Step 1:Install PPTP Server

VPN试用 2026-07-01 20:41:25 7 0

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Setting up a PPTP VPN on a Linode server is possible, but note that PPTP is outdated and insecure (prone to attacks). Modern alternatives like OpenVPN, WireGuard, or IPsec are recommended. However, if you still need PPTP, here's how to configure it on Ubuntu/Debian:

Update your system:
```
sudo apt update && sudo apt upgrade -y
```
Install PPTPD:
```
sudo apt install pptpd -y
```

Step 2: Configure PPTP VPN

Edit the PPTP config file:
```
sudo nano /etc/pptpd.conf
```
Add these lines (replace 168.100.1-100 with your preferred IP range):
```
localip 192.168.100.1
remoteip 192.168.100.2-100
```

Set DNS servers (edit /etc/ppp/pptpd-options):

sudo nano /etc/ppp/pptpd-options

Add:

ms-dns 8.8.8.8
ms-dns 8.8.4.4

Add VPN credentials (edit /etc/ppp/chap-secrets):

sudo nano /etc/ppp/chap-secrets

Format:

username pptpd password *

Step 3: Enable IP Forwarding

Edit /etc/sysctl.conf:

sudo nano /etc/sysctl.conf

Uncomment or add:

net.ipv4.ip_forward=1

Apply changes:

sudo sysctl -p

Step 4: Configure NAT (Firewall Rules)

Allow PPTP port (1723) and GRE protocol:

sudo iptables -A INPUT -p tcp --dport 1723 -j ACCEPT
sudo iptables -A INPUT -p gre -j ACCEPT

Set up NAT for VPN traffic:

sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

Save rules (if using iptables-persistent):

sudo apt install iptables-persistent -y
sudo netfilter-persistent save

Step 5: Start and Enable PPTPD

sudo systemctl restart pptpd
sudo systemctl enable pptpd

Step 6: Connect to PPTP VPN

Windows:
Go to Settings > Network & Internet > VPN > Add VPN.
Enter your Linode server IP, username, and password.
Android/iOS:
Add a new PPTP VPN in network settings.

⚠️ Important Security Notes:

PPTP uses weak encryption (easily cracked).
If security is a concern, use OpenVPN or WireGuard instead.
Consider enabling a firewall (UFW) to restrict access:
```
sudo ufw allow 1723/tcp
sudo ufw enable
```