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Old 08-18-2008, 12:39 PM   #1
ayhanne
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Registered: Aug 2008
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Ghost connection


Hi,

I'm just new in linux. Can you please help me how I can check the ghost connection on linux? I'm using netstat -a to check the status of connection of each of our clients. There's one incident that one of our client disconnects without informing us. On our side we still can see that the status of connection of that client is ESTABLISHED even when the client already disconnected. How can we check if there are ghost connections? Why we didn't see the status as close_wait or time_wait or other status? Is there a way we can configure the settings on linux to display time_wait, close_wait or other connection status that will tell us that the client was disconnected?

Here's the version of our linux server:
Linux das 2.6.9-34.ELsmp #1 SMP Fri Feb 24 16:54:53 EST 2006 i686 i686 i386 GNU/Linux

Thanks in advance! I hope you can help me.
 
Old 08-19-2008, 04:37 AM   #2
blackhole54
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Registered: Mar 2006
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Hi.

Welcome to Linux.

Quote:
Originally Posted by ayhanne View Post
On our side we still can see that the status of connection of that client is ESTABLISHED even when the client already disconnected. How can we check if there are ghost connections? Why we didn't see the status as close_wait or time_wait or other status? Is there a way we can configure the settings on linux to display time_wait, close_wait or other connection status that will tell us that the client was disconnected?
TMK the netstat command by default will show TIME_WAIT after the connection has been closed. I am not sure if the length of time is configurable or not. If you are not seeing it, my guess is that the remote host didn't actually do the handshake to terminate the connection. (You could check this by running a packet sniffer such as tcpdump or Wireshark.)

You might get some more knowledgable responses to you post if you request that this thread be moved to the networking forum. (Please don't double post!) You can do that by clicking the REPORT button at the bottom (near the EDIT and QUOTE buttons) of your post.
 
  


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