[SWLUG] firewall bandwith shaping

Dave Cridland dave at cridland.net
Thu May 3 09:55:06 UTC 2012

On Thu May  3 10:46:19 2012, Steve Hill wrote:
> But if the ISP won't do traffic shaping, you can do it yourself -  
> your
> router can throw away some of the packets it receives,

Agree with all this, but also, note that there are multiple different  
strategies for throwing away packets.

"RED" - Or Random Early Drop - is a way of dropping packets using a  
more complex algorithm than "the link (or bucket) is full". The  
behaviour is such that the TCP congestion algorithm sees the link  
more gradually become congested, which in turn means that your TCP  
flows will slow down as they approach the limit, instead of banging  
against it and dropping sharply off each time.

RED is several years old, now - I'm sure there's more recent work in  
this space you can use, so it's worth hunting about for more  
up-to-date knowledge than mine.

Dave Cridland - mailto:dave at cridland.net - xmpp:dwd at dave.cridland.net
  - acap://acap.dave.cridland.net/byowner/user/dwd/bookmarks/
  - http://dave.cridland.net/
Infotrope Polymer - ACAP, IMAP, ESMTP, and Lemonade

More information about the Swlug mailing list