/sbin/ifconfig rl0 192.168.2.1/24 alias 类似cisco,secondary地址
/sbin/sysctl net.link.ether.ipfw=1 打开控制二层包
ipfw add 303 deny ip from any to any MAC any xxxxxxxx deny目标mac
/var 经常满的解决方式,
find /var/spool/clientmqueue/ -type f -delete
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