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IPX and SPX span the layer 3 and layer 4 protocol functions in OSI terms and, as such, do have fields in the header for network numbers IPX is a connectionless datagram protocol, similar in many ways to IP; SPX provides connection-oriented delivery similar to TCP A packet containing an IPX destination and source address also will contain the MAC destination and source in the layer 2 header, as previously described for TCP/IP communications The major difference between NetWare and TCP/IP implementations is that on a NetWare LAN, you assign a network number for a given segment and all nodes use their MAC address in combination with this network number to generate their own station address In TCP/IP every workstation is given an IP address, and the network number is derived from that value and any subnet masks applied The IPX header always starts with the hexadecimal value FFFF The IPX header is somewhat similar to an IP header, carrying essentially the same information The key information carried is as follows: Destination network, node and socket numbers

second octet (binary)

0 00000000 01111111 10111111 11000000

The first limitation that should be noted is the need to filter by address This means that packet filters are vulnerable to someone impersonating an address so that the packets sent from their machine appear to have originated from a machine you trust Unfortunately, this is a fairly easy procedure The upside is that in order to actually complete a connection, the originator of the

third octet (binary)

.

0 00000000 11111111 11111111 00000000

fourth octet (binary)

0 00000000 11111110 11111110 00000000

.

10127255254 10191255254

Source network, node and socket numbers Transport Control byte Length of IPX header and data These are fairly self-explanatory, except for the Transport Control byte To propagate route information, IPX uses a version of RIP that closely resembles that implemented by the Xerox Networking System As with other RIP implementations, the maximum number of hops a packet is allowed to traverse is 15, and the 16th router will discard the packet When a packet is originated, this value is set to 0 and is incremented as the packet passes through each successive IPX router As you can see, the IPX Transport Control byte performs the same function as the IP Time To Live field The destination network value is obvious; however, this value is set to 00-00-00 if the destination server is on the same network number as the client sending the packet The destination node address has a differing value depending on whether a NetWare client or server is sending the packet If the packet was sent by a server, it will contain the destination workstation's MAC address, and if it was sent by a workstation to a server, it will contain the value 00-00-00-00-00-01 It must be noted that the MAC information in the layer 2 header will contain the appropriate MAC address for the destination machine, whether that is a server or a workstation Source and destination sockets are used in IPX/SPX communications in the same way as in TCP/IP, ie, a socket identifies the address of a program running in a machine SPX adds additional fields to the layer 3 header, which include source and destination connection IDs, and sequence and acknowledgment numbers Since SPX operates as a connection-oriented protocol, it operates on a handshake principle to initiate and close connections, similar to TCP With SPX, a constant stream of traffic between the client and server is generated by the protocol and is independent of any user data that needs to be transmitted between the two This stream of traffic uses timers to decide when to re-request responses if none are received The timers you may wish to adjust on the workstation or server software are: SPX listen timeout SPX verify timeout SPX abort timeout SPX Ack wait timeout SPX watchdog verify timeout.

You have now calculated all of the information required to configure the two physical network segments that you have created The following table summarizes the configuration for each of the two network segments, and Figure 5-2 displays how these two network segments will be configured

106401 1012801