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VPS / VPN manual

To put SSH key to PUTTY – Connection -> SSH -> Auth
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To install OpenVPN to the server:
wget https://git.io/vpn -O openvpn-install.sh && bash openvpn-install.sh
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To transfer a file from the server to local machine:
scp -i C:\VPS\ssh-key.key user@xxx.xxx.xxx.xxx:/home/user/client.ovpn D:\DestinationDirectory\
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On the VPS:
Enabling FireWall
ufw status verbose
ufw disable
ufw enable
ufw reload
/etc/ufw/ufw.conf
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On the instance:
Virtual Cloud Networks -> Create VCN
IPv4 CIDR Block: 10.0.0.0/16
Subnets -> Create subnet
IPv4 CIDR Block: 10.0.0.0/24
Route Table -> Add Route Rules
Target Type = Internet Gateway
Destination CIDR Block = 0.0.0.0/0
Target Internet Gateway = Internet Gateway vcn-***
Security Lists -> Add Security List
Ingress Rules:

1. Source Type = CIDR
   Source = 0.0.0.0/0
   IP Protocol = TCP
   Source Port Range = All
   Destination Port Range = 22
   Allows = TCP traffic for ports: 22 SSH Remote Login Protocol
2. Source Type = CIDR
   Source = 0.0.0.0/0
   IP Protocol = ICMP
   Type = 8
   Allows = ICMP traffic for: 8 Echo
3. Source Type = CIDR
   Source = 10.0.0.0/16
   IP Protocol = ICMP
   Type = 8
   Allows = ICMP traffic for: 8 Echo
4. Source Type = CIDR
   Source = 10.0.1.0/24
   IP Protocol = All Protocols
   Allows = All traffic for all ports

On the instance:
Network security groups -> Edit
Security Rules
Direction = Ingress
Source Type = CIDR
Source CIDR = 0.0.0.0/0
IP Protocol = All Protocols
Source Port Range, Destination Port Range = All
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In the client *.ovpn:
dhcp-option DNS 8.8.8.8