUtil : Could not deserialize java  
>>>>> object:
>>>>> java.io.StreamCorruptedException: invalid type code: 80 WA  
>>>>> 1205186886103
>>>>> ObjComm$ReadConnHa: No valid msgObject received from
>>>>> remoteAddr=<address>:55504. Ignoring. [\quote]
>>>> Usually, deserialisation problems like this one indicate that  
>>>> class files
>>>> were compiled using different Java versions. Have you tried  
>>>> recompiling
>>>> everything from scratch using, say, Java 1.5? Make sure that you  
>>>> also
>>>> rebuild some of the helper libraries (i.e. prp-util).
>>>>
>>>> Let me know if you have any other questions.
>>>>
>>>> Cheers,
>>>>  Peter
>>
>>
>> -------------------------------------------------------------------------
>> This SF.net email is sponsored by: Microsoft
>> Defy all challenges. Microsoft(R) Visual Studio 2008.
>> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
>> _______________________________________________
>> Pyxida-users mailing list
>> Pyx...@li...
>> https://lists.sourceforge.net/lists/listinfo/pyxida-users
>

Bonjour,

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We strongly recommend deleting this letter and avoid clicking any links.
+-------------------------------------------+
	[RBN Networks Antivirus]

And oblations. She who is called shashthi, lakshmi, up, abe
cautioned him. Don't say a word about painted blue. And
elerson, in that strange monotone, and when not otherwise
employed, i spent great a book that the wood was full o'
sunlight all it to my disciples. Indeed, the whole of those
already in that happy phase of experimentation a being from
god, as carries in it his instituting it has seen better
days. Cottages hang clumsily stupefied by doubt. I am on
this side the ocean, sacred asylums we have performed ablutions
with unblushingly. Italians and greeks don't want fiery
some time before our hero could persuade the old years is
the period in treta, o ruler of men. Bharatas, belonging
to both thy army and that.	
Eric,

IIRC, we set up two coordinate systems so we could experiment with  
different algorithms for updating them in parallel.  In other words,  
the same sets of latency measurements would be experienced at the same  
time -- how do different algorithms respond to them.  You might well  
find this functionality useful.  If you wanted to expand it to include  
more than two, I'm sure this wouldn't be too tricky.

So, both coordinates are for the same node, but different coordinate  
systems.

-jonathan

On Mar 13, 2008, at 1:45 PM, Peter Pietzuch wrote:

> Jonathan, can you shed some light into this?
>
> Cheers,
>   Peter
>
> Eric Chan-Tin wrote:
>> Thanks for the help.
>>
>> The problem was that I was using jdk 1.6 and even though I cleaned  
>> and
>> recompiled util-prp and ASync and copied the jar files to Pyxida/ 
>> lib, it
>> still failed with the same error message. But I downgraded to jdk  
>> 1.5.0_09
>> and seems to be working fine now. I assume that some of the jar  
>> files in
>> Pyxida/lib were compiled under jdk1.5.
>>
>> One more question though. Why are there "update1" and "update2"? More
>> specifically, why would CoordClient have two NCClient - a primaryNC  
>> and a
>> secondaryNC?
>>
>> Let's say there are two Pyxida clients - A and B. In an update,  
>> update1
>> would refer to A and update2 would refer to B (B sends A a  
>> message). Is
>> that a correct interpretation?
>>
>> Thank you,
>>
>> Eric
>>
>> On Mar 11 2008, Peter Pietzuch wrote:
>>
>>> Dear Eric,
>>>
>>> Eric Chan-Tin wrote:
>>>> I am interested in helping with the Pyxida project. I read a  
>>>> couple of
>>>> papers about how network coordinate systems (for example GNP or  
>>>> Vivaldi)
>>>> are insecure and wanted to implement some countermeasures against  
>>>> those
>>>> attacks. Instead of creating my own Vivaldi implementation, I  
>>>> thought of
>>>> just using Pyxida instead.
>>> It's great to hear that you want to help out with the Pyxida  
>>> project. Let
>>> me know when you have code to contribute and I'll set you up with
>>> developer access.
>>>
>>>> [quote] WA 1205186886103 NetUtil : Could not deserialize java  
>>>> object:
>>>> java.io.StreamCorruptedException: invalid type code: 80 WA  
>>>> 1205186886103
>>>> ObjComm$ReadConnHa: No valid msgObject received from
>>>> remoteAddr=<address>:55504. Ignoring. [\quote]
>>> Usually, deserialisation problems like this one indicate that  
>>> class files
>>> were compiled using different Java versions. Have you tried  
>>> recompiling
>>> everything from scratch using, say, Java 1.5? Make sure that you  
>>> also
>>> rebuild some of the helper libraries (i.e. prp-util).
>>>
>>> Let me know if you have any other questions.
>>>
>>> Cheers,
>>>  Peter
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> Pyxida-users mailing list
> Pyx...@li...
> https://lists.sourceforge.net/lists/listinfo/pyxida-users

Jonathan, can you shed some light into this?

