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Topic: Sequenced packet exchange

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	An Inside Look at SPX Communications between RPRINTER/ NPRINTER and the NetWare Print Server
		An analysis of these packets provides an inside look at the information that is exchanged when the remote printer module initially connects to the print server, when a print job is sent to the print server, and when the print services connection is in an idle state.
		Packet 871 is in response to the data sent to the print server in Packet 869, which told the print server that NPRINTER had one empty buffer.
		Packet 873 is a system packet that is an acknowledgement to Packet 871, when NPRINTER received new data from the print server and the print server sent a Send ACK call in the Connection Control field.
	support.novell.com /techcenter/articles/ana19951203.html (8097 words)

	Protocols
		To move a packet to the proper node on a network, a medium-access control (MAC) header is placed at the beginning of every packet.
		Any packets IPX receives that are addressed to that socket are passed on to the corresponding process.
		A response packet can be either a reply to a request from a router or workstation or a periodic broadcast by a router.
	docsrv.sco.com:507 /en/NetAdminG/ipxC.protocols.html (2609 words)

	IPX network protocol, ipx sap, novell netware network
		At the network layer the Internetwork Packet Exchange (IPX) is used to provide a connectionless service, and at the transport layer Sequenced Packet Exchange (SPX) is used for services requiring connections.
		Normally the maximum packet size when going through a router is 576 bytes, however LIP has a limit of 4202 bytes although this is configurable downwards dependant on the physical interface.
		Bay Networks routers use a boxwide services table rather than a bindery and when the router receives a SAP packet, it compares the contents to that of the service table and resets the age timer to zero if there is a match, or adds the new entry.
	www.rhyshaden.com /ipx.htm (3576 words)

	Protocol: IPX ( Internet Packet Exchange ) (Site not responding. Last check: 2007-09-10)
		IPX makes a best effort attempt to deliver packets to their destination; there is no guarantee or verification of successful delivery.
		If zero (0) is used for the network address, the packet is sent to the network to which the source host is connected.
		Packets with a network address of zero (0) are typically used to query SAP for the address and name of the nearest server.
	www.protocolbase.net /protocols/protocol_IPX.php (1907 words)

	Networking PCs With TCP/IP: Netware and TCP\IP
		It provides packet sequencing information to ensure that packets arrive in order, and it requires acknowledgement of the packets received to guarantee that all packets are delivered.
		The receiving station uses this field to check that it is receiving packets in the proper order and that it has received all packets.
		Packets are sent directly to and received directly from the DSS server.
	www.oreilly.com /catalog/netpc/excerpt/ch11.html (8704 words)

	NetWare Protocols
		Internetwork Packet Exchange (IPX) is the original NetWare network layer (Layer 3) protocol used to route packets through an internetwork.
		The Sequenced Packet Exchange (SPX) protocol is the most common NetWare transport protocol at Layer 4 of the OSI model.
		The IPX packet is the basic unit of Novell NetWare internetworking.
	www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/netwarep.htm (1860 words)

	[No title]
		Under the normal circumstances, the packet ultimately arrives at a router directly connected to the destination station and the packet is delivered.
		The Sequenced packet Exchange (SPX) is Novell's transport layer protocol and was derived from Xerox's Sequenced Packet Protocol (SPP).
		The SAP packet is put in the data area of the IPX packet, and the scoket address of 452h is used to identify if as an SAP packet.
	www.ecst.csuchico.edu /~prem/298C.html (4394 words)

	TCP/IP
		Packet is sent from router to router via best path according to routing tables, based on destination network number.
		A mask is a binary 32 bit number that has a '1' in all bit positions that have to be examined in a packet IP address and '0' in all bit portions that don't have to be examined, to determine what is the 'network' portion of the address.
		You see, when a packet is to be allowed into the network or subnetwork by a router, the router has to find if the network portion of the datagram address coincides with its own.
	www.sce.carleton.ca /netmanage/dcommTutorials/scan05/scan05.html (2801 words)

	Novell SPX: Sequenced Packet Exchange protocol
		The Sequenced Packet Exchange (SPX), is Novell's legacy transport layer protocol providing a packet delivery service for Novell NetWare network.
		SPX prepares the sequence of packets that a message is divided into and manages the reassembly of received packets, confirming that all have been received and requesting retransmission when they haven"t.
		SPX works directly with the Internetwork Packet Exchange (IPX), which manages the forwarding of packets in the network.
	www.networkdictionary.com /protocols/spx.php (386 words)

	The Networking Essentials
		To insulate the transmission from the other ports, the switch establishes a temporary connection between the source and destination, and then terminates the connection when the conversation is done.
		Layer 3 protocols are designed to handle the tasks of route determination, packet fragmentation and reassembly, address assignment on the network level (such as IP), and packet forwarding.
		Simply put, over Ethernet, a user can send data packets only when no other packets are traveling on the network—when the network is "quiet." Otherwise, it waits to transmit, as a person might wait for another to speak during a conversation.
	www.unc.edu /~bfleming/NetEs.htm (5026 words)

