How to use Sputnik-powered devices with half-bridged modems
Some ISPs deploy half-bridged modems which can cause intermittent connectivity issues with Sputnik-powered devices. Here's how to fix it.
Disable the SPI firewall.
Normally the router's SPI firewall is enabled as a security precaution. However it must be disabled if the Sputnik-powered device is connected to a half-bridged modem.
Browse to MANAGE > Routers > your router > Execute Command: Command Line and enter:
nvram set filter=off
nvram commit
startstop lan
Confirm the new settings.
From Execute Command, enter:
nvram get filter
The result should be:
off
IMPORTANT: If you have multiple routers at a single location, power off all routers after you have disabled SPI firewall, and turn them back on again. If even a single router is left powered on with SPI enabled, it will disrupt the connection for the other routers onsite in a way that is not fixable by rebooting those other routers individually.