Asus SL1200 Bedienungsanleitung PDF herunterladen (Seite 56)

Chapter 5 - Conguring LAN Settings

ASUS SL1200

5.3.3 Conguring DNS Relay

When you specify the device’s LAN port IP address as the DNS address,

then the router automatically performs “DNS relay”. Since the device

itself is not a DNS server, it forwards domain name lookup requests from

the LAN PCs to a DNS server at the ISP. It then relays the DNS server’s

response to the PC.

When performing DNS relay, the router must maintain the IP addresses of

the DNS servers it contacts. It can learn these addresses in either or both

of the following ways:

• Learned through PPPoE or Dynamic IP Connection: If the Internet

Security Router uses a PPPoE (see section 6.2.2 Conguring

PPPoE for WAN) or Dynamic IP (see section 6.3.2 Conguring

Dynamic IP for WAN) connection to the ISP, the primary and

secondary DNS addresses can be learned via the PPPoE protocol.

Using this option provides the advantage that you will not need

to recongure the PCs or the router if the ISP changes their DNS

addresses.

• Congured on the router: You can also specify the ISP’s DNS

addresses in the WAN Conguration page as shown in Figure 6.1.

WAN PPPoE Conguration Page, Figure 6.2. WAN Dynamic IP

(DHCP client) Conguration Page, or Figure 6.3. WAN Static IP

Conguration Page.

To congure DNS relay

1. Enter LAN IP in the DNS Server IP Address eld in DHCP conguration

page as shown in Figure 5.2.

2. Congure the LAN PCs to use the IP addresses assigned by the DHCP

server on the router, or enter the router’s LAN IP address as their DNS

server address manually for each PC on your LAN.

DNS addresses that are assigned to LAN PCs prior to

enabling DNS relay will remain in effect until the PC is

rebooted. DNS relay will only take effect when a PC’s DNS

address is the LAN IP address. Similarly, if after enabling

DNS relay, you specify a DNS address (other than the LAN

IP address) in a DHCP pool or statically on a PC, then that

address will be used instead of the DNS relay address.

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Asus SL1200 Bedienungsanleitung Seite 56