In some email I received from matthew green, sie wrote:
> 
> 
>    
>    Modified Files:
>    	files files.oldconf 
>    Log Message:
>    Now need bpfilter for ppp, since it does packet filtering.
>    Add files for PPP-Deflate packet compression support.
> 
> aieee!!
> 
> my knowledge of the ppp code is very ... minimal, but, why
> do we need to put this in to the pppd when there are several
> packages available that already do packet filtering ?

No, I think what this is about is tcpdump wouldn't attach to a ppp device.
This is a worthwhile change, unless you can construct BPF filters for
compressed PPP data :-)

There was already support for SL/IP, last time I looked.