This Article Applies to:

ER605(UN)_V1_1.1.1_Build 20210723 or above firmware

ER7206(UN)_V1_1.1.1_Build 20210723 or above firmware

Background:

We noticed that a few ISPs may provide WAN IP Addresses with 31-bit or 32-bit subnet masks for Internet access.

However, our Business Routers doesn’t accept such WAN IP addresses, so the router will reject the offered WAN IP address from ISP, resulting in a WAN configuration failure.

Related feedback post:

ER605 declines DHCP offers from LTE Modem

The System Log of the ER605 shows the following error messages:

[osg:xx-xx-xx-xx-xx-xx] failed to obtain the IP address for WAN because IP-Address/Gateway can't be a broadcast address or a network address (IP-Address=xxx.xxx.xxx.xxx, Mask=255.255.255.255, Gateway=xxx.xxx.xxx.x).

Available Solutions:

To resolve the issue quickly, here we have made a Beta firmware for you,

ER605(UN)_v1_1.1.1_Build 20210926 (Beta)

ER7206(UN)_v1_1.1.1_Build 20210926 (Beta)

Release note:

Support the WAN IP addresses with 31-bit or 32-bit subnet masks.

 [Case Closed]  Update: 

The issue has been fixed in the official 1.2.0 firmware, please check for an update from Here.

Thank you for your attention!

Feedback:

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Thank you for your great cooperation and patience!

TP-Link Support Team