For who has a Firewalld based Linux distribution like Fedora/RHEL/CentOS:
=== Host B (VPN gateway) ===
When system creates interface wg0, it is not attached to any firewall
zone, so it falls into default zone, that blocks everything except for
ICMP packets. Therefore if you simply run ping among
Thank you very much Jason, your help has been precious!!
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If you want A and C to communicate through B as a trusted intermediary
for A and C's IPs, then your configs actually need to be:
=== Host A (Fedora 26) ===
# cat /etc/wireguard/wg0.conf
[Interface]
Address = 10.1.0.21/24
PrivateKey = *censored*
[Peer]
PublicKey = *censored*
Endpoint =