firstly,
you will need 3 loopback ip.
1 as tunnel source referral to tunnel 1
2 as tunnel source referral to tunnel 2
3 loopback ip for ISDN usage
keepalive command must be put in the tunnel interface
this will trigger the backup command if the tunnel fails.
note that loopback interface...
Yes.
Setup the ADSL as a second tunnel.Put keepalive command for both Tunnel(T1&ADSL).You will have to put a backup command for T1 using ADSL connection, another backup command for ADSL using ISDN.
should solve all your problem here.
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