[Planetlab-users] limit on number of connections to a port

[Ioan Raicu]

If you do a "ulimit -a", you will get the OS specific limits; most 
likely, your open file descriptors are limited to 1024 (per process)... 
but this can be raised with the ulimit command.  On a dual Opteron 
system running SuSe Linux 9, I was able to get 60K+ concurrent TCP 
connections.... which got pretty close to the fundamental limits of 64K 
ports (8 bit value).
Ioan

Neil Spring wrote:
> If by "connections" you mean TCP connections, then yes, your 
> application can only have as many connections as file descriptors 
> (sockets) allocated by the kernel.  (4,000-ish, I think, though people 
> who have run into this limit are more likely to know).
>
> I don't think you're giving enough precise information for a smarter 
> answer.  Information like which system call fails with what errno 
> value (perhaps from strace) would be helpful, but likely much more is 
> required.
>
> -neil
>
>
> On Oct 4, 2006, at 3:00 AM, Parul Halwe wrote:
>
>>
>> Hello All,
>>         Is there any limit on number connections that can be made to 
>> a particular port? I am developing an application that requires 
>> sending data packets. Initially everything works fine but after some 
>> time I am not able to establish connection to that port.
>>
>> Thanks and Regards,
>> Parul Halwe
>>
>> --Parul Halwe
>> Student
>> M.Tech - 2nd Year
>> Computer Science and Engg. dept.
>> IIT Bombay
>>
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>
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-- 
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Ioan Raicu
Ph.D. Student
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Distributed Systems Laboratory
Computer Science Department
University of Chicago
1100 E. 58th Street, Ryerson Hall
Chicago, IL 60637
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Email: iraicu at cs.uchicago.edu
Web:   http://www.cs.uchicago.edu/~iraicu
       http://dsl.cs.uchicago.edu/
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