Softether VPN Server Disturbs Network

Softether is great. Setting up a VPN server with multi protocol support is made pretty easy with it.

Well I’m not going to talk about how to setup softether and so on, Today I’m going to share an issue that I was experiencing by setting up softether on my Virtual Machines.

Softether uses a built in DHCP server to assign internal IP addresses to your VPN users. That is great, but sometime you may see your whole network crashing.

I set up softether on our data center and it was working pretty well. After Few hours I realized that there is a large amount of broadcast packets within the network coming out from the Softether machine.

Looking up the problem for few days I realized that the local bridge was causing the issue. The local bridge feature will try to put the vpn server in state of the host machine in your physical network, which means the VPN server will start sending DHCP broadcast packets to all the physical machines in your network. This can cause confusion for your other machines and network disturbance.

So, how to fix this?

  1. Connect to your VPN server with Softether VPN Server Manager
  2. Click on “Local Bridge Setting” button.
  3. You should see a bridge with your physical network card and your virtual hub in the bridge list. Select it and click on Delete Local Bridge Button.

Thats it.

The DHCP server will not send DHCP broadcasts within your physical network anymore. while it still assigns internal IP addresses to the clients which are trying to connect to the VPN server.

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