I got an RV042 with latest firmware. I use only one WAN port and on the LAN side I use its DHCP with some PC. On the WAN side I have a connection to the ADSL modem (pppoA) which is configured as bridge. The RV gets its WAN IP directly from my ISP, the WAN port is in fact configured in DHCP.
If the power goes off/on or if I reboot the RV (by power unplug/replug) then the WAN port doesn't manage to get its IP. But it gets some automatic private IP from I don't know where (192.168.1.33).
I need to open the settings and do "release" and "renew" in the "system symmary" of the RV web server management. AFter doing manually refreshing the WAN IP then it works ok and keeps the IP (88.112.x.x).
Any idea ?