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Sometimes, not all the time, when I change my router, I have to reboot the modem before the router can detect the WAN connection.
This does not make sense to me. Why does it seem like the modem is discriminating who it's sending data to.
Some sites suggests that it could be a conflict between the LAN IP address of the modem and the router, but that never really happens. The modem and router usually default to different IP ranges (ie. 192.168.100.1 vs 192.168.1.1)
Others suggest that it's because the modem stores the MAC address of the last router, and won't forget it until it is reset.
What's the deal with this? Why are modems designed to be like this? Are there ways around this other than a reset?
1May be, The modem default is to clone a the LAN Client MAC. Try to check that. – user.dz – 2015-05-31T20:49:06.823