Re: [PATCH next-next] ppp: change default for incoming protocol filter to NPMODE_DROP
From: Benjamin LaHaise <bcrl@xxxxxxxxx>
Date: Tue, 3 Jul 2012 21:32:58 -0400
> By default, the ppp_generic code initializes the npmode array that filters
> incoming packet to accept packets for all protocols. This behaviour is
> incorrect, as it results in packets for protocols that an older version
> of a PPP implementation may not be aware of to be incorrectly accepted.
> This behaviour is visible, for example, when sending IPv6 packets across a
> ppp link where pppd has only been configured to use IPv4.
>
> This change should be safe since pppd will correctly set the protocols it
> negotiates to NPMODE_PASS as the appropriate protocols transition to an Up
> state.
>
> Signed-off-by: Benjamin LaHaise <bcrl@xxxxxxxxx>
As far as I can tell, this has been this way for a very long time.
Therefore it is the applications responsibility to adjust the filters
to suit their needs and we really can't make such adjustments to this
behavior.
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