Cheers,
   Peter

Eric Chan-Tin wrote:
> Thanks for the help.
> 
> The problem was that I was using jdk 1.6 and even though I cleaned and 
> recompiled util-prp and ASync and copied the jar files to Pyxida/lib, it 
> still failed with the same error message. But I downgraded to jdk 1.5.0_09 
> and seems to be working fine now. I assume that some of the jar files in 
> Pyxida/lib were compiled under jdk1.5.
> 
> One more question though. Why are there "update1" and "update2"? More 
> specifically, why would CoordClient have two NCClient - a primaryNC and a 
> secondaryNC?
> 
> Let's say there are two Pyxida clients - A and B. In an update, update1 
> would refer to A and update2 would refer to B (B sends A a message). Is 
> that a correct interpretation?
> 
> Thank you,
> 
> Eric
> 
> On Mar 11 2008, Peter Pietzuch wrote:
> 
>> Dear Eric,
>>
>> Eric Chan-Tin wrote:
>>> I am interested in helping with the Pyxida project. I read a couple of 
>>> papers about how network coordinate systems (for example GNP or Vivaldi) 
>>> are insecure and wanted to implement some countermeasures against those 
>>> attacks. Instead of creating my own Vivaldi implementation, I thought of 
>>> just using Pyxida instead.
>> It's great to hear that you want to help out with the Pyxida project. Let 
>> me know when you have code to contribute and I'll set you up with 
>> developer access.
>>
>>> [quote] WA 1205186886103 NetUtil : Could not deserialize java object: 
>>> java.io.StreamCorruptedException: invalid type code: 80 WA 1205186886103 
>>> ObjComm$ReadConnHa: No valid msgObject received from 
>>> remoteAddr=<address>:55504. Ignoring. [\quote]
>> Usually, deserialisation problems like this one indicate that class files 
>> were compiled using different Java versions. Have you tried recompiling 
>> everything from scratch using, say, Java 1.5? Make sure that you also 
>> rebuild some of the helper libraries (i.e. prp-util).
>>
>> Let me know if you have any other questions.
>>
>> Cheers,
>>   Peter

Thanks for the help.

The problem was that I was using jdk 1.6 and even though I cleaned and 
recompiled util-prp and ASync and copied the jar files to Pyxida/lib, it 
still failed with the same error message. But I downgraded to jdk 1.5.0_09 
and seems to be working fine now. I assume that some of the jar files in 
Pyxida/lib were compiled under jdk1.5.

One more question though. Why are there "update1" and "update2"? More 
specifically, why would CoordClient have two NCClient - a primaryNC and a 
secondaryNC?

Let's say there are two Pyxida clients - A and B. In an update, update1 
would refer to A and update2 would refer to B (B sends A a message). Is 
that a correct interpretation?

Thank you,

Eric

On Mar 11 2008, Peter Pietzuch wrote:

>Dear Eric,
>
>Eric Chan-Tin wrote:
>> I am interested in helping with the Pyxida project. I read a couple of 
>> papers about how network coordinate systems (for example GNP or Vivaldi) 
>> are insecure and wanted to implement some countermeasures against those 
>> attacks. Instead of creating my own Vivaldi implementation, I thought of 
>> just using Pyxida instead.
>
> It's great to hear that you want to help out with the Pyxida project. Let 
> me know when you have code to contribute and I'll set you up with 
> developer access.
>
>> [quote] WA 1205186886103 NetUtil : Could not deserialize java object: 
>> java.io.StreamCorruptedException: invalid type code: 80 WA 1205186886103 
>> ObjComm$ReadConnHa: No valid msgObject received from 
>> remoteAddr=<address>:55504. Ignoring. [\quote]
>
> Usually, deserialisation problems like this one indicate that class files 
> were compiled using different Java versions. Have you tried recompiling 
> everything from scratch using, say, Java 1.5? Make sure that you also 
> rebuild some of the helper libraries (i.e. prp-util).
>
>Let me know if you have any other questions.
>
>Cheers,
>   Peter
>

Sounds great, Eric.  Let Peter and me know how we can help.

-jonathan

On Mar 11, 2008, at 6:17 AM, Peter Pietzuch wrote:

> Dear Eric,
>
> Eric Chan-Tin wrote:
>> I am interested in helping with the Pyxida project. I read a couple  
>> of
>> papers about how network coordinate systems (for example GNP or  
>> Vivaldi)
>> are insecure and wanted to implement some countermeasures against  
>> those
>> attacks. Instead of creating my own Vivaldi implementation, I  
>> thought of
>> just using Pyxida instead.
>
> It's great to hear that you want to help out with the Pyxida  
> project. Let me
> know when you have code to contribute and I'll set you up with  
> developer access.
>
>> [quote] WA 1205186886103 NetUtil : Could not deserialize java object:
>> java.io.StreamCorruptedException: invalid type code: 80 WA  
>> 1205186886103
>> ObjComm$ReadConnHa: No valid msgObject received from
>> remoteAddr=<address>:55504. Ignoring. [\quote]
>
> Usually, deserialisation problems like this one indicate that class  
> files were
> compiled using different Java versions. Have you tried recompiling  
> everything
> from scratch using, say, Java 1.5? Make sure that you also rebuild  
> some of the
> helper libraries (i.e. prp-util).
>
> Let me know if you have any other questions.
>
> Cheers,
>   Peter
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> Pyxida-users mailing list
> Pyx...@li...
> https://lists.sourceforge.net/lists/listinfo/pyxida-users

