I am searching on the net about this problem so i found this statement. Is the last sentence of this paragraph is true.
All default passwords on a Cisco router are blank. It is not possible to telnet to a router without the "line vty" password established you will get
a "Password required, but none set" notice. Additionally enable mode cannot be reached over telnet if the "enable password" has not been configured again you will get a "% No password set" prompt. "At the console these limitations do not exist so blank passwords will allow access".
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
Go to Help > About and check the current version:
Check the current version availa...
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...