openbsd-ports/net/pptp/pkg/MESSAGE
naddy f6b6062096 * Update maintainer email address.
* Add detailed option descriptions to pptp(8) man page.
* Move OpenBSD configuration examples from text file
  ${PREFIX}/share/doc/pptp/USING into pptp(8) man page,
  and remove patch to ${WRKSRC}/USING. Extend and
  revise examples while at it.
* Add patch to ${WRKSRC}/util.c to make pptp log normal
  informational messages with level LOG_INFO instead of LOG_NOTICE.
* Update pkg/DESCR with a new description based on upstream web site.
* Fix URL to list of pptp security flaws in pkg/MESSAGE.
* [Re-]Create patches with `make update-patches'.
* Add patch to ${WRKSRC}/pptp_gre.c to automatically enable
  the net.inet.gre.allow sysctl before trying to bind
  the GRE socket.
* Remove '@sysctl net.inet.gre.allow=1' from PLIST.

From: maintainer Stefan Sperling
2007-10-23 22:13:38 +00:00

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You will need to allow gre traffic for pptp to work:
sysctl net.inet.gre.allow=1
pptp will automatically try to set this sysctl before opening a gre socket.
See http://www.schneier.com/pptp-faq.html for a list of security flaws.
==========================================================================
ATTENTION:
Alcatel ADSL modems contain default logins with easily computed passwords.
See http://security.sdsc.edu/self-help/alcatel/ for more information.
==========================================================================
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).