Configuring TCP Connection Establishment

To establish connections, TCP uses a three-way handshake during which two peers exchange TCP SYN messages to request and confirm the active open connection. In attempting this connection, one peer retransmits the SYN messages for a defined period of time if it does not receive acknowledgement from the terminating peer. You can configure the amount of time in seconds between the retries as well as how long (in seconds) the peer will keep retransmitting the messages.

You set two new options in the network parameters configuration to specify these amounts of time: atcp-syn-rxmt-interval and atcp-syn-rxmt-maxtime.

Note that for all configured options, any values entered outside of the valid range are silently ignored during configuration and generate a log when you enter the activate command.

To configure TCP connection establishment:

1. In Superuser mode, type configure terminal and press Enter.

   ORACLE# configure terminal

2. Type system and press Enter.

   ORACLE(configure)# system
   ORACLE(system)#

3. Type network-parameters and press Enter.

   ORACLE(system)# network-parameters
   ORACLE(network-parameters)#

4. options—Set the options parameter by typing options, a Space, the option name atcp-syn-rxmt-interval=x (where x is a value in seconds between 2 and 10) with a plus sign in front of it. Then press Enter. This value will be used as the interval between TCP SYN messages when the Oracle® Enterprise Session Border Controller is trying to establish a connection with a remote peer.

   Now enter a second option to set the maximum time for trying to establish a TCP connection. Set the options parameter by typing options, a Space, the option name atcp-syn-rxmt-maxtime=x (where x is a value in seconds between 5 and 75) with a plus sign in front of it. Then press Enter.

   ORACLE(network-parameters)# options +atcp-syn-rxmt-interval=5
   ORACLE(network-parameters)# options +atcp-syn-rxmt-maxtime=30

   If you type the option without the plus sign, you will overwrite any previously configured options. In order to append the new options to the configuration’s options list, you must prepend the new option with a plus sign as shown in the previous example.

   Note:

   atcp-syn-rxmt-maxtime=x option is equivalent to the tcp-keepinit-timer parameter, but only affects ATCP.
5. Save and activate your configuration.