Digi APPLICATION NOTE 34 User Manual

1 Application Note 34 Configuring ADSL to backup to PSTN/ISDN with automatic testing and recovery back to ADSL. UK Support 29 December 2009

10 inspect-state – monitor the pings for echo replies and allow them back in oos 10 t=3 c=3 d=3 – if 3 consecutive pings fail, deactivate PPP 1 and

11 3 TESTING 3.1 Simulate a failure To test the fail over and recovery you will need to configure the PPP interface to ping a IP address that you

12 ppp 4 username "[email protected]" ppp 4 epassword "encrypted" ppp 4 phonenum " 0845 1400101" ppp 4 use_modem 3 ppp 4 aod

13 PollANS Revision: 1.2 PPPOE Revision: 1.0 BRIDGE Revision: 1.1 MODEM CC (Option 3G)

2 Contents 1 Introduction ...

3 Configuration: This Application Note assumes that the Digi Transport router is already configured with a working ADSL connection through PPP 1. 1.3

4 2 CONFIGURATION 2.1 Configure PPP 1 (ADSL) This PPP interface should already be configured for use with the ISP. You should confirm that you hav

5 Click OK

6 2.2 Configure PPP 4 (PSTN) It will be necessary to configure PPP 4 as an outbound interface as the default is for the interface to accept incomin

7 Click OK Configuration - Interfaces > PPP > PPP 0 - 4 > PPP 4 > Advanced The PSTN interface needs to be configured so that if PPP

8 Click OK 2.3 Configure the Default Routes It is necessary to configure two default routes, one for PPP 1 and one for PPP 4. The PPP 1 default

9 Click OK 2.4 Configure the Firewall The firewall should be configured to monitor the ICMP requests generated by PPP 1. If the firewall detec