From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jean Lee Date: Tue, 11 Jan 2005 07:49:19 +0000 Subject: Re: PPP features ? Message-Id: <41E384FF.30707@free.fr> List-Id: References: <41E262D3.8020303@free.fr> In-Reply-To: <41E262D3.8020303@free.fr> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ppp@vger.kernel.org Hello James, Thank you very much for your answer. For the patents in France, I think it is like what you said so I will forgot LZS For the NCP protocol, I am not sure but I think that it is IPCP + IP header compression + software compression (LZS) + CCP because it is wrotten like this : /Network Control Protocol (NCP), for the PPP protocol integration control in the IPv4 layer :/ /- protocol IPC management (Internet Protocol Control)/ I think that there is a mistake and that he want to speek about IPCP because I don't know IPC. /- IP header compression support/ /- software compression support (LZS) optional./ / - Compression Control Protocol (CCP)/ Does it have a meaning ? Is there another software compression protocol than LZS which is available ? Where did you find all this information ? Regards, Jean Lee James Carlson wrote: >Jean Lee writes: > > >>In order to write my own application, I would like to know where I can >>find information on the ppp stack features for linux 2.4.27. Does >>anybody know it ? >> >>In particular, does the linux ppp stack implements the following >>protocols ? : >>PAP, IPCP >> >> > >Yes to both. > > > >>IP header compression >> >> > >It has VJ (RFC 1144) header compression, but nobody has worked on the >newer patent-laden ROHC things. > > > >>, CCP >> >> > >Yes. > > > >>, LZS >> >> > >No, not by default. It's patent-encumbered. There are patches >floating around the 'net that reportedly add this. Use at your own >risk. > >(Patents aren't like copyrights, at least in much of the world. You >can get sued successfully even if you write the darned thing from >scratch. You can even get sued if you happened to invent it on your >own purely by accident. Not sure about the situation in France ...) > > > >>and NCP >> >> > >That's not really a protocol. The "NCPs" in PPP are the network >control protocols. One of these is IPCP, the Internet Protocol >Control Protocol, which is used to negotiate IP parameters. > >Or are you asking about IPX support? (One of the IPX-related >protocols is also called "NCP.") > > >