iptables allow traffic to docker network
Container communicates with host using docker0 interface. To allow traffic from container add:
iptables -t nat -nL
iptables -A INPUT -i docker0 -j ACCEPT
iptables -A FORWARD -o docker0 -j DOCKER
iptables -A FORWARD -o docker0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i docker0 ! -o docker0 -j ACCEPT
iptables -A FORWARD -i docker0 -o docker0 -j ACCEPT
iptables -t nat -nL
sysctl --write net.ipv4.ip_forward=1
cat /proc/sys/net/ipv4/ip_forward # -> 1
iptables -A INPUT -j LOG