linux sysctl -p 報error: "net.bridge.bridge-nf-call-ip6tables" is an unknown key

修改 linux 核心檔案 sysctl  -P 報錯
error: "net.bridge.bridge-nf-call-ip6tables" is an unknown key
error: "net.bridge.bridge-nf-call-iptables" is an unknown key
error: "net.bridge.bridge-nf-call-arptables" is an unknown key

處理 ：  
# modprobe  bridge 
# lsmod | grep bridge

#sysctl  -p    不再報錯。