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IP automatic for WAN port doesn´t works

Hi, I have a RV042 with latest firmware ( and I´m trying to conect to Internet in port WAN1 with the optino "Obtain an IP automatically". I have noticed that the router receives an IP from the modem, I´m able to connect to the from a PC in the same WAN subnet to the WEB Management page, but in the system summary the Wan Status is IP address  default gateway DNS and the pc in the internal LAN couldn't surf Internet.

The only way is assigning an static IP an DNS servers, and then all works fine.

On the system log shows the message "infinite IP address lease time. Exiting" when activate the IP automatically for the WAN1 connection type.

There is no option to change the leased time.

I need to send a router to a remote office where the connection to INternet is with a dynamic IP. Help please

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