Configuring the TCP half open template
A feature that uses the TCP half open template performs the TCP half open operation to test whether the TCP service is available on the server. The TCP half open operation is used when the feature cannot get a response from the TCP server through an existing TCP connection.
In the TCP half open operation, the NQA client sends a TCP ACK packet to the server. If the client receives an RST packet, it considers that the TCP service is available on the server.
To configure the TCP half open template:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Create a TCP half open template and enter its view. | nqa template tcphalfopen name | By default, no TCP half open templates exist. |
3. (Optional.) Specify the destination IP address of the operation. |
| By default, no destination address is specified. |
4. (Optional.) Specify the source IP address for the probe packets. |
| By default, the packets take the primary IP address of the output interface as their source IP address. The source IP address must be the IP address of a local interface, and the interface must be up. Otherwise, no probe packets can be sent out. |
5. (Optional.) Specify the next hop IP address for the probe packets. |
| By default, the IP address of the next hop is configured. |
6. (Optional.) Configure the probe result sending on a per-probe basis. | reaction trigger per-probe | By default, the probe result is sent to the feature that uses the template after three consecutive failed or successful probes. If you execute the reaction trigger per-probe and reaction trigger probe-pass commands multiple times, the most recent configuration takes effect. If you execute the reaction trigger per-probe and reaction trigger probe-fail commands multiple times, the most recent configuration takes effect. |