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Digi 34 manual

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Table of contents for the manual

  • Page 1

    1 Application Note 34 Configuring ADSL to back up to PSTN/I SDN with automatic testing a nd recovery back to AD SL. UK Support 29 December 2009[...]

  • Page 2

    2 Contents 1 Introductio n ............................................................................................................................................... 2 1.1 Outline ............................................................................................................................................... 2 1.2 Assumptions ...[...]

  • Page 3

    3 Configuration: This Applic ation Note assume s t hat the Digi Transp ort router is already c onfigured with a worki ng ADSL connection through PPP 1 . 1.3 Corrections Requests for cor re ctions or amendment s to this applicat i on not e are welcome an d sho uld be addressed to: uksupport@digi. com Requests for new a pplication notes ca n be sent [...]

  • Page 4

    4 2 CONFIGURA TION 2.1 Configure PPP 1 (ADSL) This PPP interface sho uld already be conf igured for use with the I SP. You shoul d confirm that you hav e a working ADSL con ne ction before pro ceeding with this conf iguration. The PPP 1 interface needs to be conf igu red to be “always on”. The inactivity timer should be set to 0. Configuration [...]

  • Page 5

    5 Click OK[...]

  • Page 6

    6 2.2 Configure PPP 4 ( PST N ) It will be necessary t o configure PPP 4 a s an out bound interface as the default is f or t he interface to accept incoming calls. Then ISP configuration wil l be ad ded. Navigate to the fol l owi ng location: Configuration - Inte rfaces > PPP > PPP 0 - 4 > PPP 4 > Standard Scroll to the bot t om of the [...]

  • Page 7

    7 Click OK Configuration - Inte rfaces > PPP > PPP 0 - 4 > PPP 4 > Advanced The PSTN interface nee ds to be configured so t hat if PPP 1 (ADSL) is up and in s erv ice (i.e. passi ng dat a) then this interface is n ot allowed to init i at e a connection. Parameter S etting Descript ion Inhibit auto - act ivation when these PPPs are activ[...]

  • Page 8

    8 Click OK 2.3 Configure the Default Routes It is necessary t o configure two default routes, on e for PPP 1 and one f or PPP 4 . The PPP 1 default rout e needs to be set so PP P 4 i s dea ctivated when PPP 1 returns to service af ter a successful rec overy. Configuration - Rou ti ng > Defaul t Route 0 Parameter S etting Descript ion Interface P[...]

  • Page 9

    9 Click OK 2.4 Configure the Firewall The firewall should be configured t o m on itor the ICMP request s generated by PPP 1. If the firewall detect s that 3 consecut i v e ICMP echo request s hav e f ailed, it will take PP P 1 out of service and deactiv at ed thus allow ing PPP 4 to come up. The IP address in the f irewall rule must be t he IP addr[...]

  • Page 10

    10 inspect - state – monitor the pi ng s for echo replies and al l ow them back in oos 10 t= 3 c= 3 d= 3 – if 3 consec u tive pings fail, deacti v ate PPP 1 and start recovery procedure s af t er 10 seconds . This 10 second timer coul d be increased (b y edit i ng t he firewall rule) to prev e nt the Digi Trans port from switching rapdily bet w[...]

  • Page 11

    11 3 TES TING 3.1 Simulate a f ailure To test the fail ov er and r ecovery you will need t o configure the PPP interface to ping a I P address that you can easily stop respon ding to ICMP requ ests (either through the us e of a firewall or by phy sically disconnecting it from the network). Y ou will also need to al t er the firewall rule so it moni[...]

  • Page 12

    12 ppp 4 username "user@isp.com " 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 [...]

  • Page 13

    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 Revision: 1.0 [...]