RawIpOpen

This procedure tells the TCP/IP address space that the client wants to send and receive packets of the specified protocol. Figure 1 shows an example.

Do not use protocols 6 and 17. They specify the TCP (6) and UDP (17) protocols. When you specify 6, 17, or a protocol that has been opened by another address space, you receive the LOCALportNOTavailable return code.

Figure 1. RawIpOpen example

   procedure RawIpOpen
            (
                 ProtocolNo: integer;
        var    ReturnCode: integer
            );
            external;

Parameter

Description

ProtocolNo

The number of the Internet protocol.

ReturnCode

Indicates success or failure of a call. Possible return values are:

OK
LOCALportNOTavailable
NObufferSPACE
NOTyetBEGUN
SOFTWAREerror
TCPipSHUTDOWN
UNAUTHORIZEDuser

For a description of Pascal return codes, see Table 1.

Note: You can open the ICMP protocol, but your program receives only those ICMP packets not interpreted by the TCP/IP address space.