ISDN CHAP conversion FAQs
What is CHAP?
A: CHAP stands for "Challenge Handshake Authentication Protocol". With CHAP, the authenticator (i.e. the server) sends a randomly generated ``challenge'' string to the client, along with its hostname. The client uses the hostname to look up the appropriate secret, combines it with the challenge, and encrypts the string using a one-way hashing function. The result is returned to the server along with the client's hostname. The server now performs the same computation, and acknowledges the client if it arrives at the same result.
CHAP doesn't only require the client to authenticate itself at startup time, but sends challenges at regular intervals to make sure the client hasn't been replaced by an intruder, for instance by just switching phone lines.
A: Qwest Internet Services is making changes to its network to gain efficiencies and expand the Qwest.net footprint. To accommodate this optimization, the Qwest.net authentication process will be changing.
A: When Qwest switches to the new CHAP-first architecture, customers who use passwords greater than 8 characters will not be able to authenticate for Internet Access. To avoid an interruption of service simply follow our instructions on changing your password.
A: Customers with Cisco 800 series ISDN routers may need to make a configuration change to authenticate using CHAP. The instructions for making that change are as follows:
First make sure you have the ability to access the router. If you can, continue with the steps listed below:
hostname (qwest user name)
ppp chap password (qwest password)
A: Customers with Toshiba ISDN modems may need to make a configuration change to authenticate using CHAP. Please contact your CPE vendor for instructions to make this change.
Legal Notices |
Careers at CenturyLink |
Customers with Disabilities |
Servicio al Cliente en Español | Tariffs