Thanks,
I plan to use the ppp stack in the linux as a dial-up server. The
compression is used between
the dial-up server and the dial-up modems, not in the WAN.
The Microsoft Point-to-Point compression (MPPC) is mentioned in the CCP (RFC
1962). The
reason I implement it is to support Windows 95/98/NT platform. Are you
saying that
Stac-LZS and Predictor compression are supported on those platfroms too ?
How about
MPPC ? When you enable the software compression in the dial-up networking in
those
platform, actually what kind of compression it will use. I enable the debug
option in the
pppd and found out that MPPC (CCP option 12), BSD (option 21, bsd_comp.c)
and MVRCA (type 24)
and Deflat (type 26) are negotiated. Somehow the negotiation failed and ppp
can not
support Windows platform compression for now unless I did it wrong.
I know that Cisco router support MPPC too.
James
> -----Original Message-----
> From: Jan Kratochvil [SMTP:[EMAIL PROTECTED]]
> Sent: Tuesday, April 06, 1999 10:37 AM
> To: James Yu
> Cc: [EMAIL PROTECTED]
> Subject: Re: Microsoft compression for PPP on Linux
>
> > Does any one know how any implementation doing Microsoft compression for
> > PPP on Linux ? Or any idea ? I am thinking about to change the pppd and
> ppp
>
> What do you mean by protocol "Microsoft compression for PPP"?
> But back to the compression thread some time ago here - the only two
> compression protocols implemented in Cisco routers, the vast majority
> of terminal at ISPs, are:
>
> 1) Stac-LZS [RFC 1974]
> 2) Predictor compression [RFC 1978]
>
> Stac-LZS is also implemented in M$ W*s but unfortunately (as I have been
> told by some kind soul from the list) the algorithm's license doesn't
> comply
> with GPL (GNU General Public License) and probably with OpenSource
> generally.
>
> But Predictor can surely be implemented, can't it? I know that it can't
> achieve superior compression ratios but better this than nothing. Isn't
> someone
> already working on it? There are even C-language examples in the RFC and
> the compression/decompression isn't much complex so it would be easily
> doable
> (with help of bsd_comp/deflate skeleton), I think.
>
> > stack in the kernel. The version of the ppp I have is 2.3.5. I wonder if
> > there is
> > newer feature in the 2.3.7 that I might help me achieve this.
>
> I don't know any compression-related changes in 2.3.5-2.3.7 but the
> upgrade
> is worth it anyway.
>
> > James
> Bye, Lace
>
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