I've a 857 router with an ADSL connection with dynamic IP.
Now I would like to add a 3G connection to my network to increase availability in case of any problem with the ADSL line.
I was asking myself if it was possible to add a 3G router to the network and use BGP to control failover between ADSL and 3G. Of course I've no control to ADSL line such as I've no control to 3G network. ADSL is directly connected to my 857 router and 3G router would be attached to a port of it.