Buffalo TeraStation Setup Manual page 20

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Do not set the same network address for LAN port1 and LAN port 2, or data transmission may be unstable. If this happens,
initialize the TeraStation with the Reset Button.
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If you want to access a different network from the TeraStation, use LAN port 1. LAN port 2 cannot access beyond the local subnet
as it doesn't have a default gateway.
Examples: You cannot use the Mail Notification (cannot find the mail server). You cannot find a TeraStation/LinkStation which
specified as a backup destination by IP address.
To resolve, place the TeraStation on the same subnet as the device that you are trying to connect to via LAN port 2.
TeraStation Setup Manual 19