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Source port on AIX for NAS is same?

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Old 4 Weeks Ago
bakunin bakunin is offline Forum Staff  
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Originally Posted by anil1000 View Post
How to keep it alive? What do you mean by this, which connection to keep it alive? Kindly suggest..
In regular intervals packets are sent in an existing connection to make sure the partner still is there. These packets are called "keepalive" packets. If these packets are not received the partner assumes that the other side went dead and closes the connection.

Think of a connection like a telephone call: when you talk to someone you expect some sort of acknowledgement that the other is still listening at times, be it "aha" or "hmm" or something such. If you don't get that you may ask "are you still there" - and if there is no answer you hang up. This is quite the same mechanism.

I hope that helps.

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Old 4 Weeks Ago
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In addition to what Bakunin said:
A firewall drops or rejects a connection after a certain period if there is no activity.
A keep-alive message can be sent as a null packet periodically by the client to keep a service alive. This keeps the firewall from dropping the connection. Of course if this is done liberally by every host for every connection then the connection table in the firewall would become too long. That is why some firewalls detect this behavior and ignore keepalives messages.
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