Configuration issue raspberry Pi 3B

Installing and Using OpenWrt Network and Wireless Configuration
22

So you have this scenario:

  +------------+
  |            |
  |  Device    |
  +------------+
           +                +------+
           | USB            |      |
  +--------v---+            | PC   |
  |            |            |      |
  | Raspberry  |            +------+
  +------------+               +
            +                  |
            |Ethernet          |Wifi
            |                  |
            |                  +
            |   +-------------------+
            |   |                   |
            +-->|   Router          |
                +-------------------+
                       +
                       v
                    Internet

Does the device need to get IP settings from the Router or can it take them from Raspberry?

  1. If it takes settings from Router, then you need to bridge eth0 and eth1 as one interface. But iptables will not work well on a bridged interface. Take a look here.
  2. If it acquires settings from Raspberry keep the 2 interfaces but you need to remove the bridge and assign one in LAN firewall zone (to the device) and the the other to WAN firewall zone (to the Router). Don't forget to enable NAT, the default Openwrt configuration works fine in this setup.
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