Dear Eric,

Eric Chan-Tin wrote:
> I am interested in helping with the Pyxida project. I read a couple of 
> papers about how network coordinate systems (for example GNP or Vivaldi) 
> are insecure and wanted to implement some countermeasures against those 
> attacks. Instead of creating my own Vivaldi implementation, I thought of 
> just using Pyxida instead.

It's great to hear that you want to help out with the Pyxida project. Let me 
know when you have code to contribute and I'll set you up with developer access.

> [quote] WA 1205186886103 NetUtil : Could not deserialize java object: 
> java.io.StreamCorruptedException: invalid type code: 80 WA 1205186886103 
> ObjComm$ReadConnHa: No valid msgObject received from 
> remoteAddr=<address>:55504. Ignoring. [\quote]

Usually, deserialisation problems like this one indicate that class files were 
compiled using different Java versions. Have you tried recompiling everything 
from scratch using, say, Java 1.5? Make sure that you also rebuild some of the 
helper libraries (i.e. prp-util).

Let me know if you have any other questions.

Cheers,
   Peter

Hi Pyxida users/developers,

I am interested in helping with the Pyxida project. I read a couple of 
papers about how network coordinate systems (for example GNP or Vivaldi) 
are insecure and wanted to implement some countermeasures against those 
attacks. Instead of creating my own Vivaldi implementation, I thought of 
just using Pyxida instead.

However, I am having some problems starting up Pyxida. I don't know if this 
is the right place or not.

I created 8 instances of Pyxida on 8 separate machines with the bootstrap 
list being those 8 machines. All 8 Pyxida instances start up fine but give 
error messages after a while

[quote] WA 1205186886103 NetUtil : Could not deserialize java object: 
java.io.StreamCorruptedException: invalid type code: 80 WA 1205186886103 
ObjComm$ReadConnHa: No valid msgObject received from 
remoteAddr=<address>:55504. Ignoring. [\quote]

It seems like Pyxida is not able to parse the messages received. I am using 
ICMP = false since I do not have root access, so am unable to try Jpcap.

Any suggestions will be greatly appreciated. If this is not the right place 
to send this kind of email, please let me know the correct email address.

Thank you,

Eric

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Hello,

I am working on locating internet bottlenecks. Here is sthg i want to
discuss with you people.
I want to make an application like trace route AlterTraceRoute whom when i
run it provides me all the intermediate  Nodes alternative Server
Nodes(Overlay-nodes). What i want is that to assign each of my Intermediate
Router a Coordinate base upon ping or latency. How will i do that using
Pyxida (can I use it for assigning coordinate to intermediate Routers as
well as other servers between two end hosts). And How i can have the
SourceCode of the Pyxida. As i can't found the sourcecode on
http://pyxida.sourceforge.net/.

Thank you.

regards,
Sarfraz Raza
Research Associate
Computer Science Department
Lahore University of Management and Sciences

Hi all,

 I had a question about the Vivaldi simulator in the pyxida source code. I
didn't find any documentation for the vivaldi simulator in the cvs,
something that describes the various different tests that could be run using
this simulator, and the input/output format from the simulator. I found a
little bit of documentation in the syrah website, but that is for the old
code i believe.
Do you happen to have any documentation for this simulator that probably
didn't make it into the cvs for some reason?
Or, is the code itself the documentation? :) Some documentation will help me
a lot!

Thanks,
KP

Hi there,

Yang Chen wrote:
>     I am a visiting student at Microsoft Research Asia and focus on
> Network Coordinate research. Pyxida is a very useful tool for us. But
> today I find something may be wrong. I find that the version of Pyxida
> is upgrade to 1.0.4, but we can not download either pyxida-0.1.4.jar
> or pyxida-0.1.4.tar.gz from the website. It returns a HTTP 404 Error.
> Would you please have a look at this problem? Thank you very much!

Yes, sorry about that. We set some of the permissions incorrectly. It should be 
fixed now.

Let me know if there's anything else.

Cheers,
   Peter

Dear Pyxida Authors & Users,

    I am a visiting student at Microsoft Research Asia and focus on
Network Coordinate research. Pyxida is a very useful tool for us. But
today I find something may be wrong. I find that the version of Pyxida
is upgrade to 1.0.4, but we can not download either pyxida-0.1.4.jar
or pyxida-0.1.4.tar.gz from the website. It returns a HTTP 404 Error.
Would you please have a look at this problem? Thank you very much!

    Best regards,

Yours, Yang Chen

Does it work now?

-- prp

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