See http://www.counterpane.com/pptp.html for a list of security flaws.

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ATTENTION:
Alcatel ADSL modems contain default logins with easily computed passwords.
See http://security.sdsc.edu/self-help/alcatel/ for more information.
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You may want to use TCP/IP packet filter rules to prevent unauthorized
access to your modem (from internal net or spoofed/bounced TCP/IP packets).
