I don't think you understand the meaning of the word

[jmjones]

good old UDP port 4500. It has something to do with SIP. Peplink puts that on whatever is on WAN1. Here is a thread that discusses it and how to move it to the other WAN

M-cell config - UDP 4500

I have an AT&T M-Cell. It seems to want to use port 4500 UDP, but I see that other devices besides that M-Cell are able to use that port at the same time. I have an enforced outbound policy by Source IP for port 4500 UDP for WAN2, yet I have seen this device with its connection on WAN1. I have now set the enforced policy to just Source IP, and I continue to find this M-Cell device with an Active session from it to the internet on WAN1. How is that happening? Whatever is going on is possibly ca…