Netopia R2121, Руководство пользователя

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11-2 User’s Reference Guide
IPX address
An IPX address consists of a network number, a node number, and a socket number. An IPX network number is
composed of eight hexadecimal digits. The network number must be the same for all nodes on a par ticular
physical network segment. The node number is composed of twelve hexadecimal digits and is usually the
hardware address of the inter face card. The node number must be unique inside the par ticular IPX network.
Socket numbers correspond to the par ticular ser vice being accessed.
Socket
A socket in IPX is the equivalent of a por t in TCP/IP. Sockets route packets to different processes within a
single node. Novell has reser ved several sockets for use in the NetWare environment:
Routing Information Protocol (RIP)
RIP, which was also derived from XNS, is a protocol that allows for the bidirectional transfer of routing tables
and provides timing information (ticks), so that the fastest route to a destination can be determined. IPX
routers use RIP to create and dynamically maintain databases of internetwork routing information. See the last
section in this chapter for more information on routing tables.
Service Advertising Protocol (SAP)
SAP is a protocol that provides ser vers and routers with a method to exchange ser vice information. Using SAP,
ser vers adver tise their ser vices and addresses. Routers collect this information to dynamically update their
routing tables and share it with other routers. These broadcasts keep all routers on the internetwork
synchronized and provide real-time information on accessible ser vers on the internetwork.
Field Value Packet Type Description
00h Unknown Packet Type Used for all packets not clas-
sified by any other type
01h Routing Information Packet Unused for RIP packets
04h Ser vice Adver tising Packet Used for SAP packets
05h Sequenced Packet Used for SPX packets
11h NetWare Core Protocol Packet Used for NCP packets
14h Propagated Packet Used for Novell NetBIOS