IFX_NETBUF_SIZE environment variable

Use the IFX_NETBUF_SIZE environment variable to configure the network buffers to the optimum size. This environment variable specifies the size of all network buffers in the free (unused) global pool and the private network buffer pool for each database server session.

1  setenv IFX_NETBUF_SIZE size
is the integer size (in bytes) for one network buffer.
The default size is 4 KB (4,096 bytes). The maximum size is 64 KB (65,536 bytes) and the minimum size is 512 bytes. You can specify the value in hexadecimal or decimal form.
Tip: You cannot set a different size for each session.