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mgax/firewall-proxy.sh

Created November 2, 2018 11:26
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Forward web traffic to backend server
Raw
firewall-proxy.sh
#!/bin/bash -e
PROXY=$(curl -s ipinfo.io/ip)
BACKEND="(dig +short example.com)
set -x
iptables -t nat -F
iptables -t nat -A PREROUTING -p tcp --dport 80 -d $PROXY -j DNAT --to $BACKEND:80
iptables -t nat -A PREROUTING -p tcp --dport 443 -d $PROXY -j DNAT --to $BACKEND:443
iptables -t nat -A POSTROUTING -d $BACKEND -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
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