On 04-06-08 18:28, Anthony DeRobertis wrote: > On Wed, Jun 04, 2008 at 08:29:21AM -0700, Nelson Minar wrote: >> If you're on an asymmetric link like ADSL there's only so much QoS your >> router can do. In particular if your lodger is downloading lots of big >> files via BitTorrent your incoming connection is going to be saturated >> and your router can't usefully shape incoming traffic.
> <snip> > Data coming from the Internet, on the other hand, winds up queued when > going from the fast 100+ m link to the slower 8m link—that is, on your > ISP's router. Unfortunately, they do not properly prioritize it[1]. Queueing at the ISP is mostly for TCP traffic. You can shape TCP traffic at either side. You can shape your incoming bulk TCP traffic by limiting the number of ACK packets you send back. If you send only one ACK packet back per second, then (after an initial burst) you will only receive one incoming packet per second, which is only 1500byte/s (queued at the sender, waiting for ACKs instead of queueing at your ISP). With a 8Mbit/s line, you can handle 500+ packets of 1500 bytes per second, so limiting at 500 ACK/sec will effectively prevent queueing at your ISP. Of course you can then prioritise the ACK packets based on source or destination port to prioritise your incoming TCP-traffic. Works great on my ADSL :-) > [1] Don't know why none of them have offered this service. "Keep web > browsing fast, even during large downloads!". I _have_ fast web browsing (and good VoIP!), even during large downloads ;-) Arnold _______________________________________________ timekeepers mailing list [email protected] https://fortytwo.ch/mailman/cgi-bin/listinfo/timekeepers
