AGL Eero 6, Technical Manual

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3. Swap units (if possible).
If the above steps don’t resolve this issue, consider the following:
Make sure that the WAN connection cable isn’t frayed, poorly terminated, or has
questionable integrity, and that the eero is properly connected to the modem (one
Ethernet cable to a designated LAN port). If the cable checks out, connect a client device
like a laptop or desktop to the modem, power cycle the modem, and see if the internet is
reachable.