Draytek Vigor 160 Series User Manual page 68

After making changes on the Advance setting page, click the OK button to retain the changes
and return to the LAN IPv6 Setup page. Be sure to click OK on the LAN IPv6 Setup page or else
changes made on the Advance setting page will not be saved.
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behind the router when RA (Router Advertisement) packets
are transmitted.
MTU – It means Max Transmit Unit for packet. If Auto is
selected, the router will determine the MTU value for LAN.
Vigor160 Series User's Guide