Draytek 2950 User Guide

 

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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. 

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. 

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 3.10.5) 
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.