[GLLUG] Avoid Virgin Media

James Courtier-Dutton james.dutton at gmail.com
Mon Dec 24 00:13:17 UTC 2012

On Dec 21, 2012 8:38 PM, "Nix" <nix at esperi.org.uk> wrote:
> On 21 Dec 2012, John Edwards spake thusly:
> > One client had a leased line, 10 Mbit/s on a 100 Mbit/s fibre.
> > Pretty standard, except that instead having their routers queue
> > the traffic over 10 Mbit/s they dropped the packets instead.
> Er, isn't that exactly what you're supposed to do in TCP/IP as a
> congestion indicator? Queueing packets when you get congested is bad,
> bad, bad.

Well a router is supposed to inform the sender when it drops packets. A
icmp congestion notifications should be used.
ECN is also used.
Queuing packets for very short periods is ok, but if a queue gets full,
dropping the entire queue is normally the best rule.
The dropping of packets over 10meg is better than Queuing them. Supporting
ECN is better.
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