Draytek 2750 manual Lan, Basics of LAN

SIM PIN code	Type PIN code of the SIM card that will be used to access
	Internet.
Modem Initial String1/2	Such value is used to initialize USB modem. Please use the
	default value. If you have any question, please contact your ISP.
APN Name	APN means Access Point Name which is provided and
	required by some ISPs.
Modem Dial String	Such value is used to dial through USB mode. Please use the
	default value. If you have any question, please contact to your
	ISP.
PPP Username	Type the PPP username (optional).
PPP Password	Type the PPP password (optional).

3.3 LAN

Local Area Network (LAN) is a group of subnets regulated and ruled by router. The design of network structure is related to what type of public IP addresses coming from your ISP.

Basics of LAN

The most generic function of Vigor router is NAT. It creates a private subnet of your own. As mentioned previously, the router will talk to other public hosts on the Internet by using public IP address and talking to local hosts by using its private IP address. What NAT does is to translate the packets from public IP address to private IP address to forward the right packets to the right host and vice versa. Besides, Vigor router has a built-in DHCP server that assigns private IP address to each local host. See the following diagram for a briefly understanding.

44 Vigor2750 Series User’s Guide