	Lesson 3: NetWare Protocols (Site not responding. Last check: 2007-09-10)
		After the packet has been transmitted and is on the media, each network card checks the address; if their address matches the destination address on the packet, or, if the packet is a broadcast message, the NIC copies the packet and sends it up the protocol stack.
		With the CRC appended to the packet, it is virtually certain that all the packets will be free of corruption.
		However, in RIP, an extra field of data was added to the packet to improve the decision criteria for selecting the fastest route to a destination.
	pluto.ksi.edu /~cyh/cis370/ebook/ch06d.htm (1110 words)

	Internetwork Packet eXchange (Site not responding. Last check: 2007-09-10)
		IPX packets are encapsulated and carried by the packets used in Ethernet and the frames used in Token Ring networks.
		IPX packets consist of a 30-byte header which includes the network, node, and socket addresses for the source and the destination, followed by the data area, which can be from 30 bytes (only the header) to 65,535 bytes in length.
		Packet length Length of the packet in bytes
	www.coffeycountyks.org /Terms/2461HTML-1400.html (188 words)

	Microsoft Security Bulletin (MS00-054)
		Routers frequently are configured to drop IPX packets, and if such a router lay between the malicious user and an affected machine, he could not attack it.
		As discussed in the FAQ, the most likely scenario in which this vulnerability could be exploited would be one in which a malicious user on an intranet would attack affected machines on the same intranet, or one in which a malicious user on the Internet attacked affected machines on his cable modem or DSL subnet.
		When one machine needs to "ping" another machine, it sends a data packet that indicates the source and destination address (among other information), and indicates that a Ping is being requested.
	www.microsoft.com /technet/security/bulletin/MS00-054.mspx (2115 words)

	IPX/SPX (Internetwork Packet Exchange/Sequenced Packet Exchange) (Linktionary term)
		Its basic operation is similar to IP (Internet Protocol), but its addressing scheme, packet structure, and general scope are different.
		The other member of the Novell NetWare protocol suite is SPX (Sequenced Packet Exchange), which resides in the transport layer.
		SAP is similar to RIP in that it enables network devices to exchange information about their availability on the network.
	www.linktionary.com /i/ipx.html (615 words)

	Internetworking Technology Overview
		When a device to be communicated with is located on a different network, IPX routes the information to the destination through any intermediate networks.
		When the value of this field reaches 15, the packet is discarded under the assumption that a routing loop might be occurring.
		Sequenced Packet Exchange (SPX) is the most commonly used NetWare transport protocol.
	www.delmar.edu /Courses/ITCC1306/Internetworking/55164.htm (1355 words)

	Chapter 8: IPX Protocol Stack
		Describe the purpose of Internetwork Packet Exchange (IPX) and Sequenced Packet Exchange (SPX).
		Packets are addressed to communicate directly with specific services on servers and nodes.
		If the CSNP has new information, the receiving router sends a Partial Sequence Number Packet (PSNP) to the DR, which is a request for the details of the new information.
	home.att.net /~s.k.vincent/2502_8.htm (1343 words)

	Network Chemistry - The Wireless Security Experts
		Ethereal is used by network professionals around the world for troubleshooting, analysis, software and protocol development, and education.
		Packetyzer can only capture 802.11 packets directly when using a WSP100, Neutrino or WildPackets RFGrabber.
		To allow SNMP packets conforming to an unsupported MIB to be decoded, copy the MIB, and any dependent MIBs, to the snmp/mibs directory where Packetyzer was installed.
	www.networkchemistry.com /products/packetyzer (802 words)

	Novell NetWare protocol suite - IPX \| RIPX \| BCAST \| DIAG \| SER \| WDOG \| SPX \| SAP \| NovelNetBIOS \| BMP \| NCP \| NDS \| ... (Site not responding. Last check: 2007-09-10)
		To ensure that a single version of NetWare is not being loaded on multiple servers, the operating system broadcasts copy-protection packets, called Serialization packets, to determine whether there are multiple copies of the same operating system on the network.
		Number used by the workstation and file server to identify packets which are sent and received.
		It is a protocol for information exchange among routers geared to the needs of large IPX networks.
	www.protocols.com /pbook/novel.htm (1620 words)

	Microsoft Security Bulletin (MS00-073): Frequently Asked Questions
		The vulnerability causes the affected systems to handle a received NMPI packet inappropriately if the source network address in the packet equals the destination address.
		Like most networking protocols, IPX provides the ability to send a packet to specific machines in the network by addressing it with the appropriate network address.
		In this vulnerability, however, the malicious user wouldn't send a malformed packet to the broadcast address - instead, he would provide the broadcast address as the source address.
	www.microsoft.com /technet/security/bulletin/fq00-073.mspx (1371 words)

	RFC 1707 - CATNIP: Common Architecture for the Internet
		At the same time, the packet format of the connectionless service is retained, and hop by hop fully addressed datagrams can be used at the same time.
		On very slow and low performance networks, the fixed header is still fairly small, and could be further compressed by methods similar to those used with IP version 4 on links that consider every bit precious.
		Novell IPX The Internetwork Packet Exchange protocol, developed by Novell based on the XNS protocol (Xerox Network System) has many of the same capabilities as the Internet and OSI protocols.
	www.packetizer.com /rfc/rfc1707 (4653 words)

