然后把结果贴给tk,如果ppp有问题,一般会是
[root@root ~]# /usr/sbin/pppd
/usr/sbin/pppd: This system lacks kernel support for PPP. This
the PPP kernel module could not be loaded, or because PPP was no
included in the kernel configuration. If PPP was included as a
module, try `/sbin/modprobe -v ppp'. If that fails, check that
ppp.o exists in /lib/modules/`uname -r`/net.
See README.linux file in the ppp distribution for more details.