How is current Established connection calculated on Netscaler vserver/service
Article ID: CTX584250
Updated On:
Description
This article illustrates how the established connections are calculated under Netscaler vserver/service monitoring.
Instructions
Citrix Netscaler has followed the RFC793 strictly on TCP connection. TCP state machine defined the below 8 statuses.
| LISTEN - represents waiting for a connection request from any remote TCP and port. SYN-SENT - represents waiting for a matching connection request after having sent a connection request. SYN-RECEIVED - represents waiting for a confirming connection request acknowledgment after having both received and sent a connection request. ESTABLISHED - represents an open connection, data received can be delivered to the user. The normal state for the data transfer phase of the connection. FIN-WAIT-1 - represents waiting for a connection termination request from the remote TCP, or an acknowledgment of the connection termination request previously sent. FIN-WAIT-2 - represents waiting for a connection termination request from the remote TCP. CLOSE-WAIT - represents waiting for a connection termination request from the local user. CLOSING - represents waiting for a connection termination request acknowledgment from the remote TCP. |
An established connection can include both active and idle state of connections. In other words, the connections that have a successful TCP 3way handshake completed and before sending a FIN packet to the other side are counted as an established connection.
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