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Telstra’s cited support article documents10.0.0.138 or telstra.gateway for Smart Modem access. Use the exact model and current address. The credential example here is scoped to Smart Modem1.1 and Gen2, not every Telstra modem.
Use this local link only when it matches your own equipment and network. RouterEntry does not detect your gateway or collect passwords.
Connect locally and match the modem generation
Join the modem’s Wi-Fi network or connect a computer by LAN Ethernet. The source gives http://telstra.gateway as another local route. It distinguishes a Telstra Business Smart Modem address of192.168.15.1, so the Telstra name alone does not identify the correct IP.
Use the current administrator password
For the cited Smart Modem1.1/Gen2 guidance, the unchanged username is admin and password telstra. Use the current password if changed. Later generations have different credential guidance; do not apply this pair universally. See the separately scoped Smart Modem Gen3 guide if that matches your label.
Inspect Wi-Fi information before making changes
The article directs Smart Modem users to the Wi-Fi menu. You can identify the current network information before deciding whether to change anything. Applying changes can disconnect clients, so do not change channels just to test administrator access.
If the local page does not open, read the actual gateway, check the modem generation and compare wired versus wireless access. Use local login diagnostics or service-outage checks as appropriate; reaching the modem does not prove nbn service is working.
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Telstra: modem access and generation-specific credentials