全析PPP Options选项设置

对于一个网络协议来说，我们不仅仅要了解它的定义和概念，更要清楚它的设置与应用。那么今天我们就主要讲解一下关于PPP Options 的相关内容，来帮助大家了解一下具体的选项配置。

Selecting PPP Options Using an Options Structure

PPP options may be set at run-time by filling in a PPP options structure and passing the structure location to the ppp Init( ) routine. This routine is the standard entry point for initializing a PPP link (see Initializing a PPP Link).

The PPP options structure is typedefed to PPP_OPTIONS, and its definition is located in h/netinet/ppp/options.h, which is included through h/pppLib.h.

PPP选项可以在运行的时候设置，设置PPP选项结构体并将这个结构体传给pppInit()函数。这个函数是初始化PPP连接的标准入口点(请参考初始化PPP连接)。

The first field of the structure is an integer, flags, which is a bit field that holds the ORed value of the OPT_option macros displayed in column 2 of Table 3-3. Definitions for OPT_option are located in h/netinet/ppp/options.h. The remaining structure fields in column 2 are character pointers to the various PPP options specified by a string.

选项结构体的第一个域是整型数，一个标志位，是几个 OPT_xxx或运算之后的值，所有的OPT_xxx可以在Table 3-3中找到。OPT_xxx的定义在h/netinet/ppp/options.h中。。。。（不知所云）

The following code fragment is>

PPP_OPTIONS pppOpt; /* PPP configuration options */

void routine ()

{

pppOpt.flags = OPT_PASSIVE_MODE | OPT_NO_PAP | OPT_NO_CHAP |

OPT_NO_VJ;

pppOpt.lcp_echo_interval = "30";

pppOpt.lcp_echo_failure = "10";

pppInit (0, "/tyCo/1", "90.0.0.1", "90.0.0.10", 0, &pppOpt, NULL);

}

Setting PPP Options Using an Options File

PPP options are most conveniently set using an options file. There is>

pppFile = "mars:/tmp/ppp_options"; /* PPP config. options file */

void routine ()

{

pppInit (0, "/tyCo/1", "90.0.0.1", "90.0.0.10", 0, NULL, pppFile);

}

In this example, mars:/tmp/ppp_options is a file that contains the following:

在这里例子里，mars:/tmp/ppp_options包含以下内容：

passive   
no_pap   
no_chap   
no_vj   
lcp_echo_interval 30   
lcp_echo_failure 10

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