Unstable WAN in Peplink 380

[Rick-DC]

Yes, having two IP addresses with different MAC addresses on the same subnet will definitely make a mess of things! Glad you found it.

As to drop-in mode … I can’t do any better than @mldowling and @Jason did in explaining this …

What is Drop-In Mode?

Drop-in Mode allows the Peplink Balance to be deployed in a network without making any changes to your existing network devices. This feature simplifies the installation by allowing the Balance to transparently and seamlessly work with your routers and firewalls. Let’s take a closer look at the overall picture of the process before installing the Balance. Suppose your existing network looks similar to this diagram. [image] In this example the default gateway router is connected to the ISP. …

Configuring Drop-in Mode

Drop-in Mode is Peplink’s transparent/bridging mode that allows you to seamlessly slot your Peplink into an existing network without having to change configuration on your existing appliances. https://youtu.be/ndG1HCSkZLk When operating, the Peplink forwards traffic between the LAN and the Drop-in Mode WAN without performing any IP address translation/bridging the network. The original firewall/NAT’ing device won’t need any additional configuration/any change in the external IP addresses to wo…

If you’ve followed their guidance let us know what is/is not working and no doubt you’ll receive some further assistance here!

Rick