I have 2 locations, one head office and one branch office.
In the head office I have one 1700 series router with an ADSL line and one serial link that connecting to my Branch office. In the Head office we have all the applications and exchange servers are installed and the head office LAN network is 192.168.1.0/24.
The branch office users are using internet via the ADSL line in the Head office.
The LAN network used in my branch office is 192.168.10.0/24
I am not using any dynamic routing protocols in this scenario. Only static routes are in present.
Now I got one ADSL line in the branch office and I configured this ADSL line as the primary internet connection for the users in branch office, and the point to point serial link is only use for the exchange and other applications.
I would like to achieve redundancy for the ADSL line in the branch office as, If the ADSL line in the branch office down, the users should able to use internet through the point to point serial link, using the ADSL line in the head office. (The serial link should also act as the backup for ADSL line)
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