今天发现北京到杭州的一条ip隧道不通了，不知道为啥，发出来的包好像被本机吞掉了，没有继续发下去的样子，检查了半天，最后发现是sysctl里面被人改了。forwarding本来默认是1的，现在默认是0了，真tmd郁闷，重新开了，把ip隧道重启一下就好了。。。
net.ipv4.conf.default.forwarding=1
net.ipv4.conf.all.forwarding=1
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