Chapter 4. Networking Configuration

Procedure 4.1. Set the TCP Send and Receive Windows

1. Adjust the Send and Receive Window Sizes

   Adjust the size of the send and receive windows by adding the following lines to the /etc/sysctl.conf file as root:
   1. Add the following line to set the send window size to the recommended value (640 KB):

      net.core.wmem_max=655360

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   2. Add the following line to set the receive window size to the recommended value (25 MB):

      net.core.rmem_max=26214400

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2. Apply Changes Immediately

   Optionally, to load the new values into a running kernel (without a reboot), enter the following command as root:

   # sysctl -p

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   If the user reboots after the first step, the second step is unnecessary.