Re: CRC-16 or CRC-32

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On 4/21/2010 5:17 AM, Milan P. Stanic wrote:
> On Wed, 2010-04-21 at 10:10, Jan Just Keijser wrote:
>> the second problem is: if you want to add CRC32 support then you'd
>> have to get it into the linux kernel . that will take *quite* some
>> time (unless you can live with patched linux kernels).
> 
> It wouldn't be so hard to push it to the kernel because Paul Mackerras
> is/was on this list and he is the ppp driver maintainer, I hope ;)

It's a little tricky to implement the feature *well*.  You have to be
able to withstand your peer restarting -- which means that while you're
in CRC-32 mode, you have to be able to accept and process an LCP
Configure-Request frame with a CRC-16 FCS on it -- and you need to be
tolerant of peers that are unable to handle switching -- which means
sending LCP Configure-Request messages with more than one FCS.

-- 
James Carlson         42.703N 71.076W         <carlsonj@xxxxxxxxxxxxxxx>
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