Vigor2930 Series User’s Guide
198
IP Address Assignment 
Method (IPCP) 
In most environments, you should not change these settings 
as most ISPs provide a dynamic IP address for the router 
when it connects to the ISP. If your ISP provides a fixed IP 
address, check 
Yes 
and enter the IP address in the field of 
Fixed IP Address
. 
Select
Dialing to Dual ISPs 
if you have more than one ISP. You will be able to dial to both 
ISPs at the same time. This is mainly for those ISPs that do not support Multiple-Link PPP 
(ML-PPP). In such cases, dialing to two ISPs can increase the bandwidth utilization of the 
ISDN channels to 128kbps data speed.
Common Settings 
Enable Dual ISPs Function - 
Check to enable the Dual ISPs 
function. 
Require ISP Callback (CBCP) -
If your ISP 
supports the callback function, check this box to activate the 
Callback Control Protocol during the PPP negotiation. 
PPP/MP Setup
Link Type 
– 
There are three link types provided here for 
different purpose. 
Link Disable 
disables the ISDN dial-out 
function. 
Dialup 128Kbps 
allows you to use both ISDN B 
channels for Internet access. 
Dialup BOD 
(for detailed 
information of configuration, please refer to section 
3.12.4
) 
stands for bandwidth-on-demand. The router will use only one 
B channel in low traffic situations. Once the single B channel 
bandwidth is fully used, the other B channel will be activated 
automatically through the dialup. 
PPP Authentication - 
PAP only allows you to configure the 
PPP session to use the PAP protocol to negotiate the username 
and password with the ISP. 
PAP or CHAP 
can configure the 
PPP session to use the PAP or CHAP protocols to negotiate 
the username and password with the ISP. 
Idle Timeout - 
Idle timeout means the router will be 
disconnect after being idle for a preset amount of time. The 
default is 180 seconds. If you set the time to 0, the ISDN 
connection to the ISP will always remain on.