Re: connect ADSL modem
If you want 2 different paths towards the internet (with 'unknown' addresses) you need to have 2 default routes at the same time. You can do that by configuring the second default route to wan5, with the same distance (probably 10) as the first, but with a higher 'priority'. 'Priority' in FortiOS equals 'cost'.
Now you have 2 default routes in the Routing Monitor (check) of which only the cheaper one will be used.
Then, you create a Policy Route, for traffic coming from the VLAN (source address), pointing to wan5.
It might be that you have to enable the GUI part of Policy Route first (System > Features).
Route parameters like distance and priority are set in the CLI.
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