The method list is the defined ways that you will try to authenticate/authorize/account for your users. In the example you list above, your method list contains tacacs+. Since you used the keyword default, this method list will be applied to any ppp connections terminating on this router. If you would have used a name, say dial-up, you would have to manually apply the method list to each interface for the ppp connections.
Sometimes the tacacs+ server is not available and you do not want to just disconnect the user without trying some other way to authenticate the user. The following example will try tacacs+ first, then RADIUS, then local for authentication.
aaa authentication ppp default tacacs+ radius local
If tacacs+ returns a "error" message, it will move to the next method. It will not go to the next method if it returns "fail".
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...