sh 使用iptables规则进行IP转发以更新DNS而无需停机时间\o /

Posted 2021-05-07

sudo echo 1 >/proc/sys/net/ipv4/ip_forward

PORT=$1
IP=$2

sudo iptables -t nat -A PREROUTING -p tcp --dport $PORT -j DNAT --to-destination $IP
sudo iptables -t nat -A POSTROUTING -p tcp -d $IP --dport $PORT -j MASQUERADE

# Example to find and delete rules using their number and chain name 
# sudo iptables -t nat --line-numbers -L
# sudo iptables -t nat -D PREROUTING 2
# sudo iptables -t nat -D POSTROUTING 2