Wg assign peer public IP

# Server side

$ sysctl -w net.ipv4.conf.eth0.proxy_arp=1 && sysctl -w net.ipv4.ip_forward=1 && ip addr del SECOND_IP/NETMASK dev eth0

$ cat /etc/wireguard/server.conf

[Interface]
Address = 10.0.0.1/32
PrivateKey = SERVER_PRIVATEKEY
ListenPort = 51820

[Peer]
PublicKey = PEER0_PUBLICKEY
PresharedKey = PEER0_PSK
AllowedIPs = SECOND_IP/32


# "Client" side

$ cat /etc/wireguard/peer0.conf

[Interface]
Address = SECOND_IP/32
PrivateKey = PEER0_PRIVATEKEY
DNS = 1.1.1.1

[Peer]
PublicKey = SERVER_PUBLICKEY
PresharedKey = PEER0_PSK
AllowedIPs = 0.0.0.0/0
Endpoint = MAIN_IP:51820
PersistentKeepalive = 25