I installed Openwrt on the MR6400 today. I have another router with which I connect to the internet.
I connected a lan port from that to the LAN/WAN port of the MR6400 and then my laptop through a LAN cable to a LAN port on the MR6400.
I have the default configuration and LAN is configured as bridge-lan and WAN as DHCP-client.
I don't have any internet connectivity on Openwrt. Pinging openwrt.org and google.com both fail.
When I check the WAN port it doesn't have an IP address even though its set as DHCP-client. Restarting the interface doesn't change anything.
So I tried to reboot Openwrt.
If I reboot Openwrt with the internet router on the WAN port, the laptop gets its IP from the internet router instead of Openwrt.
If I enable WIFI on Openwrt and connect through that the laptop gets IP from the internet router.
In both instances above, I am unable to access Openwrt. The only way I can access Openwrt is if there is no connection on its WAN port.
How do I set up Openwrt to use the internet connection from existing router and act as a router itself for devices connected to Openwrt?