Configuring IBM i TCP Buffers

To change or tune the TCP/IP buffer sizes (TCPRCVBUF, TCPSNDBUF), please follow the below steps.

1. Login to IBM i using QSECOFR user profile
2. Change the TCP/IP configuration
1. Run the Change TCP/IP Attribute, CHGTCPA
2. View and change the buffer sizes by pressing F4 on the Change TCP/IP Attributes window. The buffer sizes are displayed as the TCP receive and send buffer sizes. Type new values and save the changes.
3. Recycle or restart TCP/IP for the changes to take effect, then monitor CPU and paging rates to determine if they are within recommended system guidelines.