	Network Protocols
		IP may fragment (packetize) the data it is carrying into smaller parts if necessary and reassemble it at a router or the destination station.
		IPX (Internetwork Packet Exchange) is a connectionless network layer protocol based on XNS’s IDP (Internetwork Datagram Protocol) The primary function of IPX is the delivery of packets from node to node in an internetwork.
		ASP (Appletalk Session Protocol) Insures that packets are sequenced correctly before passing the message to upper layer protocols.
	www.unc.edu /~dbr/inls182/protocols.htm (888 words)

	cMcProtocols
		IPX works at the network layer of communication protocols and is connectionless (that is, it doesn't require that a connection be set up before packets are sent to a destination as, for example, a regular voice phone call does).
		Packet acknowledgment is managed by another Novell protocol, the Sequenced Packet Exchange™ (SPX).
		Another disadvantage is that IPX/SPX is a "chatty" protocol, in that each packet transmitted must be acknowledged by the receiving node.
	home.att.net /~charlie.net/cmcproto.htm (1519 words)

	ABXZone.com - Securing Windows XP
		Unlike static packet filtering, which examines a packet based on the information in its header, stateful inspection tracks each connection traversing all interfaces of the firewall and makes sure they are valid.
		An example of a stateful firewall may examine not just the header information but also the contents of the packet up through the application layer in order to determine more about the packet than just information about its source and destination.
		Because of this, filtering decisions are based not only on administrator-defined rules (as in static packet filtering) but also on context that has been established by prior packets that have passed through the firewall.
	www.abxzone.com /abx_reviews/tweak_al/secure_p13.html (931 words)

	IPX :: Internetwork Packet Exchange
		IPX / Internetwork Packet Exchange is a networking protocol from Novell NetWare used for packet routing and forwarding.
		IPX / Internetwork Packet Exchange is a routable protocol
		Acknowledgement of packets received is handled by the Novell protocol SPX / Sequenced Packet Exchange.
	www.inforingpress.com /computer-careers/ipx.htm (368 words)

	What is IPX? - a definition from Whatis.com - see also: Internetwork Packet Exchange
		IPX (Internetwork Packet Exchange) is a networking protocol from Novell that interconnects networks that use Novell's NetWare clients and servers.
		IPX works at the Network layer of communication protocols and is connectionless (that is, it doesn't require that a connection be maintained during an exchange of packets as, for example, a regular voice phone call does).
		Packet acknowledgment is managed by another Novell protocol, the Sequenced Packet Exchange (
	whatis.techtarget.com /definition/0,289893,sid9_gci214038,00.html (160 words)

	IPX/SPX (Site not responding. Last check: 2007-09-10)
		SAP - Service Advertising Protocol packets are used by file and print servers to periodically advertise the address of the server and the services available.
		SPX - Sequenced Packet Exchange operates at the transport layer providing connection oriented communication on top of IPX.
		IPX - Internetwork Packet Exchange supports the transport and network layers of the OSI network model.
	www.comptechdoc.org /independent/networking/guide/netipxspx.html (251 words)

	XCLN: RPC Ping Utility and Exchange 2000 Server
		You can use the RPC Ping utility to confirm the remote procedure call (RPC) connectivity between the Exchange 2000 server and any of the supported Messaging Application Programming Interface (MAPI) clients on the network.
		You can also use the RPC Ping utility to verify that Exchange 2000 services are responding to RPC requests from clients across the network.
		To use the RPC Ping utility, you must run Rpings.exe on the Exchange Server computer and Rpingc.exe on the MAPI client computer.
	support.microsoft.com /default.aspx?scid=kb;en-us;272218 (430 words)

	Microsoft Windows 9x / Me IPX NMPI Packet DoS Vulnerability
		If NWLink (which enables Microsoft Windows to interoperate with Novell stations) is enabled on a Windows 9x or ME system, it is possible to create broadcast storms which could severely impede upon network operations or cause certain targeted machines to fail.
		IPX/SPX (Internetworked Packet Exchange/Sequenced Packet Exchange) is the protocol implemented by NWLink and periodically sends out broadcast messages across a network.
		Sending this type of packet would create a broadcast storm because every affected machine would respond to the broadcast address, that is, the entire network.
	www.securityfocus.com /bid/1781/discuss (216 words)

	Cisco Sem3 Lesson 7 - Novell IPX
		IPX (Internetwork Packet Exchange) - NetWare network layer (Layer 3) protocol used for transferring data from servers to workstations.
		SPX (Sequenced Packet Exchange) - Reliable, Transport Layer (Layer 4) connection-oriented protocol that supplements the datagram service provided by Network layer (Layer 3) protocols.
		An IPX network client issues a GNS request to solicit either a direct response from a connected server or a response from a router that tells it where on the internetwork the service can be located.
	www.delmar.edu /Courses/ITSC1391/Sem3/7Novell_IPX.htm (1364 words)

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