NetIPC 3000/XL Programmer's Reference Manual (5958-8600)

114 Chapter3
NetIPC Intrinsics
IPCRECVCN
receive size is 100 bytes.
HP 3000 to PC NetIPC Checksumming — With PC NetIPC, the
TCP checksum option cannot be turned on. But if the HP 3000 requires
it, the TCP checksum is in effect on both sides of the connection. On the
HP 3000, enabling/disabling checksumming with NetIPC intrinsics
allows you to override the checksumming decision made during
network transport configuration for this particular process.
Send and receive size — The HP 3000 send and receive size range is
1 to 30,000 bytes. The PC send and receive size range is 1 to 65,535
bytes. Although the ranges are different, cross-system communication
is not affected. If you specify a send or receive size, be sure it is within
the correct range for the respective system. For example, if the PC node
sends 60,000 bytes, the HP 3000 node can call IPCRECV twice, receiving
30,000 bytes the first time and the second 30,000 bytes the second time.
Note that the default send and receive sizes are different on different
HP systems. On the HP 3000, the default send and receive size is less
than or equal to 1,024 bytes.