Westell Inc. A9081XXYY-07 ユーザーズマニュアル

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030-300479 Rev. A 
Draft 1 – 10/17/05 
 
 
030-300479 Rev. A 
50 
October 2005 
 User Guide 
UltraLine IIB (Model A90-816030)
by the network and which portion is controlled by the host. 
Address Range 
DHCP Start Address 
Displays the first IP address that the Public LAN DHCP Server will provide. 
The DHCP Start Address must be within the IP address and lower than the 
DHCP End Address. 
DHCP End Address 
Displays the last IP address that the Public LAN DHCP Server will provide. 
The DHCP End Address must be within the IP address and higher than the 
DHCP Start Address. 
DHCP Lease Time 
Factory Default = 01:00:00:00  
Displays the amount of time the provided addresses will be valid, after which 
time the Public LAN DHCP client will usually re-submit a request. 
Note: DHCP Lease Time is displayed in the format (day:hour:min:sec)*. This 
value must be greater than 10 seconds. Seconds must be between 0 and 59, 
minutes must be between 0 and 59, and hours must be between 0 and 23. 
 
 
If the settings you have entered in the Public LAN Settings fields are incorrect, the following warnings messages 
may be displayed via pop-up screens. If this occurs, check the Public LAN settings. 
 
Warning Message 
Check Public LAN DHCP Settings 
Start Address is not part of the Subnet 
Check the value in the DHCP Start Address field 
End Address is not part of the Subnet 
Check the value in the DHCP End Address field 
End Address is below the Start Address 
Check the value in the DHCP End Address field 
Lease time must be greater than 10 seconds 
Check the values in the DHCP Lease Time fields 
Seconds must be between 0 and 59 
Check the Seconds field at DHCP Lease Time 
Minutes must be between 0 and 59 
Check the Minutes field at DHCP Lease Time 
Hours must be between 0 and 23 
Check the Hours field at DHCP Lease Time 
 
 
15.5.4  IP Passthrough – Single IP Address Passthrough 
 
The following screen will be displayed if you select LAN > IP Passthrough from the Configuration menu. IP 
Passthrough enables you to select the device on your LAN that will share your Single Static IP address. Before you 
begin this section, configure your PC settings to obtain an IP address from your Gateway automatically. (Refer to 
your computer’s Windows® Help screen for instructions.) 
 
NOTE: IP Passthrough enables you to share the WAN-assigned IP address with one device on your LAN. Network 
Address Translation (NAT) and Firewall rules do not apply to the device configured for IP Passthrough. Thus, the 
device with the single static IP address becomes visible on the Internet. If you are using Routed IP protocol, IP 
Passthrough configuration will not be available.