l2tpd version 0.60 ================== Copyright (C)1998 Adtran, Inc. Mark Spencer Introduction: ------------- l2tpd is an implementation of the layer two tunneling protocol. It works in userspace completely (although kernel work is planned after the userspace version is stablized). l2tpd works by opening a pseudo-tty for communicating with pppd. Although l2tpd was written for Linux, the current version should be highly portable to other UNIX's supported by pppd. Legal: ------ l2tpd is free software, distributed under the GNU General Public License (GPL) and you should read the LICENSE File if you are not already familiar with the GPL before using the product. If you distribute l2tpd, a modified version, or a derivative product, you MUST not remove Adtran's name from the product nor modify the terms of the copyright. Adtran may license l2tpd under other terms in addition to the GPL. This way, companies who wish to use l2tpd for embedded systems or commercial applications and find the GPL too restrictive can license the technology from Adtran under more favorable terms. Bugs, Patches, and Code Contribution: ------------------------------------- Please send bug reports and patches to either the l2tp mailng list (l2tpd@marko.net) or myself (markster@marko.net). In order to contribute code, either with patches, or by direct access to the CVS tree for l2tpd, send me e-mail (markster@marko.net). The word "FIXME" is a place holder for code that needs to be in place, or checks that need to be done, but haven't been coded yet. Feel free to fix the fixme's and submit patches! Adtran requires that you not restrict the licensing of any patches or code contributions to the main l2tpd project (beyond the terms that are already there). This is to maintain our ability to distribute l2tpd as described above. It does not in any way affect your ability to use code that you have written. Of course, the above patch rules apply only to the "official" l2tpd product as distributed by Adtran. If you are unwilling to give Adtran the right to re-license your patches under other terms than GPL, you may create your own third party product which is distributed only under GPL. Release Notes ------------- Version 0.60 should be considered ALPHA. It does NOT completely implement the l2tp draft specification. Work on the high-speed kernel implementation has already begun, but a relase date is not available. The primary use of this ALPHA level code is to test the ability of l2tpd to talk with other LAC and LNS implementations. I hope that everyone who tests the software will send me results on how it worked or failed to work for them. (theoretically) implemented features ------------------------------------ * Proper payload and control packet handling * Reliable control packet delivery * Ability to recover from payload errors * Ability to handle packets with/without length set * Ability to handle flow control or no flow control * Most critical AVP's for normal operation * Challenge authentication * Hidden AVP's * Hello's to detect outages * Handles sync and async packets * Can act as LNS * Can be a source of a virtual LAC call * Reads configuration file * Automated LAC dialup via config file, including redial * Can be configured while running via a file system pipe * Access Control * Statistics report when sent a SIGUSR1 * ACCM Major unimplemented specification features ------------------------------------------ * Rate Adaptive Timeouts * Out of order packet handling * Initial/Final LCP states * Q.931 Result Codes * Tie Breakers * Minimum/Maximum BPS * Call Errors Important non-specification related features to be added -------------------------------------------------------- * More configuration options if needed * Kernel support for *much* improved performance Usage notes on /var/run/l2tp-control ------------------------------------ There aren't any command line options to l2tpd yet. Upon running l2tpd, a pipe is created in /var/run/l2tp-control. Simple commands can then be echoed to this pipe to control l2tp on the fly. The commands are: t - create a tunnel to c or - originate an l2tp call on the tunnel identified locally by , or dial the entry h - hang up a call with the local identifier d or - disconnect the tunnel locally identified by or a lac entry For example, to establish a tunnel to marko.net, one might do: echo "t marko.net" >/var/run/l2tp-control l2tpd must be running for this to work. Various other notes ------------------- The PPP options are hard coded in l2tp.h until a file format is decided upon. Sending a SIGUSR1 to l2tpd will cause it to dump its status. Mailing List ------------ If you would like to contribute to discussions of the architecture of l2tpd, file formats, etc, I encourage you to join the l2tpd mailing list by sending the word "subscribe" in the body of a message to "l2tpd-request@marko.net"