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Top Forums Shell Programming and Scripting netstat command Post 302572453 by vbe on Thursday 10th of November 2011 04:24:42 AM
UNIX servers usually have default network TIMEOUT set to values that were from the times of 10Mb networks... In other words the times when you could unplug and move around cables without taking too much risks of seeing the server crashing (complaining at the most) then came interconnection with WIN.. serversin multi-tier environment and users on PCs with 100Mb/1GB lan interfaces and things changed a bit: admins started to have strange issues where people couldn't connect anymore, application were no more responding... due to no more sockets etc... because e.g for the case of PCs, when no more activity for a little time the PC closed the connection and when activity started again -opened a new one... On the UNIX side though the connection did not get the close request and stayed in a zombiesque state till the server cleared the TIMEOUTs. We were talking of second on one side and minutes on the other...
So your understanding is correct...
It shows that things you write that work may still be buggy... And needs to be tested thoroughly and be sure of the correctness of code (you open an ftp session - you closed it behind...) for even if the code is perfect the usage of it may have side effects:
Now you code is correct. What will happen if you send hundreds of parallel sessions with big transfer? We had one case where all the switches dropped in cascade...

Have a good day
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