RE: [LARTC] Intelligent P2P detection

["Robert Kryczalo" <robert.kryczalo@iscnet.pl>]

Hi,

> -----Original Message-----
> From: lartc-admin@mailman.ds9a.nl
> [mailto:lartc-admin@mailman.ds9a.nl]On Behalf Of Dawid Kuroczko
> Sent: Wednesday, March 26, 2003 10:37 PM
> To: Luman
> Cc: lartc@mailman.ds9a.nl
> Subject: Re: [LARTC] Intelligent P2P detection
>
>
> On Tue, 25 Mar 2003, Luman wrote:
>
> > I need this solution not only to prioritizing the traffic (prioritizing
> > can be achieve in other way) but also to selection the Internet link. I
> > want to NAT this low quality data for some specific address in order to
> > send it over cheaper link.
>
> I do not know if it might help you, but here's my "temporary hack quality"
> solution.
>
> Assumptions:
>   Determine and mark 'good traffic' -- i.e. smtp, ftp, http, ssh, etc.,
>   everything which uses well known ports.  Probably most people do it
>   anyway, at least to some level.
Yes. I do it exactly the same way. Quota patch may be of some help, if we
want to limit more agressive users. Time patch is also of some use.
>
>   All what is left are P2P connections and some other misc connections.
>   A bit unfair for other protocol using non-standard ports, like Instant
>   Messenger style-software, and lots of other stuff.  So here we introduce
>   a trick.  IMs and other low bandwidth traffic will use small packets
>   ( < 512 or even < 256), P2P will use maximum MTA available (usually
>   1500, but I've seen some using 576 packets, hence i treat > 512 as P2P).

Prioitizing small TCP packets carying ACK's, SYN's and small payloads is
also a very good idea. Some other trick include prioritizing UDP and ICMP
packets (sometimes with more strict policy, like limiting packets/s or their
sizes). I didn't dive deeper because I was worried about CPU usage.

I use a mix of methods described above. But in some cases shaping systems
like dyband are better. I am looking for a free alternative.


RK

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