Digi 34 Application Note
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Digi 34, 2 Contents 1 Introduction ............................................................................................................................................... 2 1.1 Outline ............................................................................................................................................... 2 1.2 Assumptions ...................................................................................................................................... 2 1.3 Corrections
Digi 34, 3 Configuration: This Application Note assumes that the Digi Transport router is already configured with a working ADSL connection through PPP 1. 1.3 Corrections Requests for corrections or amendments to this application note are welcome and should be addressed to: [email protected] Requests for new application notes can be sent to the same address. 1.4 Version Version Number Status 1.0 Published 1.1 Re-branded to Digi Transport
Digi 34, 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 have a working ADSL connection before proceeding with this configuration. The PPP 1 interface needs to be configured to be “always on”. The inactivity timer should be set to 0. Configuration - Interfaces > PPP > PPP 0 - 4 > PPP 1 > Standard Parameter Setting Description Always on mode ON Configures interface as always on Inactivity timeout (s): 0 Interface is always connected and active
Digi 34, 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 incoming calls. Then ISP configuration will be added. Navigate to the following location: Configuration - Interfaces > PPP > PPP 0 - 4 > PPP 4 > Standard Scroll to the bottom of the page and click “Load dialling defaults”. The PPP 4 configuration needs to be configured to be “always on” and have a power up delay of 60 seconds to allow the AD
7 Click OK Configuration - Interfaces > PPP > PPP 0 - 4 > PPP 4 > Advanced The PSTN interface needs to be configured so that if PPP 1 (ADSL) is up and in service (i.e. passing data) then this interface is not allowed to initiate a connection. Parameter Setting Description Inhibit auto-activation when these PPPs are active 1 Inhibit auto-a
Digi 34, 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 route needs to be set so PPP 4 is deactivated when PPP 1 returns to service after a successful recovery. Configuration - Routing > Default Route 0 Parameter Setting Description Interface PPP Default route 0 is via PPP 1 Interface # 1 Deactivate interface PPP PPP 4 will be deactivated when this route comes back into service after an outage Deactivate interface # 4 Click OK The config
Digi 34, 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 detects that 3 consecutive ICMP echo requests have failed, it will take PPP 1 out of service and deactivated thus allowing PPP 4 to come up. The IP address in the firewall rule must be the IP address that PPP 1 is sending pings to. The recovery code will then test the ADSL connection before bringing it back into service. When the recovery is successful and PPP 1 comes back i
Digi 34, 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 start recovery procedures after 10 seconds. This 10 second timer could be increased (by editing the firewall rule) to prevent the Digi Transport from switching rapdily between PPP 1 and PPP 4 in the case where PPP 1 works intermitantly. This “oos 10” can be thought of as a de-bounce timer in the context of this application note. r=ping,
Digi 34, 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 can easily stop responding to ICMP requests (either through the use of a firewall or by physically disconnecting it from the network). You will also need to alter the firewall rule so it monitors the same IP address that PPP 1 is pinging. Once you have the IP address configured and the Digi Transport router is up on the main WAN link, remove your test device from the network or
Digi 34, 12 ppp 4 username "[email protected]" ppp 4 epassword "encrypted" ppp 4 phonenum " 0845 1400101" ppp 4 use_modem 3 ppp 4 aodion 1 ppp 4 pwr_dly 60 ppp 4 autoassert 1 ppp 4 ipsec 1 ppp 4 l1iface "Default" ppp 4 inhibitno "1" ppp 4 inhmode 1 ana 0 anon ON ana 0 l1on ON ana 0 xoton OFF ana 0 lapdon 0 ana 0 lapbon 0 ana 0 logsize 45 4.2 Digi Transport Firmware Versions This is the firmware \ hardware information: Digi TransPort DR6410-HIA DSL2/2+ Router Ser#:60000 Software Build Ver5081. Nov 17 2009 17:49:53
Digi 34, 13 PollANS Revision: 1.2 PPPOE Revision: 1.0 BRIDGE Revision: 1.1 MODEM CC (Option 3G) Revision: 1.4 FLASH Write Revision: 1.2 Command Interpreter Revision: 1.38 SSLCLI Revision: 1.0 OSPF Revision: 1.0 BGP Revision: 1.0 QOS Revision: 1.0 RADIUS Client Revision: 1.0 SSH Server Revision: 1.0 SCP Revision: 1.0 CERT Revision: 1.0 LowPrio
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