Re: [lwip-users] PPP: how to enable the MRU negotiation?

[narke]

On 13 September 2011 14:03, Simon Goldschmidt <address@hidden> wrote:
> I'll try to help, anyway:
>
> Having had a quick look at RFC 1661, it seems like we would always have to 
> support an MRU of 1500 at least (chapter 6.1 in that RFC).
>
> - PPP_MRU is set to 1500, which also is used as the rx/tx buffer size (if I 
> see that correctly).
> - PPP_MAXMRU has been changed from 16384 (pppd) to 1500 (lwIP), but I don't 
> think that's a problem as 2 ppp instances seem to need to actively agree on 
> that to make it happen
> - PPP_MINMRU is still 128
> - PPP_DEFMRU has been changed from 1500 (pppd) to 296 (lwIP).
>
> Now from reading the code, to me it seems as lwIP would send PPP_DEFMRU as 
> the MRU option but go on normally with the connection receiving 
> 1500-byte-sized packets, or am I wrong there?
>
> In any case, you could just add "#define PPP_DEFMRU 1500" to your lwipopts.h 
> and you'd have the original pppd behaviour.
>
> Simon
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Okay, thanks.  I will also read the code and come to you if have some
findings.  Only one thing at the moment:  Where did see the 1500 was
used as rx/tx buffers?

Best Regards,


-- 
Life is the only flaw in an otherwise perfect nonexistence
    -- Schopenhauer

narke
public key at http://subkeys.pgp.net:11371 (address@hidden)