PPP官网下载：https://download.samba.org/pub/ppp/
编译：
root@zhaoxc-VBox:/opt/arm-tools/ppp-2.4.5# ./configure –prefix=/opt/arm-tools/ppp-2.4.5/install-arm/
root@zhaoxc-VBox:/opt/arm-tools/ppp-2.4.5# make CC=arm-none-linux-gnueabi
root@zhaoxc-VBox:/opt/arm-tools/ppp-2.4.5# make install
注1：由于一开始的编译命令式./configure –host=arm-none-linux-gnueabi –prefix=/opt/arm-tools/ppp-2.4.5/install-arm/ 实际上生成的Makefile里面并没有指定编译器，但是make时使用的是gcc，而不是arm-none-linux-gnueabi-gcc，所以在ARM无法运行。报错“pppd -sh: cannot execute binary file ”
注2：make时出错“ppp install “error: field ‘pppol2tp’ has incomplete type”然后搜索原因，在网上找到一位大神的修复方法：在ppp-2.4.5/include/linux/if_pppol2tp.h中添加程序如下：
— ppp-2.4.5/include/linux/if_pppol2tp.h 2009-11-16 22:26:07.000000000 +0000
+++ ppp-2.4.5/include/linux/if_pppol2tp.h 2010-07-16 22:35:22.000000000 +0100
@@ -32,6 +32,45 @@
__u16 d_tunnel, d_session;
};
+
+struct pppol2tpin6_addr {
+ __kernel_pid_t pid;
+ int fd;
+
+ __u16 s_tunnel, s_session;
+ __u16 d_tunnel, d_session;
+
+ struct sockaddr_in6 addr;
+};
+
+
+struct pppol2tpv3_addr {
+ pid_t pid;
+ int fd;
+
+ struct sockaddr_in addr;
+
+ __u32 s_tunnel, s_session;
+ __u32 d_tunnel, d_session;
+};
+
+struct pppol2tpv3in6_addr {
+ __kernel_pid_t pid;
+ int fd;
+
+ __u32 s_tunnel, s_session;
+ __u32 d_tunnel, d_session;
+
+ struct sockaddr_in6 addr;
+};
+
/* Socket options:
* DEBUG – bitmask of debug message categories
* SENDSEQ – 0 => don’t send packets with sequence numbers
复制到ARM上：
按照上面的make好之后，由于make install出错，所以直接在目录中找到如下的四个文件：
chat pppd pppdump pppstats
复制到ARM的/usr/sbin目录下
建立/etc/ppp目录：
从ppp-2.4.5相应目录中拷贝文件，建立如下目录结构：
/etc/ppp/chap-secrets
/etc/ppp/pap-secrets
/etc/ppp/ip-up
/etc/ppp/ip-down
/etc/ppp/peer/
拨号上网：
见 http://www.68idc.cn/Linux/2016-03/129581.htm
参考网页：https://forums.gentoo.org/viewtopic-p-7100056.html
https://bugs.gentoo.org/attachment.cgi?id=320466&action=edit
但我自信，我能点亮心烛，化解心灵的困惑。
