Archer D7b AC1750 Wireless Dual Band Gigabit ADSL2+ Modem Router (Annex B) User Guide
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4.5.1.2 Dynamic IP
Select this option, the modem router will be able to obtain IP network information dynamically from
a DHCP server provided by your ISP.
Figure 4-6
Click Advance, advanced selections for WAN Service Setup can be shown.
MTU (bytes): Maximum Transmission Unit Size. Check this box then you can change the MTU
size. The default MTU value is 1500 Bytes. It is not recommended that you change the default
value unless required by your ISP.