WireGuard - Can't ping server or resolve domains - wireguard

Question

I've been trying for the past 5 hours to setup WireGuard on my server, and after getting everything setup, I can't ping IPs or resolve domains.
Below is the server config
[Interface]
Address = 10.100.100.1/24
SaveConfig = true
PostUp = iptables -A FORWARD -i wg0 -j ACCEPT; iptables -t nat -A POSTROUTING -o wg0 -j MASQUERADE; ip6tables -A FORWARD -i wg0 -j ACCEPT; iptables -t nat -A POSTROUTING -o wg0 -j MASQUERADE; ip6tables -A FORWARD -i wg0 -j ACCEPT; ip6tables -t nat -A POSTROUTING -o wg0 -j MASQUERADE
PostDown = iptables -D FORWARD -i wg0 -j ACCEPT; iptables -t nat -D POSTROUTING -o wg0 -j MASQUERADE; ip6tables -D FORWARD -i wg0 -j ACCEPT; iptables -t nat -D POSTROUTING -o wg0 -j MASQUERADE; ip6tables -D FORWARD -i wg0 -j ACCEPT; ip6tables -t nat -D POSTROUTING -o wg0 -j MASQUERADE
ListenPort = 51820
# Server's private key
PrivateKey = EPRQ7Tujdx2pITBV9DeUz+PzYFVb1sax9Fn2hMcLMGI=
[Peer]
# Client's public key
PublicKey = 7FGaduQME4ytI3AyYusl/itkOWU3YgQ3jU7Bsme76WU=
AllowedIPs = 10.100.100.2/32
And this is the client's config
[Interface]
Address = 10.100.100.2/32
# Client's private key
PrivateKey = 0B5b3ysvvpn6kC50sdCFELlMhIexY47kKRRMtBpqdlQ=
[Peer]
# Server's public key
PublicKey = HUuRYaDwqPNHirxlFTewTVKTsCi2udFImqvDfoiAH24=
Endpoint = 129.213.59.233:51820
AllowedIPs = 0.0.0.0/0
PersistentKeepalive = 21
The server has IP-forwading enabled.
I was attempting to follow this video: https://www.youtube.com/watch?v=n00ayGUdCaI

Answer 1

the server side iptables configuration has two problems:
the following 4 configuration repeated two times.
iptables -t nat -A POSTROUTING -o wg0 -j MASQUERADE;
ip6tables -A FORWARD -i wg0 -j ACCEPT;
iptables -t nat -D POSTROUTING -o wg0 -j MASQUERADE;
ip6tables -D FORWARD -i wg0 -j ACCEPT;
For the following 4 lines of configuration should replace wg0 with your main network interface name.
iptables -t nat -A POSTROUTING -o wg0 -j MASQUERADE; -> iptables -t nat -A POSTROUTING -o <your main network interface name> -j MASQUERADE;
ip6tables -t nat -A POSTROUTING -o wg0 -j MASQUERADE -> ip6tables -t nat -A POSTROUTING -o <your main network interface name> -j MASQUERADE
iptables -t nat -D POSTROUTING -o wg0 -j MASQUERADE; -> iptables -t nat -D POSTROUTING -o <your main network interface name> -j MASQUERADE;
ip6tables -t nat -D POSTROUTING -o wg0 -j MASQUERADE -> ip6tables -t nat -D POSTROUTING -o wg0 -j MASQUERADE
for the main network interface name should easy to get with ifconfig or ip -c a command
Eventually, the need to change iptables configuration part should be like:
[Interface]
...
PostUp = iptables -A FORWARD -i wg0 -j ACCEPT; iptables -t nat -A POSTROUTING -o <your main network interface name> -j MASQUERADE;ip6tables -A FORWARD -i wg0 -j ACCEPT; ip6tables -t nat -A POSTROUTING -o <your main network interface name> -j MASQUERADE
PostDown = iptables -D FORWARD -i wg0 -j ACCEPT; iptables -t nat -D POSTROUTING -o <your main network interface name> -j MASQUERADE; ip6tables -D FORWARD -i wg0 -j ACCEPT; ip6tables -t nat -D POSTROUTING -o <your main network interface name> -j MASQUERADE
...