How to solve the problem that pptp cannot access the intranet under Linux

The solution to the problem that pptp cannot access the intranet under Linux is: 1. Make sure that the intranet routing has been correctly configured when establishing the PPTP connection. After manually adding routing rules, try to access the intranet resources to see if the connection can be successful. ; 2. Check the firewall configuration on the Linux host to ensure that PPTP traffic is allowed to pass; 3. Check whether the DNS settings are correct, edit, save and exit the edited file, and then try to access the intranet resources again.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

If you cannot access the intranet using PPTP (Point-to-Point Tunneling Protocol) connection on Linux, it may be caused by routing settings or firewall configuration issues. The following are some solutions:

1. Routing settings:

Make sure you have correctly configured the intranet routing when establishing a PPTP connection. PPTP connections typically create a virtual network interface (such as ppp0), but do not route traffic to the internal network by default. You can use the following command to manually add routing rules:

  sudo route add -net [内网网段] dev ppp0

where [intranet segment] is the IP segment of your intranet, and ppp0 is your PPTP interface name. For example, if your intranet segment is 192.168.0.0/24, the command will be similar to:

  sudo route add -net 192.168.0.0/24 dev ppp0

After adding the routing rules, try to access the intranet resources to see if the connection can be successful.

2. Firewall settings:

Check the firewall configuration on your Linux host to ensure that PPTP traffic is allowed to pass. The specific firewall configuration depends on the firewall software you use, common ones are iptables or ufw. Here are some example commands:

If using iptables, make sure to allow traffic through that virtual interface (such as ppp0):

sudo iptables -A INPUT -i ppp0 -j ACCEPT 
sudo iptables -A OUTPUT -o ppp0 -j ACCEPT

If using ufw, make sure to allow traffic through that virtual interface (such as ppp0) Traffic:

sudo ufw allow in on ppp0 
sudo ufw allow out on ppp0

After adding the firewall rules, try to access the intranet resources again.

3. DNS settings:

Check whether your DNS settings are correct. If you are unable to resolve the intranet hostname, make sure you have the correct DNS server configured in your /etc/resolv.conf file. The file can be edited using the following command:

  sudo vi /etc/resolv.conf

In the opened file, add or modify the following line to specify the correct DNS server address:

  nameserver [DNS服务器IP]

Replace [DNS Server IP] with your DNS The IP address of the server. After saving and exiting the file, try accessing intranet resources again.

If the problem still exists, it is recommended to provide more specific error information, network topology diagram and related configuration file contents to further help investigate and solve the problem.

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