Re: [PATCH] ppp: allow disabling multilink protocol ID compression

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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 <shemminger@xxxxxxxxxx>

Acked-by: Paul Mackerras <paulus@xxxxxxxxx>
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