Vxworks网络编程手册资源-CSDN文库

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Vxworks网络编程手册（158个子文件）

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共 158 条

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <html> <head> <link rel="STYLESHEET" type="text/css" href="wrs.css"> <title> Data Link Layer Network Components </title> </head> <body bgcolor="FFFFFF"> <a href="index.html"><img border="0" alt="[Contents]" src="icons/contents.gif"></a><a href="c-dll.html"><img border="0" alt="[Index]" src="icons/index.gif"></a><a href="c-dll.html"><img border="0" alt="[Top]" src="icons/top.gif"></a><a href="c-dll3.html"><img border="0" alt="[Prev]" src="icons/prev.gif"></a><a href="c-dll5.html"><img border="0" alt="[Next]" src="icons/next.gif"></a> <h3 class="H2"><a name="84371">3.4   PPP, the Point-to-Point Protocol for Serial Line IP</a></h3> <dl class="margin"> <dl class="margin"> <dd><a name="93952"> </a>The VxWorks implementation of the PPP (Point-to-Point Protocol) is comprised of several different protocols that work together with the PPP network interface driver. Although PPP can, in theory, support a variety of protocols, the VxWorks implementation supports only the TCP/IP stack. The VxWorks PPP implementation is comprised of three main components: </dl> <dl class="margin"> <ul class="Bullet" type="disc"><li><a name="93953"> </a>A method for encapsulating multi-protocol datagrams.</li></ul> <ul class="Bullet" type="disc"><li><a name="84376"> </a>A Link Control Protocol (LCP) for establishing, configuring, and testing the data-link connection.</li></ul> <ul class="Bullet" type="disc"><li><a name="84378"> </a>A family of Network Control Protocols (NCPs) for establishing and configuring different network-layer protocols.</li></ul> </dl> <dl class="margin"> <dd><a name="93965"> </a>PPP is one method by which VxWorks can communicate with other operating systems over a serial line connection. PPP supports Internet Protocol (IP) layer networking software over point-to-point configurations, such as long-distance telephone lines or RS-232 serial connections between machines. If either end of a PPP connection has other network interfaces (such as Ethernet) and is able to forward packets to other machines, a PPP connection can serve as a gateway between networks. <dd><a name="93966"> </a>The basic functionality provided by PPP is similar to that of the Serial Line Internet Protocol (SLIP), with the advantage that PPP is extensible and offers various configurable options. <dd><a name="84381"> </a>PPP provides a standard method for transporting multi-protocol datagrams over point-to-point links. It is designed for simple links which transport packets between two peers. These links provide full-duplex, simultaneous operation and are assumed to deliver packets in the order in which they are sent. It is intended that PPP provide a common solution for easy connectivity among a variety of hosts, bridges, and routers. </dl> </dl> <h4 class="H3"><a name="84382">3.4.1   Reference Material on PPP</a></h4> <dl class="margin"> <dl class="margin"> <dd><a name="84384"> </a>The following is a list of relevant Requests for Comments (RFCs) associated with the VxWorks PPP implementation: <dl class="margin"> <dd><div class="Indent"><a name="84385"> </a>RFC 1332: The PPP Internet Protocol Control Protocol (IPCP)</div> <dd><div class="Indent"><a name="84387"> </a>RFC 1334: PPP Authentication Protocols</div> <dd><div class="Indent"><a name="84389"> </a>RFC 1548: The Point-to-Point Protocol (PPP)</div> </dl> <dd><a name="84392"> </a>The USENET news group, comp.protocols.ppp, is dedicated to the discussion of PPP-related issues. Information presented in this forum is often of a general nature (such as equipment, setup, or troubleshooting), but technical details concerning specific PPP implementations are discussed as well. </dl> </dl> <h4 class="H3"><a name="84394">3.4.2   PPP Features</a></h4> <dl class="margin"> <dl class="margin"> <dd><a name="84395"> </a>PPP supports the following features: </dl> <dl class="margin"> <ul class="Bullet" type="disc"><li><a name="84397"> </a>PPP client and server connection support (either active or passive mode). In active mode (default), the PPP software attempts to initiate a PPP link with the peer. In passive mode, the PPP software waits for a peer to try to open a link.</li></ul> <ul class="Bullet" type="disc"><li><a name="84399"> </a>Multiple unit support. Up to 16 PPP interfaces can be active at any one time.</li></ul> <ul class="Bullet" type="disc"><li><a name="84401"> </a>Asynchronous character mapping. Users can specify control characters that should be escaped by the peer upon transmission to avoid misinterpretation by the serial driver library or by lower-level modem software.</li></ul> <ul class="Bullet" type="disc"><li><a name="84403"> </a>Van Jacobsen (VJ) compression. This feature reduces the regular 40-byte TCP/IP header to 3 or 8 bytes, thereby saving valuable link bandwidth.</li></ul> <ul class="Bullet" type="disc"><li><a name="84405"> </a>Address, control, and protocol field compression. These types of compression allow the PPP network interface driver to reduce the transmission of extraneous PPP header information, thereby saving valuable link bandwidth.</li></ul> <ul class="Bullet" type="disc"><li><a name="84407"> </a>Link state and link statistics querying. Internal PPP counters and protocol state information may be obtained through query routines. This enables applications to monitor and manage the PPP link.</li></ul> <ul class="Bullet" type="disc"><li><a name="84409"> </a>IP address negotiation. Using IP address negotiation, one peer may assign the other peer an IP address once the PPP link is established.</li></ul> <ul class="Bullet" type="disc"><li><a name="84411"> </a>Echo request and reply. One peer may request that the other peer respond to link-layer echoes. This allows for an automatic monitoring of the link's physical status.</li></ul> <ul class="Bullet" type="disc"><li><a name="84413"> </a>Connect and disconnect hooks. Use of connect and disconnect hooks allows applications to implement routines supporting modem control, dialing software, connection scripting, etc.</li></ul> <ul class="Bullet" type="disc"><li><a name="84415"> </a>Challenge-Handshake Authentication Protocol (CHAP) and Password Authentication Protocol (PAP)</fo

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