From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Mackerras Subject: Re: [PATCH] ppp: allow disabling multilink protocol ID compression Date: Wed, 22 Dec 2010 09:44:00 +1100 Message-ID: <20101221224400.GA17383@brick.ozlabs.ibm.com> References: <20101220195833.26786ec5@nehalam> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-ppp@vger.kernel.org, netdev@vger.kernel.org To: Stephen Hemminger Return-path: Received: from ozlabs.org ([203.10.76.45]:51432 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753522Ab0LUWoK (ORCPT ); Tue, 21 Dec 2010 17:44:10 -0500 Content-Disposition: inline In-Reply-To: <20101220195833.26786ec5@nehalam> Sender: netdev-owner@vger.kernel.org List-ID: On Mon, Dec 20, 2010 at 07:58:33PM -0800, Stephen Hemminger wrote: > Linux would not connect to other router running old version Cisco IOS (12.0). > This is most likely a bug in that version of IOS, since it is fixed > in later versions. As a workaround this patch allows a module parameter > to be set to disable compressing the protocol ID. > > See: https://bugzilla.vyatta.com/show_bug.cgi?id=3979 > > RFC 1990 allows an implementation to formulate MP fragments as if protocol > compression had been negotiated. This allows us to always send compressed > protocol IDs. But some implementations don't accept MP fragments with > compressed protocol IDs. This parameter allows us to interoperate with > them. The default value of the configurable parameter is the same as the > current behavior: protocol compression is enabled. If protocol compression > is disabled we will not send compressed protocol IDs. > > This is based on an earlier patch by Bob Gilligan (using a sysctl). > Module parameter is writable to allow for enabling even if ppp > is already loaded for other uses. > > Signed-off-by: Stephen Hemminger Acked-by: Paul Mackerras