CeroWrt and BCP38

CeroWrt 3.10.32-12 and later incorporate a module that implements the Best Common Practices 38 (BCP38) internet specification. This specification is discussed in detail at: http://www.bcp38.info/index.php/Main_Page

BCP38 prevents devices on the LAN side of the CeroWrt from spoofing source addresses. By default, CeroWrt filters out spoofed addresses on packets before they are sent into the Internet.

The implementation goes to some lengths to detect the multiple-router case, so that you can have a primary and secondary router in your home. The image below shows the GUI in the CeroWrt web interface. Find it from the Network > Firewall > BCP38 tab.

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