iptables -S INPUT -P INPUT ACCEPT -A INPUT -i lo -j ACCEPT
路由好像也没问题
# ip route show table local broadcast x.x.55.0 dev eth0 proto kernel scope link src x.x.55.194 local x.x.55.194 dev eth0 proto kernel scope host src x.x.55.194 broadcast x.x.55.255 dev eth0 proto kernel scope link src x.x.55.194 broadcast 127.0.0.0 dev lo proto kernel scope link src 127.0.0.1 local 127.0.0.0/8 dev lo proto kernel scope host src 127.0.0.1 local 127.0.0.1 dev lo proto kernel scope host src 127.0.0.1 broadcast 127.255.255.255 dev lo proto kernel scope link src 127.0.0.1