Asus RX3042H - Manual (Page 45)

RX3042H User's Manual Router Setup
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Figure 5.4. WAN – PPPoE Unnumbered Configuration
connection mode, the range of MTU is from 546 to 1492. The
default value is 1492.
10.Enter appropriate connection settings for “ Disconnect after
Idle (min)” and “Connect on Demand”.
11.Click " Apply" to save the settings.
5.2.3 PPPoE Unnumbered
Some of the ADSL service providers may offer PPPoE unnumbered
service. Choose this connection mode if your ISP provides such
service.