Mohan Sundaram wrote:
I've my misgivings with this scheme.
What you are doing makes sense only if the number of connections is a
constrained resource. If bandwidth is the constraint, then shaping by
source IP irrespective of number of connections will do the job. As far
as I've seen, routers can support 200k connections and this is
sufficient for many large LANs - say 500 node LAN with 400 connections
per node.
In many cases, the user may not know how many connections he is opening
or which app is consuming connections. Thus, the user may not be in a
position to take remedial action and hence will be at a disadvantage.
In the network in question, bandwidth is minimal (many many users
sharing 512kbps). As a result, unlike in typical networks where
simultaneous connections are statistically insignificant, in this case
one user running many bittorrents can pretty much wipe out network
performance to a ratio of 20 to 1 or more.
The typical response I have seen to this scenario is to try and
prioritise certain protocols over others, but this strategy has the
disadvantage of dictating to the user that they can only use those
certain protocols.
What I would like to do instead is allow the user to use any protocol
they like, with the caveat that attempting to open many connections
simultaneously will result in a steadily decreasing share of the pipe,
rather than a steadily increasing one.
Regards,
Graham
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