How can i Fix ping through iptables?

Question

I am making a script with iptables on the firewall machine and when executing it and I want to ping a web page I get an error: ping: www.facebook.com: Temprary failed to name resolution and this happens when I run the script, when I restart everything goes perfectly without any problem, I also tried resolv.conf and it doesn't work.

PS: There are two interfaces enp0s3 that goes to the internet and another one enp0s8 that is from an Internal LAN

I pass you the script

sudo iptables -F

sudo iptables -X

sudo iptables -Z

sudo iptables -t nat -F

sudo iptables -P INPUT DROP

sudo iptables -P OUTPUT DROP

sudo iptables -P FORWARD DROP

sudo iptables -t nat -A PREROUTING -i enp0s3 -p tcp --dport 80 -j DNAT --to-destination 172.16.30.10:80
sudo iptables -t nat -A PREROUTING -i enp0s3 -p tcp --dport 443 -j DNAT --to-destination 172.16.30.10:443
sudo iptables -t nat -A PREROUTING -i enp0s3 -p tcp --dport 22 -j DNAT --to-destination 172.16.30.11:22

sudo iptables -t nat -A POSTROUTING -s 172.16.30.0/24 -o enp0s3 -j MASQUERADE

sudo iptables -A FORWARD -i enp0s3 -o enp0s8 -p tcp --dport 22 -d 172.16.30.11 -j ACCEPT

sudo iptables -A FORWARD -i enp0s8 -o enp0s3 -m state --state ESTABLISHED, RELATED -j ACCEPT

sudo iptables -A FORWARD -o enp0s3 -i enp0s8 -s 172.16.30.0/24 -p icmp -j ACCEPT

sudo iptables -A FORWARD -i enp0s3 -o enp0s8 -s 172.16.30.0/24 -p icmp -j ACCEPT


sudo iptables -A FORWARD -i enp0s8 -o enp0s3 -s 172.16.30.0/24 -p udp --dport 53 -j ACCEPT

sudo iptables -A FORWARD -o enp0s8 -i enp0s3 -d 172.16.30.0/24 -p udp --dport 53 -j ACCEPT

sudo iptables -A FORWARD -i enp0s8 -o enp0s3 -s 172.16.30.0/24 -p tcp --dport 80 -j ACCEPT
sudo iptables -A FORWARD -o enp0s8 -i enp0s3 -s 172.16.30.0/24 -p tcp --dport 80 -j ACCEPT

sudo iptables -A FORWARD -i enp0s8 -o enp0s3 -s 172.16.30.0/24 -p tcp --dport 443 -j ACCEPT
sudo iptables -A FORWARD -o enp0s8 -i enp0s3 -s 172.16.30.0/24 -p tcp --dport 443 -j ACCEPT

sudo iptables -A INPUT -d 172.16.30.1 -p icmp -j DROP

sudo iptables -A OUTPUT -o enp0s3 -p icmp -j ACCEPT

sudo iptables -A INPUT -i enp0s3 -p icmp -j ACCEPT


sudo iptables -A OUTPUT -o enp0s8 -p icmp -j ACCEPT

sudo iptables -A INPUT -i enp0s8 -p icmp -j ACCEPT