手动指定pppoe拨号生成PPP接口ID

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背景

当在一台服务上进行pppoe多次拨号后，会生成相应的ppp0 ppp1等接口名称，当我们对ppp0所在的接口重新拨号后，重新生成的接口不一定是ppp0，由于自动重启脚本是针对接口进行重启，所以我们需要固定好ppp接口，即使重启接口id也不会发生变化！

修改系统拨号脚本

脚本启动做如下约定

sudo /usr/sbin/adsl-start /etc/sysconfig/network-scripts/ifcfg-ppp0

在进行拨号传递$@参数时，$@的值为/etc/sysconfig/network-scripts/ifcfg-ppp0

修改/sbin/pppoe-connect拨号脚本

vim /sbin/pppoe-connect 
 
#Manual Set PPP Interface ID
#--------------------------------------------------------------------
echo -e "\033[32;1m$@\033[0m"
if [ "$@" = "/etc/sysconfig/network-scripts/ifcfg-ppp0" ];then
    UNIT="unit 0"
elif [ "$@" = "/etc/sysconfig/network-scripts/ifcfg-ppp1" ];then
    UNIT="unit 1"
elif [ "$@" = "/etc/sysconfig/network-scripts/ifcfg-ppp2" ];then
    UNIT="unit 2"
elif [ "$@" = "/etc/sysconfig/network-scripts/ifcfg-ppp3" ];then
    UNIT="unit 3"
elif [ "$@" = "/etc/sysconfig/network-scripts/ifcfg-ppp4" ];then
    UNIT="unit 4"
elif [ "$@" = "/etc/sysconfig/network-scripts/ifcfg-ppp5" ];then
    UNIT="unit 5"
elif [ "$@" = "/etc/sysconfig/network-scripts/ifcfg-ppp6" ];then
    UNIT="unit 6"
fi
#--------------------------------------------------------------------

将$UNIT追加至PPP_STD_OPTIONS参数

PPP_STD_OPTIONS="$IPPARAM $LINKNAME $PLUGIN_OPTS noipdefault noauth default-asyncmap $DEFAULTROUTE hide-password nodetach $PEERDNS mtu $MTU mru $MRU noaccomp nodeflate nopcomp novj novjccomp user $USER lcp-echo-interval $LCP_INTERVAL lcp-echo-failure $LCP_FAILURE $PPPD_EXTRA $UNIT"

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